P stands for Power. D stands for data, S for signal. Wherever the component references start with a P - like PR03 or PF01, it most probable refers to a power resistor or fuse.
What about U as in U24 on the pcb? Im looking at a digitech gnx3 that is not outputting audio and also not able to get past recalibrating the expression pedal. Im assuming its some kind of resistor but it doesnt actually contact the pedal board. It appears to work by detecting the distance between itsself and a metal rod that sits above it. Ive never seen one like this before though.
@@Wingedmechanic thank you. Im still sorta confused on how i should check if its working. Its got 6 pins and the schematic i found labels it as ic sfh9201 reflective interrupter sms06 i cannot find much about anything about testing it online. Just some websites selling them.
Except all the things he is teaching us aren't always right. Like when he told us we can charge multi-cell(series connected) lipo batteries without a balance charger which is a big NO NO.
@@lockecole6463 But internal differences between cells can easily put them out of balance of each other. Generally it is a bad idea to charge them without at least monitoring the voltages constantly.
Great, I fix a fair few pcb boards, I thought I would watch this video to see what's going on, well I learned two great tests, just shows 30 years on you don't know everything, ever day is a school day, your a natural teacher with no nonsense, great job thank you 😀 if your learning electronics then stay with this guy, you will learn more in one video than you would in 12 months at college trust me, he is a one off guy who can explain without pulling your hair out, top job 👍
I am a field engineer who works on IR, Thermal-conductivity, and Thermogravimetric analyzers with resistance furnaces, electrode furnaces, induction furnaces, etc. I encounter pcb issues all the time, but I wasn’t formally trained as an electrical engineer. These are quite helpful. Thank you.
I'm slow reacting. I just discovered this section... This first lesson I see is sublime, which makes me admire you even more. I promise to see them all. Thank you very much young Graham for your effort, your dedication and mainly for your time and sharing your knowledge with us (repair audio car stereos / video TV). Sincerely grateful. A fraternal embrace from Mexico.
Thanks, being an electrician,who done a TV maintenance course and a Computer repair course (some 15 to 20 years ago) it great to learn a lot more about computers. Keep up the fine work.
This video is just ridiculous! No way you can be more didactic than this. Incredibly well done job with the analysis on the other video and with the explanation here, including the editing by the way.
Brain Pain; word usage of "ridiculous" is quite negative, yet "didactic" is perfectly employed indicating an intentional misuse of the later. Then the popularly abused "incredible", which has a meaning of "not credible" in many interpretations. The grammar is Dancing !!
@@solosailorsv8065 Sailor I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
Awesome instructions. I was able to learn a lot from this video. At 5:50 you started talking about letters describing the fuses, capacitors, etc. I'd like to add that P before F, C and what not means "pico", which in turn means something very small.
Thanks for your insight. BTW Pavel I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
Very good job on your explanation and the video graphic of the circuit pathways explaining how to trace a circuit. In fact you are doing a excellent job on your other videos. I find your logic to be right on. Cheers from BC!
'funny thing i work at a lab fixing cellphones and computers soldering and replacing components and more stuff i didnt finish school and never did any courses i cant sit in class more then 5 minutes losing my patience only hearing this guy standing and talking non stop but siting home blasting my speakers with music while watching this type of vids made me vary good at this
Hi there , it was one of your perfect and informative tutorial video, especially you typed with red color on the screen .It was very simple and understandable. kindly upload more like this video repair without schematics for beginners.thnx
I never wear one. But I do ground myself by touching something that is grounded. (like a frame inside a computer case, or the housing of a power supply. etc. )
this is just the type of information needed to work on things like huge John Deere farm equipment, tesla cars, and a world of other computer things. 😎 thanks. 🤩
Not always fault happen due to short circuit. Once repaired a laptop where friend's daughter poured a cup of lemon tea with milk over keyboard by accident. Laptop didn't switched on anymore. Sometimes it managed to display BIOS screen and then fell back to darkness. Cleaned a lot of milk gunk from motherboard, then found missing +5V in all motherboard. After thorough search under microscope found two tiny traces with corroded resistor between them. Turned out it was a part of main +5V gate which didn't switched on when resistor was disconnected. Found that it was 200 kOm SMD resistor, replaced it and laptop went back to life. It still works just fine. Interesting that keyboard survived and works still at today without sticky keys.
I have a Lenovo that don`t turn on, i found it some bad fuses and remove them, but are the resistors near those removed fuses who are getting very hot....there is still a short?
Use a multimeter to check the resistance to ground. A short circuit is going to be less than 1Ohm between the component and a ground pad. Lots of capacitors and resistors connect to ground on one side, but shouldn't have ground on _both_ sides.
@@Adamant_IT, thanks a lot for taking from your free time to reply, i.ll do that after i buy a multimeter.Thanks again for replying and for the videos!
ok my friend but that is only in case some capacitor is damaged, on the other hand we have endless failures related to resistors or signals that enter or leave the south bridge, pch, super io etc etc, greeting from Saltillo Mexico
Have a Kiprim DC310S bench top dc power supply, made in China, which got pulsed with back emf while delivering power to a dc motor. Unit adjusts and delivers power fine but fails to read and/or display amperage. Voltage is also incorrectly displayed at 2 volts less than set voltage. Was able to enter calibration mode following a Russian RUclips video, but does not calibrate. No schematic available. Some component(s) is burnt but cannot locate. Any suggestions?
Same thing. Inductor, Coil, Choke are all the same type of component. They get called different things depending on their role in the circuit, but technically there's no difference.
Hi, do you have a video regarding in Lenovo yoga 2 pro blank screen. Power On, lights on laptop and keyboard and you can hear fan spin. But screen is blank. How to troubleshoot this issue.
Does the signal injection also apply in through hole electronic components? if not, do you know a video or link that uses this technique in through hole components on a PCB?
The naming conventions of components on laptop motherboards, as shown in the image, typically follow standardized or manufacturer-specific identifiers. These labels help technicians and engineers identify and troubleshoot specific components or sections of the circuit. Here’s a breakdown of what the naming conventions signify: --- ### **1. Prefixes Indicating Component Type** The letters preceding the numbers indicate the type of electronic component or function of the part. Common conventions include: | **Prefix** | **Component Type** | **Examples from Image** | |------------|-------------------------------------------|--------------------------| | **L** | Inductors (chokes, coils) | L5, L12 | | **R** | Resistors | R1, R32 | | **C** | Capacitors | Not labeled here but common (e.g., C1) | | **F** | Fuses | F1 | | **Q** | Transistors (MOSFETs, BJTs) | Q22, Q4 | | **D** | Diodes | D13, D20 | | **U** | Integrated Circuits (ICs) or Chips | U8, U61 | | **P** | Connectors, Ports, or Jumpers | PJ301 | | **J** | Jumpers, Headers, or Connectors | J12 | | **T** | Transformers | None visible here | | **FL** | Ferrite Beads or Inductor-like Filters | FL101, FL102 | These prefixes are typically followed by numbers to uniquely identify the specific component. --- ### **2. Numbering System** - The numbers after the prefix (e.g., `R32`, `L12`, or `FL101`) are unique identifiers for the specific component on the PCB. - In most cases, numbering starts from 1 in a particular category (e.g., resistors may start with R1, R2, etc.) and may increment based on their placement in the circuit. --- ### **3. Example Analysis from the Image** #### **FL101, FL102** - **FL** refers to ferrite beads or filtering components. - These are typically used to suppress high-frequency noise in power lines or data lines. #### **F1** - **F** stands for a fuse, used to protect circuits from overcurrent conditions. - This ensures safety by breaking the circuit when current exceeds safe levels. #### **Q22** - **Q** refers to a transistor, likely a MOSFET here, as is common in power management circuits on motherboards. - Used for switching or power regulation tasks. #### **U8, U61** - **U** denotes integrated circuits (ICs), such as controllers, voltage regulators, or logic gates. - The numbers identify individual ICs in the design. #### **L12** - **L** refers to an inductor, used for filtering or energy storage in switching regulators. #### **JUSB** - **J** typically refers to connectors or headers. Here, **JUSB** likely refers to the USB connector for power or data. #### **D13, D20** - **D** refers to diodes, used for rectification, clamping, or protection against reverse voltage. --- ### **4. Manufacturer-Specific Variations** While these prefixes are widely adopted, some manufacturers may use slightly different conventions. These can vary depending on: - The manufacturer (e.g., Dell, Lenovo, HP, etc.). - The specific design standards or documentation practices of the engineering team. --- ### **5. Debugging or Repair Use** These naming conventions are essential for: 1. **Circuit Diagnosis:** - Helps identify faulty components during troubleshooting. 2. **Referencing Schematics:** - Matches the names on the PCB with schematic diagrams for clarity. 3. **Replacement or Repair:** - Knowing the type of component simplifies sourcing replacements. --- ### **6. Common Areas of Laptop Motherboards** - **Power Management (e.g., FL, Q, U components):** - Ferrite beads (FL), transistors (Q), and ICs (U) are clustered near power input ports or regulators. - **Data Lines (e.g., JUSB, D components):** - Connectors (J) and protection diodes (D) are located near data ports like USB. - **Filter and Protection Components (e.g., F, L components):** - Inductors (L), ferrite beads (FL), and fuses (F) are used to ensure clean power delivery and safety. Understanding these conventions makes it much easier to pinpoint faults and replace damaged components. If you have specific questions about one component or its role in the circuit, feel free to ask!
Hey, what if you don't have any schematic and no labeling on the Board? How can I find the point of power IN and OUT of a board if there is no power connection on it?
Hey man, got an interogstion, working on a ideapad 3 15, I resoled the short on the board (1 capacitor, and 1 burnt mosfet) but now the laptop only blink white at power Led(non-stop) and cpu heating very fast, not able to find any other short Cpu issue🤔😅
so I have a p52 , and I decided to give it a go after following your seeries I found the issue . I know what chip I need to replace . I contacted the maker of the chip and no response . Can you maybe help me out with a lik to where you buy your chips and stuff
Thanks for dis video very informative.... I an HP probook 645 G1 that comes on when I plug in d charger or battery but d screen is black and d fan is on with full speed plz can u help me out
Only led burns, no post. I measure 3.3v at input ‘ON’ button with respect to ground. When I push the ‘ON’ button the voltage drops to zero. Does that mean my 3,3v circuit after ‘ON’ button is shorted?
Excellent video sir. Do you only repair PC's or any type of board, out of anything? I have a main power PCB out of a vintage Robot that needs repair and no schematics. Might you be able to take a look? Where is your shop? What do you charge for your repairs? Would really like to have it fixed.
Hope you get to post some faults that are more to do with signalling faults rather than power supply shorts. Its harder to know if its a chipset, sio chip or other chip error even if a schematic is referred to. You explain well. Thanx.
What could be the problem of a system that turns on only after the battery is removed and left for three days it then works for one day and when you shut down it acts as though it wants to come on but it will shut itself down. It will only come up if I repeat the above process again .
This is amazing content pitched at a perfect level for someone who wants to do practical repairs without a huge amount of theory. Does this kind of analysis and fault finding translate to fault finding in, for example, a modern washing machine's main board? I'm dismayed by the fact that if something goes on the blink nowadays it just gets chucked out because supposedly it's cheaper to buy a new one. I have an old iPod lying around that I can't sync to anymore, my brother threw a TV out that had sound but no picture, I recently replaced an LED spotlight that was probably less than two years old because the LED driver failed but the LED die was still fine. It all seems incredibly wasteful. I'd love to see you fault finding in SMPS, linear power supplies, LED drivers, etc. A lot of the content you can find on this stuff is either way too specific (it's only useful to that specific item with that specific fault) and doesn't really cover what can go wrong in a more general sense and how to find it. Either that, or there's way too much theory and they only explain how the thing works but not how to diagnose and repair faults. Anyway, brilliant content, cheers!
Where can I get schematics? I am trying to fix a landline phone which won’t power on and I can’t find any of the traces so I have no idea where is goes after the batteries.
Amazing video series. Wanted to ask, is the knowledge here 'transferable' to fixing phone motherboards?
3 года назад+1
I'm just trying to push my casual tech support/reinstalling/ssd swaps/lcd swaps/building/outsourcing small business kinda higher and man, DO A UDEMY COURSES, and i will happilly pay for them. Seriously.
Yes they do. This can be easy or hard depending on the make/model. Most Lenovo BIOS files are available on their website, but need a little conversion work before you can flash them directly to a ROM.
Ive watched many many videos of "electronic repair school" channel. He's in Grays UK. Sorin hardly ever uses a schematic. Ive seen him use one for a Macbook Pro, of course.
@Adamant IT Just subscribed to your brilliant channel! Could you share your thoughts on whether repairing boards is a good way to learn and understand PCB design?
Cheers! I think it helps - the best way to learn things is when they apply to something you're already interested in. My long-term goals for this channel are to show my subscribers who like the custom PC content how those things work, so they understand the things they like better. However, laptop mobos are a heavy place to start with PCB design. I would highly recommend watching Big Clive - he buys cheap chinese electronics, takes them apart, and explains how the circuits work. Very, very good place to learn electronics. However, hopefully you can pick up a thing or two from my videos too :)
@@Adamant_IT Thanks for the tips. Yes I will watch Big Clive too. Your videos are absolutely fantastic. You have a way of getting straight to the point and a natural flow from one problem to the next. Of course I will watch all of your videos, every single one of them. I like repairing PCB's too but not at your skill level yet. Keep up the great work and thank you so much for sharing your work, you have another avid fan here :)
@@Adamant_IT Also Electronics REPAIR School,Sorin there is also very informative like you, however thank you, a new subscriber to your excellent channell
P stands for Power. D stands for data, S for signal. Wherever the component references start with a P - like PR03 or PF01, it most probable refers to a power resistor or fuse.
Any good tutorial in Hindi
What about U as in U24 on the pcb? Im looking at a digitech gnx3 that is not outputting audio and also not able to get past recalibrating the expression pedal. Im assuming its some kind of resistor but it doesnt actually contact the pedal board. It appears to work by detecting the distance between itsself and a metal rod that sits above it. Ive never seen one like this before though.
Nevermind i found it. Something called a reflective intteruptor.
@@AdaptiveAudio U stands for integrated circuit (IC).
@@Wingedmechanic thank you. Im still sorta confused on how i should check if its working. Its got 6 pins and the schematic i found labels it as ic sfh9201 reflective interrupter sms06 i cannot find much about anything about testing it online. Just some websites selling them.
the best teacher for Computer Technician and electrical engineering.
Except all the things he is teaching us aren't always right. Like when he told us we can charge multi-cell(series connected) lipo batteries without a balance charger which is a big NO NO.
@@dfn03 you can sir even without bms as long as the Volt Difference of cells is near to 0.3v
@@lockecole6463 But internal differences between cells can easily put them out of balance of each other. Generally it is a bad idea to charge them without at least monitoring the voltages constantly.
@@dfn03 6
Great, I fix a fair few pcb boards, I thought I would watch this video to see what's going on, well I learned two great tests, just shows 30 years on you don't know everything, ever day is a school day, your a natural teacher with no nonsense, great job thank you 😀 if your learning electronics then stay with this guy, you will learn more in one video than you would in 12 months at college trust me, he is a one off guy who can explain without pulling your hair out, top job 👍
I am a field engineer who works on IR, Thermal-conductivity, and Thermogravimetric analyzers with resistance furnaces, electrode furnaces, induction furnaces, etc. I encounter pcb issues all the time, but I wasn’t formally trained as an electrical engineer. These are quite helpful. Thank you.
I'm slow reacting. I just discovered this section... This first lesson I see is sublime, which makes me admire you even more. I promise to see them all. Thank you very much young Graham for your effort, your dedication and mainly for your time and sharing your knowledge with us (repair audio car stereos / video TV). Sincerely grateful. A fraternal embrace from Mexico.
Best instructables on YT for a beginner! Cheers mate so happy to have found your channel!
He is a rare find , so good no hype-thumbnails.
Thanks, being an electrician,who done a TV maintenance course and a Computer repair course (some 15 to 20 years ago) it great to learn a lot more about computers. Keep up the fine work.
My first ever repair tutorials.i can't thank you enough man
He is one of the best channel for hardware repair. And damn to do it without schematic is master level
Excellent video series, you are the first that you explain the fault's and the solutions so simply!!! Thanks!!!
This video is just ridiculous! No way you can be more didactic than this. Incredibly well done job with the analysis on the other video and with the explanation here, including the editing by the way.
Brain Pain; word usage of "ridiculous" is quite negative, yet "didactic" is perfectly employed indicating an intentional misuse of the later. Then the popularly abused "incredible", which has a meaning of "not credible" in many interpretations. The grammar is Dancing !!
@@solosailorsv8065 Sailor I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe.
I got it in my about tab.
Awesome instructions. I was able to learn a lot from this video. At 5:50 you started talking about letters describing the fuses, capacitors, etc. I'd like to add that P before F, C and what not means "pico", which in turn means something very small.
Thanks for your insight.
BTW Pavel I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe.
I got it in my about tab.
Really good video for generalised theory and learning. It helps to build up knowledge in layers.
Very interesting.
I just watched this whole video without falling asleep or maybe I’m just a tech geek for this stuff.
This is also a great video I havev watched so many times, the base for a proper diagnose procedure
The best channel for beginners.
best channel ever for beginners
Very good job on your explanation and the video graphic of the circuit pathways explaining how to trace a circuit. In fact you are doing a excellent job on your other videos. I find your logic to be right on. Cheers from BC!
Excellent way of making understand about mother board. short n sweet Demonstration with excellent clarity in voice. thanks for such a nice video.
repair without a schematic! Thank you sooooooo much!!!
Amazing! First video from you and i automatically subscribed.
Thank you for helping me boost my electronics knowledge.
Very informative video, 12min of full information
Thank you very much for your dedication for teaching in such a very good, simple and structured way, I learned a lot
Love this video! Thank you so much and I have learned from this video and can fix without schematic
'funny thing
i work at a lab fixing cellphones and computers
soldering and replacing components and more stuff
i didnt finish school and never did any courses
i cant sit in class more then 5 minutes losing my patience only hearing this guy standing and talking non stop
but siting home blasting my speakers with music while watching this type of vids made me vary good at this
ADHD
@@onetwo6806 basically yep 😏
Why is there one thumbs down? I guess we need to connect two wires to him/her and run some current . You know, to find where the problem is ;-)
The manufacturers that want you to buy another instead of repairing.
best IT teacher.
Really appreciate your videos! Ive been able to learn A lot from your content!
best video for reaper !!!! thanks for sharing
Great work! Very good explained. Thanks a lot.
Thank you very much for your video, you explain perfectly for someone who lacks knowledge in electronics. Greetings from Mexico City
Great Video, you have inspired me to go back to my Samsung laptop that has a short to grd on the 19v rail! Thanks
Hi there , it was one of your perfect and informative tutorial video, especially you typed with red color on the screen .It was very simple and understandable. kindly upload more like this video repair without schematics for beginners.thnx
I never wear one. But I do ground myself by touching something that is grounded. (like a frame inside a computer case, or the housing of a power supply. etc. )
this is just the type of information needed to work on things like huge John Deere farm equipment, tesla cars, and a world of other computer things. 😎 thanks. 🤩
Not always fault happen due to short circuit. Once repaired a laptop where friend's daughter poured a cup of lemon tea with milk over keyboard by accident. Laptop didn't switched on anymore. Sometimes it managed to display BIOS screen and then fell back to darkness. Cleaned a lot of milk gunk from motherboard, then found missing +5V in all motherboard. After thorough search under microscope found two tiny traces with corroded resistor between them. Turned out it was a part of main +5V gate which didn't switched on when resistor was disconnected. Found that it was 200 kOm SMD resistor, replaced it and laptop went back to life. It still works just fine. Interesting that keyboard survived and works still at today without sticky keys.
Sincere thanks for sharing your very practical knowledge.
Outstanding, Louis Rossman without the home-spun philosophy.
I have a Lenovo that don`t turn on, i found it some bad fuses and remove them, but are the resistors near those removed fuses who are getting very hot....there is still a short?
Use a multimeter to check the resistance to ground. A short circuit is going to be less than 1Ohm between the component and a ground pad. Lots of capacitors and resistors connect to ground on one side, but shouldn't have ground on _both_ sides.
@@Adamant_IT, thanks a lot for taking from your free time to reply, i.ll do that after i buy a multimeter.Thanks again for replying and for the videos!
Super helpful video. Thank you sharing all education videos… you are best teacher…
ok my friend but that is only in case some capacitor is damaged, on the other hand we have endless failures related to resistors or signals that enter or leave the south bridge, pch, super io etc etc, greeting from Saltillo Mexico
After seeing this I really helpful with this video
Excellent video!
I love your Chanel. I am happy I found your channel. You make a beginner understand board repair easily. Please give more update sir. Thanks so much
you should be teaching kids how to do this, fantastic vidoes
very informative and I really enjoy your channel
Yes very Good at getting a point across you would make a Good mentor
Sir, your videos are very helpful and informative
Thanks for making these videos and sharing Your knowledge.
Best regards
Have a Kiprim DC310S bench top dc power supply, made in China, which got pulsed with back emf while delivering power to a dc motor. Unit adjusts and delivers power fine but fails to read and/or display amperage. Voltage is also incorrectly displayed at 2 volts less than set voltage. Was able to enter calibration mode following a Russian RUclips video, but does not calibrate. No schematic available. Some component(s) is burnt but cannot locate. Any suggestions?
That's an excellent job my friend 9.8/10
What is meant by the term live boot ok concerning a laptop advertisement?
Hi, would you give me the list of usable capacitor to laptop repair ?
Sir, please make video about the differenc between inductor and coil.
Same thing. Inductor, Coil, Choke are all the same type of component. They get called different things depending on their role in the circuit, but technically there's no difference.
Well explained, thanks. So glad that Macbook stuff has "come our way" though :) plus Macbook repair is where the money is
Hi, do you have a video regarding in Lenovo yoga 2 pro blank screen. Power On, lights on laptop and keyboard and you can hear fan spin. But screen is blank. How to troubleshoot this issue.
@@joeybi3504 you might be better directing your query to Adamant IT
@@joeybi3504 Check the display cable.
True, but for hobbyists and DIY repairs, PC laptops are much better.
Does the signal injection also apply in through hole electronic components? if not, do you know a video or link that uses this technique in through hole components on a PCB?
I've one PCBA in hand. Whenever I tried to power up the fuse is always blew. Could you help me to figure out the problem ?
Hi Adamant can you help me through video call repair my laptop with no backlight?
I was looking for such theory..
Keep the macro way..thanks
Thank you
The naming conventions of components on laptop motherboards, as shown in the image, typically follow standardized or manufacturer-specific identifiers. These labels help technicians and engineers identify and troubleshoot specific components or sections of the circuit. Here’s a breakdown of what the naming conventions signify:
---
### **1. Prefixes Indicating Component Type**
The letters preceding the numbers indicate the type of electronic component or function of the part. Common conventions include:
| **Prefix** | **Component Type** | **Examples from Image** |
|------------|-------------------------------------------|--------------------------|
| **L** | Inductors (chokes, coils) | L5, L12 |
| **R** | Resistors | R1, R32 |
| **C** | Capacitors | Not labeled here but common (e.g., C1) |
| **F** | Fuses | F1 |
| **Q** | Transistors (MOSFETs, BJTs) | Q22, Q4 |
| **D** | Diodes | D13, D20 |
| **U** | Integrated Circuits (ICs) or Chips | U8, U61 |
| **P** | Connectors, Ports, or Jumpers | PJ301 |
| **J** | Jumpers, Headers, or Connectors | J12 |
| **T** | Transformers | None visible here |
| **FL** | Ferrite Beads or Inductor-like Filters | FL101, FL102 |
These prefixes are typically followed by numbers to uniquely identify the specific component.
---
### **2. Numbering System**
- The numbers after the prefix (e.g., `R32`, `L12`, or `FL101`) are unique identifiers for the specific component on the PCB.
- In most cases, numbering starts from 1 in a particular category (e.g., resistors may start with R1, R2, etc.) and may increment based on their placement in the circuit.
---
### **3. Example Analysis from the Image**
#### **FL101, FL102**
- **FL** refers to ferrite beads or filtering components.
- These are typically used to suppress high-frequency noise in power lines or data lines.
#### **F1**
- **F** stands for a fuse, used to protect circuits from overcurrent conditions.
- This ensures safety by breaking the circuit when current exceeds safe levels.
#### **Q22**
- **Q** refers to a transistor, likely a MOSFET here, as is common in power management circuits on motherboards.
- Used for switching or power regulation tasks.
#### **U8, U61**
- **U** denotes integrated circuits (ICs), such as controllers, voltage regulators, or logic gates.
- The numbers identify individual ICs in the design.
#### **L12**
- **L** refers to an inductor, used for filtering or energy storage in switching regulators.
#### **JUSB**
- **J** typically refers to connectors or headers. Here, **JUSB** likely refers to the USB connector for power or data.
#### **D13, D20**
- **D** refers to diodes, used for rectification, clamping, or protection against reverse voltage.
---
### **4. Manufacturer-Specific Variations**
While these prefixes are widely adopted, some manufacturers may use slightly different conventions. These can vary depending on:
- The manufacturer (e.g., Dell, Lenovo, HP, etc.).
- The specific design standards or documentation practices of the engineering team.
---
### **5. Debugging or Repair Use**
These naming conventions are essential for:
1. **Circuit Diagnosis:**
- Helps identify faulty components during troubleshooting.
2. **Referencing Schematics:**
- Matches the names on the PCB with schematic diagrams for clarity.
3. **Replacement or Repair:**
- Knowing the type of component simplifies sourcing replacements.
---
### **6. Common Areas of Laptop Motherboards**
- **Power Management (e.g., FL, Q, U components):**
- Ferrite beads (FL), transistors (Q), and ICs (U) are clustered near power input ports or regulators.
- **Data Lines (e.g., JUSB, D components):**
- Connectors (J) and protection diodes (D) are located near data ports like USB.
- **Filter and Protection Components (e.g., F, L components):**
- Inductors (L), ferrite beads (FL), and fuses (F) are used to ensure clean power delivery and safety.
Understanding these conventions makes it much easier to pinpoint faults and replace damaged components. If you have specific questions about one component or its role in the circuit, feel free to ask!
Hey, what if you don't have any schematic and no labeling on the Board? How can I find the point of power IN and OUT of a board if there is no power connection on it?
Hey man, got an interogstion, working on a ideapad 3 15, I resoled the short on the board (1 capacitor, and 1 burnt mosfet) but now the laptop only blink white at power Led(non-stop) and cpu heating very fast, not able to find any other short
Cpu issue🤔😅
How do i know the model of the capacitor to change it. I have a bad capacitor that needed to be replace but don't know the type
Are servo amplifier circuit board more complicated than pc motherboard?
so I have a p52 , and I decided to give it a go after following your seeries I found the issue . I know what chip I need to replace . I contacted the maker of the chip and no response . Can you maybe help me out with a lik to where you buy your chips and stuff
Thanks for dis video very informative....
I an HP probook 645 G1 that comes on when I plug in d charger or battery but d screen is black and d fan is on with full speed plz can u help me out
Only led burns, no post.
I measure 3.3v at input ‘ON’ button with respect to ground. When I push the ‘ON’ button the voltage drops to zero. Does that mean my 3,3v circuit after ‘ON’ button is shorted?
Excellent video sir. Do you only repair PC's or any type of board, out of anything? I have a main power PCB out of a vintage Robot that needs repair and no schematics. Might you be able to take a look? Where is your shop? What do you charge for your repairs? Would really like to have it fixed.
please upload more like this video ( Diagnosing without schematics) for beginner
Thanks for the information, it is helpful. 👍
is ther any video about surface pro 4 pcb ,
Hope you get to post some faults that are more to do with signalling faults rather than power supply shorts. Its harder to know if its a chipset, sio chip or other chip error even if a schematic is referred to. You explain well. Thanx.
What could be the problem of a system that turns on only after the battery is removed and left for three days it then works for one day and when you shut down it acts as though it wants to come on but it will shut itself down. It will only come up if I repeat the above process again .
Please sir, do you have videos on other electronics?
Hi there, your tutorial video was very useful and informative. Keep it up. Thnx
I've read the EU is about to mandate schematic and parts availability. Hope they do.
very clear, thanks!!
This is amazing content pitched at a perfect level for someone who wants to do practical repairs without a huge amount of theory. Does this kind of analysis and fault finding translate to fault finding in, for example, a modern washing machine's main board? I'm dismayed by the fact that if something goes on the blink nowadays it just gets chucked out because supposedly it's cheaper to buy a new one. I have an old iPod lying around that I can't sync to anymore, my brother threw a TV out that had sound but no picture, I recently replaced an LED spotlight that was probably less than two years old because the LED driver failed but the LED die was still fine. It all seems incredibly wasteful.
I'd love to see you fault finding in SMPS, linear power supplies, LED drivers, etc. A lot of the content you can find on this stuff is either way too specific (it's only useful to that specific item with that specific fault) and doesn't really cover what can go wrong in a more general sense and how to find it. Either that, or there's way too much theory and they only explain how the thing works but not how to diagnose and repair faults.
Anyway, brilliant content, cheers!
where would I get that magnifier/light you are using and what is it called.
Very informative. Thanks!!
Where can I get schematics? I am trying to fix a landline phone which won’t power on and I can’t find any of the traces so I have no idea where is goes after the batteries.
Amazing video series. Wanted to ask, is the knowledge here 'transferable' to fixing phone motherboards?
I'm just trying to push my casual tech support/reinstalling/ssd swaps/lcd swaps/building/outsourcing small business kinda higher and man, DO A UDEMY COURSES, and i will happilly pay for them. Seriously.
thank you Adam!
Question: if I have to replace a ROM if all the information matches the top do they have to be reprogrammed?
Yes they do. This can be easy or hard depending on the make/model. Most Lenovo BIOS files are available on their website, but need a little conversion work before you can flash them directly to a ROM.
very good work.
Another great video keep em coming
Ive watched many many videos of "electronic repair school" channel. He's in Grays UK. Sorin hardly ever uses a schematic. Ive seen him use one for a Macbook Pro, of course.
Top video! I would like more videos like this!
I LOVE YOU SIR! Thank you for this Video.
Your the great teacher for me.😊😊😊😊
What a teacher unbelievable! 👍
How long does it roughly take to diagnose mobo fault and what equipment does one need.
.. God bless sir .. always watching take care 😇🤗
Great video
3:10 Capacitor absorbing voltage spike from inductors collapsing magnetic field when circuit opens?
@Adamant IT Just subscribed to your brilliant channel! Could you share your thoughts on whether repairing boards is a good way to learn and understand PCB design?
Cheers! I think it helps - the best way to learn things is when they apply to something you're already interested in. My long-term goals for this channel are to show my subscribers who like the custom PC content how those things work, so they understand the things they like better.
However, laptop mobos are a heavy place to start with PCB design. I would highly recommend watching Big Clive - he buys cheap chinese electronics, takes them apart, and explains how the circuits work. Very, very good place to learn electronics. However, hopefully you can pick up a thing or two from my videos too :)
@@Adamant_IT Thanks for the tips. Yes I will watch Big Clive too. Your videos are absolutely fantastic. You have a way of getting straight to the point and a natural flow from one problem to the next. Of course I will watch all of your videos, every single one of them. I like repairing PCB's too but not at your skill level yet. Keep up the great work and thank you so much for sharing your work, you have another avid fan here :)
@@Adamant_IT Also Electronics REPAIR School,Sorin there is also very informative like you, however thank you, a new subscriber to your excellent channell
very clear and understandable. thanks
great video !!