I have seen the same issue in phones the flash light always on the problem was a shorted cap on the charging ic line the pin name was (FLASH ENABLE) Or in this case there's a problem with one of the resistances because when you touch the board the value is changing
In BIOS is the keyboard backlight set to constantly ‘On’ ? Auto ALS and Input - The keyboard automatically illuminates in dim lighting - Maybe same circuit. Google states because of some setting on BIOS. Open your HP BIOS and go to the Advanced Settings tap. If there's a Built-in Device Options menu there, you will find keyboard settings under it that allow you to set your backlit keyboard to always on. So it could be just a BIOS setting which means the keyboard backlight is constantly set to on.
Hello Sorin. This happened to me about 3 times, with different laptops. It seems to be a failure in the EC internal switching (transistor or logic). There must be almost a resistor between this pin 2 in the flat cable and the EC. When you apply your body, you are applying a capacity between the pin and ground; so, as the logic out of the EC is almost bad, it reacts to your capacity. Instead of a resistor, like you said in the video, you can avoid change of the EC installing a 0.1uF cap between the faulty line and ground. Try this.
that LED is PWM controlled by something since it "breathes" when the laptop is in sleep. It might be ic chip that is partually open or chip on the button pcb. and when touched you pull dow power enough so it turns off.
I'd hazard a guess that a pull-down resistor has gone open circuit, either on the button board or the motherboard, so a transistor gate is now floating and anything can cause it to go off/come on (touch, temperature)......I'm curious if replacing the button board would fix it, although I'm not sure where you'd find one.....
Hi Sorin, this is a issue reported with some HP laptops and it is not a hardware issue, the problem is related to the Intel MEI driver, so if you want to power off that led, you need to try this: 1. Update BIOS and reinstall the Intel MEI from HP web (works 80% times); this problem occurs if you have older BIOS and you install the update version of Intel MEI driver then the system becomes unstable and generates these kinds of wrong behaviors. and if the BIOS update doesn't work, just do this: (before do this, verify that you have Intel MEI installed) - Go to Device Manager - System Devices -> find Intel Management Engine Interface - Right Click properties. - Power Management tab - Untick option "Allow computer to turn off this device to save power" and voila, light turns off when you shutdown the laptop.
believe it or not this fault is mentioned on the HP website - its a setting in the power management settings to turn off the power light I posted the link earlier but the Utube mods must have removed it...
26:41 some type of transistors have sensitive gates, which you can activate using your finger, and you know that. So maybe in rare case, the typical transistor can get fault and start to behave like touch sensitive type. So trace and find transistor which is related to that diodes and check it - maybe it is bad, or looks like a good one, but its gate is flow/leaks to source, or maybe there is damaged capacitor or resistor connected to that gate. Too bad that you didn't even measure from where, that LEDs are taking the voltage.
1.The extra brightness makes me check the voltage on the ground and LED wires. Or maybe the LED supply is supposed to be pulsed. I like the idea already suggested by earlier to power the LED from the keyboard backlight. Or use an optocoupler in line with the power LED to control it with the keyboard backlight 2. Floating data line from the button. Add 1K pull-up resistor. 3. Final guess 😁 Treat those areas of liquid damage with Kolofonium flux. I like this one best
(14:03) What's the point? Master Sorin, I liked this answer I read on a forum: when the Front Display Panel moves against the palm rest, the laptop closes (the led should go off) and so the hinges (a very common critical point of failure) It does NOT make any effort or is reduced to the minimum. Another way of saying it, the hall sensor and other technical explanations I leave aside for the moment, as I prefer to always have a hardware problem I would just replace the small 6050A3038301 module and if the fault continues then I seek advice from software experts. All the best
Hello Sorin, 1 - take out the ribbon cable 2 - deep clean everything with isopropyl alcohol 3 - reflow all solders 4 - have you tried to close the cover ? Maybe the hall sensor is shutting down the LED and with the cover open, it is shutting down after some time.
I've had the same laptop and the only thing I could say is that those LEDs are supposed to be ON only while the laptop is ON and there are no touch sensors there. It's just a mechanical button. Touching with your finger is shorting something elsewhere or changing the potential. I'm pretty sure that if you short it and turn on the laptop the LEDs will stay off.
It could be that that light is going on when the "hibernate mode" in Energy Options is activate? In standard Option it is activate but with M2 or SSD drive that is not longer needed. Try to deactivate. That's just a guess.
Can it be an anti-tamper warning? Maybe the backcover was tightened enough, the screws or a metallic back cover could change the resistance on a hall effect sensor and make it turno off when the back cover is correctly positioned.
Sorin the power button is pressed on always its faulty .. remmber when you put back the battery and the laptop was on without pressing the power button you should check that button with resistance ... it also explain why the laptop needed a reset in the first place
That led is supposed to flash if the laptop is in suspend or hibernation mode, so in that case it is intermittedly pulled to ground from the sio chip which is software controlled. In linux it's controlled from the kernel and in windows from the intel ME, which you can set in the device manager! Nice video for LOL...:-)
13:10 - Example how faulty component change characteristics based on temperature (in this case return to normal function when heated enough). You were not touching it with your hands. Or that pcb has broken track, and when you heat it, PCB bend it self, as expands and make contact to tell to motherboard to stop lightning signal. Another example can be vibration, when you hit component with plastic pen, it starts working. 17:56 - You can try tweezers with ceramic tip, they isolate you from circuit. Our body has capacitance and you were probably not grounded. What can happen is that this is only place to manifest problem, but actually can be somewhere on motherboard. Check signals on connector where that flat cable goes on motherboard. Maybe motherboard wants to turn LED on, at all times, maybe its not button at all. 21:00 - Its not light sensor, it cheated you, when you look in side, it turns on, then you bring light. 25:09 - You can find schematics of chips on that small pcb, online, and see what they are for. 27:55 - When if you short signal that is turning LED on, to GND, it will go OFF because voltage goes to ground directly.
I do not think is supposed to work like that, I seccond the opinion that it must be about a pull-up resistor missing/defective. I do not think there is a hall sensor on the tiny board since when lid is closed the LCD screen itself would be about the hall sensor and that is not magnetic. Hall sensors are built usually on the top side of the lid and engage with a magnet in the palmrest.
Maybe somme hight impedance rezistor is commanding the led. When you touch it is activate the light, and the rezidues on board it is modified the interval rezistance ...
I saw something like that on fingerprint sensor... i received a laptop that for liquid damage on power button ( + fingerprint ) it was identifing the liquid damage as a finger on it... lighting the button ( checking fingerprint ) .. o my case when windows is loaded touching the button make a red light ( not accepted fingerprint ) and i didcovered rhe issue.. ( replaced the fingerprint button entirely )
Gate of transistor to turn on leds not connected to anything and finger is coupling AC from air onto gate and turn off transistor. Something is open circuit that control that led. Could be the iochip at the mainboard components if not on that small little board. Biggest mistake is that it is HP.
Hi Sorin, it seems to me a short somewhere either on the ribbon cable or in the ribbon cable connectors, I would check the the tracks on the ribbon cable. It is possible that the 3.3v reference going to the power button is shorting out on the LED track but the voltage is not being dropped enough to trigger a notebook shutdown or power on like pressing the button. This can happen with LEDs as they need very low voltage to turn on. Cheers!
Some TV'S I have owned have an always on power indicator to help find the power button in the dark. They can be disabled in the settings. Perhaps that HP laptop has a similar feature which can be disabled in the BIOS? Otherwise, it's a fault.
This happened with an Asus, because I removed the Azureware wifi card, and replaced it with an Intel compatible from a Siemens. When I put it back, it went back to normal. It also required an Asus windows dvd, pops out the tray to put in the original dvd.
since looks like a fresh windows install i would say its fast boot issue. disable it from windows energy options. i've seen this issue before related to system power states. the laptop appears to be off (s5) but its actually on s4 state (fast startup).
I replaced the power board and flex cable on mine, the issue with mine was kinda similar, it will light up when ever it wanted too, not touch sensitive or heat sensitive though.
maybe its a light sensor, if its normal. the light is on when you open the laptop to easily find the power button, and it will work when the place is dark, and the sensor maybe place on the keyboard or touch pad area.. now I'm thinking what other say, this issues starts when the owner install the wrong drivers,. so the sensor goes sensitive and malfunctioning, even a tiny hot radiation it will switch.
Is it a sensor that is meant to light up when you open the laptop LID, and it turns off when you close the laptop LID? But in this case it's faulty and it's not turning off when the laptop lid is closed. Interesting observation when you touch with your finger (your body has a small voltage which is how touch screens work on phones), that small voltage is exciting the connector pin 1 & 2 together :D What doesn't make any sense is the heat gun is exciting the connector also... Unless the movement of hot air is enough to move / bend the cable and the connector in some way... crazy.
Put a magnet close to the hall sensor and see if it turns off. Maybe if there is a magnet in the screen it could have come loose and shifted? Just an idea. No clue on this one really. If that is a hall sensor, maybe the hall sensor is bad?
might be a flex-cable (contact-port) issue ...I'd try to resolder some points and also check, if there is a faulty (pull-up/pull-down) resistor as everything is so touch-sensitive (noise)
I have encountered lots of problems like this. And not only with laptops. Everytime the solder looks good and shiny but is sticking only by the components legs. Heating and pulling by components is the only way. They go off before solder melt to uncover oxidated pads with no trace of solder on them - just oxidated copper - components being lifted with the solder on the original shape on their legs. Is a 'miracle' that i usually discover on cheap electronics, but now it appears on nice laptops too. Is more tragic when a battery BMS with balance function actually in unbalancing the cells because it gets the measurements wrong and is still letting you to charge the battery and use it 🤦. Quality in electronics is not what it used to be.
Maybe it's like a fridge, on until the lid is shut - lol -. The owner would know it's unusual, ie, a fault, because he uses it all the time. It looks capacitive, because metal or anything close triggers it.
Looks like Floating pin that should be grounded through a pull down resistor to work. Try touching it while laptop is powered on if it did not work then probably it is a failed resistor if it did switch off then you are just shorting a pin to ground and has nothing to do with the fault
The purpose of that light is to drive you crazy. It's the everything is OK light. Seriously though I think maybe a capacitor on the mini-PCB has gone open circuit (or a resistor) and introducing your finger is somehow acting as that faulty component and turning the light off. The only way to know for sure is if somebody else has this exact model of HP. I'd try defaulting the BIOS, as you have and then maybe try updating the BIOS or power management firmware in Windows maybe ACPI or management engine, those sort of drivers. Another thing to try is taking the SSD out and powering it on and off to see if it still does it. If it still stays on then it's probably the system BIOS/UEFI (if it's not a hardware fault).
Open Settings and select System. Select Power and sleep, then click on Additional power settings - in the following window, click on 'Choose what the power button does' in the left-hand pane. In the subsequent window, first, click on 'Change settings that are currently unavailable' ( near the top of the Window ) and then remove the checkmark from the box against 'Turn on fast start-up (recommended)'. Click the Save Settings button, then close any open windows and shut down the notebook by right click the Start Menu icon, select Command Prompt (Admin) and click ‘Yes’ to the UAC prompt. Type ( or copy and paste ) in the following command ( including spaces ) and hit enter - shutdown /s /t 0 Start the notebook and let Windows fully load for a couple of minutes before checking if it will now shut down correctly from the Start Menu.
It is most likely a Windows setting in Power Options and option to change behaviour of the power button. In the state you have, the power led on all the time is indicating hibernation mode. To get back is usually a press of say, the Esc key or other keyboard key top wake it up. In hibernation mode, power is always on but just enough to keep RAM alive etc for anything stored in it as it is Volatile Memory. Hence, power led always on even though you press the actual laptop power button. IF the power button behaviour is set to hibernate, it will NEVER shutdown even though many may think it would. The behaviour has been changed from shutdown to hibernate. IF the power button is set to Hibernate in power options in Windows, this may leave the power led always on as in principal, the laptop IS on in hibernation mode as it needs power to keep items in RAM for when it starts back up. Simple answer to check? windows power options advanced view to see the power button behaviour. It is possible for sleep too so nothing wrong with the laptop, just simple user error. IF the power button is set to hibernate in advanced power options then this simply explains the behaviour of the power led always on. The system is overridden by the OS. NOT a hardware issue but an OS and user issue I am afraid, most of the time. This is usually the problem. This has been a setting for a very long time and does actually produce this behaviour on many laptops. From slow blinking power led to solid power led light. IF you mess with the electronics in this situation you can actually create a problem when there was none. Not all power button iss8ues will be from hardware issues. type in search (usually on taskbar) Control Panel change the view from category (right hand side and up a bit. (view by category)) change to a size of icons you want select Power Options on the left you should see several options, click on Choose what the power buttons do Power is usually the option for shutdown (When I press the power button: Shutdown) if this is set to hibernate then that is all the power button will ever do leaving a power led on all the time. this option means hibernate doesn't have to be a power option, just clicking the power button on the laptop will put it into hibernate. If the following is the end result: search on taskbar->Control Panel->if in Category mode change to icons->Power Options->Choose what the power buttons do->when I press the power button: Hibernate then change the last to shutdown so like below: search on taskbar->Control Panel->if in Category mode change to icons->Power Options->Choose what the power buttons do->when I press the power button: Shutdown
nice one.,.. but the problem at hand cannot be solved by those settings..... the laptop was clearly shutdown and the problem persisted.... its either the ribbon cable or defective on switch panel
Could I be the sensor for the lid? Over sensitive so when something electronic moves near it it changes? Shorted resistor?? It would make sense that the power button lite when the lid opened and off when closed?
id read the models user manual to first understand how the led is meant to function and then take it from there.. once I know what to expect from the led behaviour.
Because it is actually hibernating so that the next boot is very fast. It will turn off completely after it finishes. turn off hibernation from windows setting or check BIOS settings.
this is a hp 840 g5 I have so many laptops in my shop like 10-15 and 2 for repair I'm sure this is not a feature. This a power button problem. just replace with a good button or just make an on/off and GND jumper motherboard to the power button.
Maybe it previously had an intermittent fault on the little daughter board. Something like it was bent before originally being fitted. Then like a lot of users they started to apply more and more pressure to the button when it wasn't behaving correctly causing more damage to the board. Like cracked inside the board layers. Its funny to watch you finding all the different interactions triggering it though 😆
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OMG!!!! I haven't laughed so hard in a while from a repair. This was pretty wild Sorin !
The hot air gun on the switch killed me 😂😂
I would say it's a defective flex cable. Heat might move it to the point it makes a contact.
I think there is a missing pull down/up resistor
Since its kinda touch sensitive
I have seen the same issue in phones the flash light always on the problem was a shorted cap on the charging ic line the pin name was (FLASH ENABLE)
Or in this case there's a problem with one of the resistances because when you touch the board the value is changing
In BIOS is the keyboard backlight set to constantly ‘On’ ?
Auto ALS and Input - The keyboard automatically illuminates in dim lighting - Maybe same circuit.
Google states because of some setting on BIOS.
Open your HP BIOS and go to the Advanced Settings tap. If there's a Built-in Device Options menu there, you will find keyboard settings under it that allow you to set your backlit keyboard to always on.
So it could be just a BIOS setting which means the keyboard backlight is constantly set to on.
I shall ask my wife about the thingy. She is also sensitive to warmth, light, sound, touching, snoring and other forms of air displacement... 😅
Hahaaa maybe i should ask mine, same mood
@@electronicsrepairschool 🤭
@@electronicsrepairschool 🤣🤣🤣🤣
if I dare to ask mine I run the risk of having her breath taken away
@@electronicsrepairschool 😂😂
Hello Sorin. This happened to me about 3 times, with different laptops. It seems to be a failure in the EC internal switching (transistor or logic). There must be almost a resistor between this pin 2 in the flat cable and the EC. When you apply your body, you are applying a capacity between the pin and ground; so, as the logic out of the EC is almost bad, it reacts to your capacity. Instead of a resistor, like you said in the video, you can avoid change of the EC installing a 0.1uF cap between the faulty line and ground. Try this.
that LED is PWM controlled by something since it "breathes" when the laptop is in sleep. It might be ic chip that is partually open or chip on the button pcb. and when touched you pull dow power enough so it turns off.
Hi sorin, I faced laptop with a problem like this and it is HP also . It can be controlled ON or OFF in the setting of the windows. Try it out .
I'd hazard a guess that a pull-down resistor has gone open circuit, either on the button board or the motherboard, so a transistor gate is now floating and anything can cause it to go off/come on (touch, temperature)......I'm curious if replacing the button board would fix it, although I'm not sure where you'd find one.....
The customer already replaced the power button board, but i found out after the video. Indeed, it is a floating gate :D
Hi Sorin, this is a issue reported with some HP laptops and it is not a hardware issue, the problem is related to the Intel MEI driver, so if you want to power off that led, you need to try this:
1. Update BIOS and reinstall the Intel MEI from HP web (works 80% times); this problem occurs if you have older BIOS and you install the update version of Intel MEI driver then the system becomes unstable and generates these kinds of wrong behaviors.
and if the BIOS update doesn't work, just do this: (before do this, verify that you have Intel MEI installed)
- Go to Device Manager
- System Devices -> find Intel Management Engine Interface
- Right Click properties.
- Power Management tab
- Untick option "Allow computer to turn off this device to save power"
and voila, light turns off when you shutdown the laptop.
believe it or not this fault is mentioned on the HP website - its a setting in the power management settings to turn off the power light I posted the link earlier but the Utube mods must have removed it...
Thats an interesting fault.
LoL, welcome to my life Sorin. Usually its something super simple and I'm over thinking things.
26:41 some type of transistors have sensitive gates, which you can activate using your finger, and you know that.
So maybe in rare case, the typical transistor can get fault and start to behave like touch sensitive type. So trace and find transistor which is related to that diodes and check it - maybe it is bad, or looks like a good one, but its gate is flow/leaks to source, or maybe there is damaged capacitor or resistor connected to that gate. Too bad that you didn't even measure from where, that LEDs are taking the voltage.
1.The extra brightness makes me check the voltage on the ground and LED wires. Or maybe the LED supply is supposed to be pulsed. I like the idea already suggested by earlier to power the LED from the keyboard backlight. Or use an optocoupler in line with the power LED to control it with the keyboard backlight
2. Floating data line from the button. Add 1K pull-up resistor.
3. Final guess 😁 Treat those areas of liquid damage with Kolofonium flux. I like this one best
This was a funny repair video took me some time but I think I'm getting use to your humor lol.
Hello
Sorin You should check ground and everyone pin .
No ground on module or resistor fail after water damage .
(14:03) What's the point? Master Sorin, I liked this answer I read on a forum: when the Front Display Panel moves against the palm rest, the laptop closes (the led should go off) and so the hinges (a very common critical point of failure) It does NOT make any effort or is reduced to the minimum. Another way of saying it, the hall sensor and other technical explanations I leave aside for the moment, as I prefer to always have a hardware problem I would just replace the small 6050A3038301 module and if the fault continues then I seek advice from software experts. All the best
Some hater sents u a nice trap to fool u...
Hello Sorin,
1 - take out the ribbon cable
2 - deep clean everything with isopropyl alcohol
3 - reflow all solders
4 - have you tried to close the cover ? Maybe the hall sensor is shutting down the LED and with the cover open, it is shutting down after some time.
it could be the flex cable, its really bend so maybe its shorting out, you could try another cable
I've had the same laptop and the only thing I could say is that those LEDs are supposed to be ON only while the laptop is ON and there are no touch sensors there. It's just a mechanical button. Touching with your finger is shorting something elsewhere or changing the potential. I'm pretty sure that if you short it and turn on the laptop the LEDs will stay off.
It could be that that light is going on when the "hibernate mode" in Energy Options is activate? In standard Option it is activate but with M2 or SSD drive that is not longer needed. Try to deactivate. That's just a guess.
It could be the light is supposed to be on with the lid open, even when off, so u can find it in the dark, so maybe a sensor issue?
Can it be an anti-tamper warning?
Maybe the backcover was tightened enough, the screws or a metallic back cover could change the resistance on a hall effect sensor and make it turno off when the back cover is correctly positioned.
Ahh cmon you miss the 37 screws in 4 different sizes that you cant tell apart with the human eye 🤣
i hope there will be a part 2 of this vid! With the solution!! 🙂
Sorin the power button is pressed on always its faulty .. remmber when you put back the battery and the laptop was on without pressing the power button you should check that button with resistance ... it also explain why the laptop needed a reset in the first place
That led is supposed to flash if the laptop is in suspend or hibernation mode, so in that case it is intermittedly pulled to ground from the sio chip which is software controlled. In linux it's controlled from the kernel and in windows from the intel ME, which you can set in the device manager! Nice video for LOL...:-)
That’s a weird fault very strange that, Sorin is the best 😊
May be light goes off when lid is closed . It's like light asist .
Missing resistor leaving the input floating. Was marked on board, but nothing there.
13:10 - Example how faulty component change characteristics based on temperature (in this case return to normal function when heated enough). You were not touching it with your hands. Or that pcb has broken track, and when you heat it, PCB bend it self, as expands and make contact to tell to motherboard to stop lightning signal.
Another example can be vibration, when you hit component with plastic pen, it starts working.
17:56 - You can try tweezers with ceramic tip, they isolate you from circuit. Our body has capacitance and you were probably not grounded.
What can happen is that this is only place to manifest problem, but actually can be somewhere on motherboard. Check signals on connector where that flat cable goes on motherboard. Maybe motherboard wants to turn LED on, at all times, maybe its not button at all.
21:00 - Its not light sensor, it cheated you, when you look in side, it turns on, then you bring light.
25:09 - You can find schematics of chips on that small pcb, online, and see what they are for.
27:55 - When if you short signal that is turning LED on, to GND, it will go OFF because voltage goes to ground directly.
I do not think is supposed to work like that, I seccond the opinion that it must be about a pull-up resistor missing/defective. I do not think there is a hall sensor on the tiny board since when lid is closed the LCD screen itself would be about the hall sensor and that is not magnetic. Hall sensors are built usually on the top side of the lid and engage with a magnet in the palmrest.
Maybe somme hight impedance rezistor is commanding the led. When you touch it is activate the light, and the rezidues on board it is modified the interval rezistance ...
I saw something like that on fingerprint sensor... i received a laptop that for liquid damage on power button ( + fingerprint ) it was identifing the liquid damage as a finger on it... lighting the button ( checking fingerprint ) .. o my case when windows is loaded touching the button make a red light ( not accepted fingerprint ) and i didcovered rhe issue.. ( replaced the fingerprint button entirely )
Gate of transistor to turn on leds not connected to anything and finger is coupling AC from air onto gate and turn off transistor. Something is open circuit that control that led. Could be the iochip at the mainboard components if not on that small little board. Biggest mistake is that it is HP.
Hi Sorin
Have you finally seen the light ?
i think there is missing ground, try to grounding the pin that's you touched with the tweezers
Hi Sorin, it seems to me a short somewhere either on the ribbon cable or in the ribbon cable connectors, I would check the the tracks on the ribbon cable.
It is possible that the 3.3v reference going to the power button is shorting out on the LED track but the voltage is not being dropped enough to trigger a notebook shutdown or power on like pressing the button. This can happen with LEDs as they need very low voltage to turn on. Cheers!
The ribbon cable might have some weak or broken connections caused by liquid damage?
Some TV'S I have owned have an always on power indicator to help find the power button in the dark. They can be disabled in the settings. Perhaps that HP laptop has a similar feature which can be disabled in the BIOS? Otherwise, it's a fault.
Those mini power boards and the ribbon cables do go faulty, I had it happened to me, I bought a used one for $1 on Ebay and it cured my problem
This happened with an Asus, because I removed the Azureware wifi card, and replaced it with an Intel compatible from a Siemens. When I put it back, it went back to normal. It also required an Asus windows dvd, pops out the tray to put in the original dvd.
since looks like a fresh windows install i would say its fast boot issue. disable it from windows energy options. i've seen this issue before related to system power states. the laptop appears to be off (s5) but its actually on s4 state (fast startup).
if you put the charger the led go off ?
Bit of corrosion appears a resistor or a filtering cap was damaged. Your finger seems to be the magic noise reduction solution.
I replaced the power board and flex cable on mine, the issue with mine was kinda similar, it will light up when ever it wanted too, not touch sensitive or heat sensitive though.
13:45 😂 mind blowing ,I've no idea. There is no reason to cause that issue
maybe its a light sensor, if its normal. the light is on when you open the laptop to easily find the power button, and it will work when the place is dark, and the sensor maybe place on the keyboard or touch pad area.. now I'm thinking what other say, this issues starts when the owner install the wrong drivers,. so the sensor goes sensitive and malfunctioning, even a tiny hot radiation it will switch.
I found where the fault is at 10:39, too much air on the shirt causing interference!😂😂🤣🤣
Is it a sensor that is meant to light up when you open the laptop LID, and it turns off when you close the laptop LID? But in this case it's faulty and it's not turning off when the laptop lid is closed. Interesting observation when you touch with your finger (your body has a small voltage which is how touch screens work on phones), that small voltage is exciting the connector pin 1 & 2 together :D What doesn't make any sense is the heat gun is exciting the connector also... Unless the movement of hot air is enough to move / bend the cable and the connector in some way... crazy.
Either a cracked solder joint OR the timing-chain jumped a tooth!..(Guessing at 13:35)...
Maybe you can solder a resistor to ground somewhere to turn off the led. Or you solve the software problem mentioned below.
It's a glitch from windows fastboot, deactivate it. Or rest to older ime driver, bb mate.
it normal to react when you touch it because its grounded
its working normal but i think the problem with bios update
or check bios settings
7:03 That was my thought too 🤣☺
Use the tooth-removal tool on the led. The one you used on the previous video , to remove that capacitor 😁
Put a magnet close to the hall sensor and see if it turns off. Maybe if there is a magnet in the screen it could have come loose and shifted? Just an idea. No clue on this one really. If that is a hall sensor, maybe the hall sensor is bad?
those hp elitebook are really nice laptops, hp one of my favorite manufacturers nowadays
Does the hall sensor control it? If the lid is closed it will turn off? Like the lite in the refrigerator?
Possible back feeding thru led circuit. Bad ground in connector seems like. Does it go out when screen closed?
might be a flex-cable (contact-port) issue ...I'd try to resolder some points and also check, if there is a faulty (pull-up/pull-down) resistor as everything is so touch-sensitive (noise)
That problem got me anxiety haha
I have encountered lots of problems like this. And not only with laptops. Everytime the solder looks good and shiny but is sticking only by the components legs. Heating and pulling by components is the only way. They go off before solder melt to uncover oxidated pads with no trace of solder on them - just oxidated copper - components being lifted with the solder on the original shape on their legs. Is a 'miracle' that i usually discover on cheap electronics, but now it appears on nice laptops too.
Is more tragic when a battery BMS with balance function actually in unbalancing the cells because it gets the measurements wrong and is still letting you to charge the battery and use it 🤦. Quality in electronics is not what it used to be.
Bad earth or maybe a weird thermistor fault - yes a bit odd!
Maybe it's like a fridge, on until the lid is shut - lol -.
The owner would know it's unusual, ie, a fault, because he uses it all the time.
It looks capacitive, because metal or anything close triggers it.
Looks like Floating pin that should be grounded through a pull down resistor to work.
Try touching it while laptop is powered on if it did not work then probably it is a failed resistor if it did switch off then you are just shorting a pin to ground and has nothing to do with the fault
The purpose of that light is to drive you crazy. It's the everything is OK light. Seriously though I think maybe a capacitor on the mini-PCB has gone open circuit (or a resistor) and introducing your finger is somehow acting as that faulty component and turning the light off. The only way to know for sure is if somebody else has this exact model of HP. I'd try defaulting the BIOS, as you have and then maybe try updating the BIOS or power management firmware in Windows maybe ACPI or management engine, those sort of drivers. Another thing to try is taking the SSD out and powering it on and off to see if it still does it. If it still stays on then it's probably the system BIOS/UEFI (if it's not a hardware fault).
may be this fault has some issue with capacitor since your finger may increase the capacity somehow!
allrespectation god save you and bless you sir
Open Settings and select System. Select Power and sleep, then click on Additional power settings - in the following window, click on 'Choose what the power button does' in the left-hand pane. In the subsequent window, first, click on 'Change settings that are currently unavailable' ( near the top of the Window ) and then remove the checkmark from the box against 'Turn on fast start-up (recommended)'. Click the Save Settings button, then close any open windows and shut down the notebook by right click the Start Menu icon, select Command Prompt (Admin) and click ‘Yes’ to the UAC prompt.
Type ( or copy and paste ) in the following command ( including spaces ) and hit enter - shutdown /s /t 0
Start the notebook and let Windows fully load for a couple of minutes before checking if it will now shut down correctly from the Start Menu.
@Dianne Wiggil: Thank you very much young lady. Very kind of you and I mean that with complete honesty. An affectionate greeting from Mexico.
I have a 735 G6 as my work PC and i absolutely love it, it's got a Ryzen
It is most likely a Windows setting in Power Options and option to change behaviour of the power button. In the state you have, the power led on all the time is indicating hibernation mode. To get back is usually a press of say, the Esc key or other keyboard key top wake it up. In hibernation mode, power is always on but just enough to keep RAM alive etc for anything stored in it as it is Volatile Memory. Hence, power led always on even though you press the actual laptop power button. IF the power button behaviour is set to hibernate, it will NEVER shutdown even though many may think it would. The behaviour has been changed from shutdown to hibernate.
IF the power button is set to Hibernate in power options in Windows, this may leave the power led always on as in principal, the laptop IS on in hibernation mode as it needs power to keep items in RAM for when it starts back up. Simple answer to check? windows power options advanced view to see the power button behaviour. It is possible for sleep too so nothing wrong with the laptop, just simple user error.
IF the power button is set to hibernate in advanced power options then this simply explains the behaviour of the power led always on. The system is overridden by the OS. NOT a hardware issue but an OS and user issue I am afraid, most of the time. This is usually the problem.
This has been a setting for a very long time and does actually produce this behaviour on many laptops. From slow blinking power led to solid power led light. IF you mess with the electronics in this situation you can actually create a problem when there was none. Not all power button iss8ues will be from hardware issues.
type in search (usually on taskbar) Control Panel
change the view from category (right hand side and up a bit. (view by category)) change to a size of icons you want
select Power Options
on the left you should see several options, click on Choose what the power buttons do
Power is usually the option for shutdown (When I press the power button: Shutdown) if this is set to hibernate then that is all the power button will ever do leaving a power led on all the time.
this option means hibernate doesn't have to be a power option, just clicking the power button on the laptop will put it into hibernate.
If the following is the end result:
search on taskbar->Control Panel->if in Category mode change to icons->Power Options->Choose what the power buttons do->when I press the power button: Hibernate
then change the last to shutdown so like below:
search on taskbar->Control Panel->if in Category mode change to icons->Power Options->Choose what the power buttons do->when I press the power button: Shutdown
Cobblers. He used Shutdown from the Start menu.
nice one.,.. but the problem at hand cannot be solved by those settings..... the laptop was clearly shutdown and the problem persisted.... its either the ribbon cable or defective on switch panel
It's definetly a sweet liquid damage on the connector/ribbon cable
Could I be the sensor for the lid? Over sensitive so when something electronic moves near it it changes? Shorted resistor?? It would make sense that the power button lite when the lid opened and off when closed?
What do use to clean liquid damage ???
Is lid sensor shutting off the led? So when the screen is vlosed the led is off?
Is bios upgrade possible? Maybe there is a better version of bios.
Maybe is like the light inside your refrigerator, it turns on when there is need for light. At least this is my guess.
Just try a short reflow with some good flux
the light goes of when you close the laptop case and the screen touch the batton senscor
id read the models user manual to first understand how the led is meant to function and then take it from there.. once I know what to expect from the led behaviour.
Because it is actually hibernating so that the next boot is very fast. It will turn off completely after it finishes. turn off hibernation from windows setting or check BIOS settings.
The power flex to be precise...
Solid food this one. It's for pros to figure out😅
Maybe it goes off when you close the lid? And comes on when you lift the lid so you can find it in the dark?!
Did you try 5 sec pressed forced shutdown power button behaviour?
maybe it is necessary to solder the connector that had liquid damage and then it is a problem in the flex cable
maybe a faulty resistor change their value with temperature?
this is a hp 840 g5 I have so many laptops in my shop like 10-15 and 2 for repair I'm sure this is not a feature. This a power button problem. just replace with a good button or just make an on/off and GND jumper motherboard to the power button.
Maybe it previously had an intermittent fault on the little daughter board. Something like it was bent before originally being fitted.
Then like a lot of users they started to apply more and more pressure to the button when it wasn't behaving correctly causing more damage to the board.
Like cracked inside the board layers.
Its funny to watch you finding all the different interactions triggering it though 😆
proximity sensor but has a timer after last time activated?
may be because of dry solder
Possible capacitive touch button for some reason
Your body is conected to ground. Tacke your fit of the floor and the led do not turn of when you tuch the cable.
I think it's coming from the flex
Elitebook and ProBook are the best to work on sheer quality
:) cleaning and resolder sensor
You need to add a capacitor on the power line of that small board ;)