SMD bad capacitor test / laptop - desktop computer & electronics troubleshooting
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- Опубликовано: 17 окт 2024
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The clearest and most efficient guide on short circuit finding and repair that I have seen on RUclips. Thank you so much for making such excellent training videos!
I had to watch your video a couple of times before I fully understood what you were doing. An excellent, well-explained and logical approach to locating a bad SMD capacitor, and a great tip on calculating it's probable value. Thank you very much for putting this video up on youtube!
Never ever watch so clear video and so nice voice. Your style is unique and sharp. Every single second is useful.
Best video ever on the short circuits on capacitors, a lot of guru spend millions on words without getting to the point and you clarified the short circuit find to me in just one video with real tips
As an English speaker it was a little hard to understand but not impossible at all. Within a minute I knew exactly what was being said and I actually learned A LOT! Especially the part about cutting off the search areas using those pads! I had no idea before now and already used that tip to repair another device.
Thanks a lot for this video!
Wow! My english level is B2 and I had absolutely no trouble understanding what he is saying. How is that even possible?
@@Daniel-ih5ei
Are you new to electronics like me?
Because I meant understanding the electronics jargon, not the language itself. If not, that's probably why!
*the more you know*
So you desolder the pads to isolate the area? How can you tell an area is bad or good once isolated?
thank you i have rx 480 graphics card both fuse capacitors blown but also a smd (small one like yours) 2 are short circuit but I don't know the values so if i dont know the values what cap i put to replce them? what would be safe??? 0.1 ???
Dear sir video very good for us. But please help me with two types of SMD. which I can't find in the catalog. 34DG and L44. I don't know what they are! Transistors or diodes. I'm waiting for your answer, if you're good and want to help me. Thank you so much!
Great video- helped me do a sanity check on my Alpine PDX’s SMD capacitors before removing and replacing a bunch of them, let alone having to pay yet another Digi-Key or Mouser shipping fee.
Your voice is so calm. Easy to follow your steps
They are a headache when you are a beginner at repair. In LCD / LED TVs it is common to find one of them shorted but “reflecting” simultaneously also on other circuit components on the small and long PCB attached to the Panel. Thank you very much for the advice (6:57) and sharing. A sincere greeting from Mexico.
I didn’t get the bit where he said to copy the information of neighbouring capacitors. What does he mean?
I removed a shorted SMD capacitor on a TV board, but the TV still doesn't work. The capacitor was very small. Should I put a new capacitor in order for the TV to work?
Bravo, the video is very nice, with visual explanation that helps even those like me who do not know English well. Thank you
Excellent fault finding!!! Another method is to turn it on and leave it on. The shorting cap will get HOT. to find it, use a finger or a thermal camera (I used a Fluke Ti10).
This is one of the best electronic explanation I have seen. clear and interesting. Thank you very much
So do you want continuity on both side or only one side of the capacitor?
Your explanation is very good and slowly and clearly and gradually takes you the point. Also you have and extensive knowledge in electronics.
Just one problem, the way you lifting SMD capacitor is damaging the board, because SMDs has no lead to bend as other conventional components. Why you don’t use desoldering tool like the pump to absorb the molten solder and clears all solder from the area. That gives you not lift the SMD component most of the time or in some cases you need to lift a little which allow you not to damage the printed board.
Hi! It is easy with a hot air and tweezers. When I moved to here, I didn't have a good soldering station until several months later. No everybody has one in other places where life is harder, so it is good to teach to work with rudiments. But back to the problem, most electronics components should be exposed to more than the solder melting temperature and for less than 10 seconds. I work many years as a process and manufacturing engineer too, and I have that very clear as designer since the beginning. In one car ECU video I was criticized by lifting the capacitor on the side. If I do it, will use the right temperature for short period of time, while hot air is very high temperature for maybe longer time. Automotive safety rules are very high, and also to replace the component by other brand no specified by the designer... Industrial SMT solder process and ESD manipulation exposure is where more latent issues happen, that ends two years later with the damaged components that we are repairing in this laptop main board. A good rework must include ESD, moisture removal, pre heat, flux and cleaning, in a very well controlled way. It depends of the situation for me to use pre heat, iron lifting, hot air, or component sucking. After many years doing rework since 1984, I am like an old surgieron with the knife, I know to take care of do not delaminate the PCB. But it is only with practice. Many times I watched youtube iphone repairs, it looks nice and fast, but those guys are just over cooking the telephone for next soonest fail. I use a lot the hot air. But in some cases I use the iron, and the one in the video is the iron attached to the same hot air soldering station. (There are more chance to delaminate the internal layers of the PCB with hot air than to damage the pad with the soldering iron. So I avoid hot air in multi layer PCB or safety components requirentes, unless components are too big). ;-)
Very nice
What about some smd capacitors dont give sound in the two side... is it broken...or need fix? Thanks
Does SMD mini capacitors have a negative and positive value? I always get confused if they could sold in any position. Let me know. I really wanna know more about thos small tiny caps.
Thanks, well explained, I tested a video cable connector board and its faulty, thanks to your explanation, I have two questions, the letter next to the components means the type of the component is, for example, C for capacitor R for resistor? the other question is where I can get the replacements
very very helpful. Is there a video for resistor, IC and/or transitor ?
Hi Bob, I've been troubleshooting and repairing these types of problems for over 16 years. If you can afford a Polar Toneohm 950 its well worth the money. It would have found that short defect within 5 to 10 minuets. Great video though. Have a good one!
Lol, he's in India man. He's happy just to have a $3 multimeter.
@@robh1908 accent sounds greek
Hi Bob. Kalpon, i have a problem with the same board. its hp 2000 right? Well mine can charge an boot normaly but the problem is that once its on the u520 ic become hot and when i test all the capacitors that links to the ic most of them beebs on both side. what advice can i get, to keep trying to fix it or to just buy a new board?
What is wrong with approach:
Red on ground and set meter to diode mode. Check both ends of capacitor with black probe. Capacitor should have ground only on one end. A shorted capacitor will be grounded on both ends.
If you want to remove the shorted capacitor, then desolder it and check to see if short goes away in diode mode with red on ground.
I have a question...I noticed that my motherboard has a white stuff in the capacitor do you know if it's normally happened or it's shorted?
@@ywhad is it bulging on top. Is it an electrolytic capacitor or a surface mount?
electrolytic and it's not bulged...a white stuff appear like veins in the capacitor when I turned on my computer and the PSU is not spinning and found out that my PSU is shorted and it smells a lil burnt and I don't know if it may affect my motherboard
. just buy a refurbished computer off Ebay from a seller with at least 98% approval rating and they provide a 30 to 60 day warranty. Then remove hard drive from old computer and hook up to new computer via SATA/IDE to USB connection. Otherwise, take old computer to a repair shop so they can determine which components are bad and have them fix.
Best repair educational video i seen so far. Keep up the great work. Big thanks. 😃
Can you explain how to use airgun to take out a capasitor?
Very Good! Thx for your video! You can also check at the coils (especially bucks) for shorts. If yes, remove the coil and check it's pads to see which side the short is on. Cheers!
Thank you so much!
Is there a case where a bad capacitor is in open circuit?
Thank you! Excellent instructions video.
Very clearly laid out.
You just saved my £200 worth laptop!
Yeah, bad cap. Opening pads really help in diagnostics.
Thank you sooooo much Sir!
Helo.. Sir.. I have one pcb led tv.main board. The line capasitor have short.. That sound the beeb different.. But it show beeb short.. What couse the problem..? I pull out capasitor.than test.. It not short.. But line + and - short..
Good video it's mega hard to find out what's the value of capacitor but use the value of the next capacitor thanks
so you are testing smd capacitors in circuit without a power supply using only the tiny 2mA provided by your meter in continuity mode? a board can have hundreeds of capacitors do i have to try them one by one?
"The bad guy in this movie"! Thanks for posting this!
Hi mate
I have this exact board but with a different problem, the caps lock blinks 3 times in a sequence and no picture on the screen. I measured the voltages on the board and all are present, 19v, 5v, 1.5v,
When the CPU is in the socket but the laptop is not powered on ALL capacitors around from the bottom side are in short, when i power on the laptop only the three marked on the picture are in short. When i take off the CPU no capacitor is in short...
I guess it is the CPU that is causing the short?I
tried several known good ram sticks but no picture.
sir by all due respect, ur checking component w/ laptop bios battery still present???
and i think it much better to use diode mode, and positive probe to ground, not the other way around...
Ok! Good question!!! I remove the battery. But it was there, because I tried to check if its voltage was disconnected, and in the while, I decided to make a video. In another videos I said we must remove the power sources, battery and bios battery. In this case, it was there, already insulated by opening a PCB pad. But to make any Ohms test, even in diode test, the battery must be removed.
Use the negative to ground, because most DMM can supply more than two or even 3 volts in the Ohm test, and now day's most digital systems in a computer are 1.8 Volts. It can resist for a while the over voltage, but it is not good to invert the polarity in digital Systems.
its ur channel anyways...
Great Video. I learn more on repair electronic SMD equipments. Great Job. Ciao Max
Hi
Why you put one side of the multimeter on the ground board and not just on the other side of the capacitor?
Thanks
Yossi
Hi! Because the short circuit is to ground.
Bob. Kalpon you you want see the short if you put the multimeter on one side and on the second side?
Your explanation was like daylight. Good job thanks.
Hello Bob, My name is Mike from Nigeria. I have an Hp Envy 23 touchsmart pc. there is power but no display on the screen. I tried to clear the bios but no luck. with your experience what do you think could be the fault pls? thank you Bob
I hope you do more videos like this one.
Thanks
i got an 17 r4 and when i plug it in. the light on charger goes out. so i took it apart unpluged the dc in and the charger will stay on but when i plug it in the light will go back out and when i plug in to the dc port i will see a spark. and the port smells it there a could that be a bad captor thats making it ark im going to test it in a few thanks
man im fixing vga cards alot or tying,,,really educational i always new everything on that board is there for something good tips and tricks!! i wish you could get detailed,i no you can ..but certain big companies wont talk show schematics without worrying about getting in trouble for it ,lots of props!!! make some on vrm and the stone looking block resistors i need help ive got 10000$$$ in graphics cards that imm stumped and no one will fix them?? good video again..
Hi please can you help I believe you have lot of experience in the field. I am working on aN ECU there are two capacitors in the entire board with no reading at all. I mean at all. I even removed them and there is no reading . Have you ever came across micro capacitor with no reading when checking with multimeter. All the rest of the capacitors have readings.
Hope to hear from you regards
Nice video, very helpful. I followed your steps to repair an LCD and succeeded! Now I just need to buy a 0805 100nF ceramic capacitor. Just wondering, is it ok to just leave the circuit without the capacitor? Obviously it works, but if the designers put the capacitor there I'm sure it's for a reason.
Hi! Most of the time those capacitors are to filter noise. There are other capacitors in parallel doing the same job, so maybe we can go without it. A good advice would be, please check if your cap wasn't located next to a very low Ohms resistor, or next to a very noise sensitive IC. If that was the case, you can order one capacitor, or if the device under repairing is already old and no expensive or no critical like the "Anesthesia Machine's LCD", you can replace your capacitor with an used one.
@@bob.kalpon1398 Thanks, I've just checked the PCB but it's hard to tell what the capacitor is next to. Without a schematic it's very hard to reverse-engineer. But I can see that there are many other capacitors on the PCB that look exactly the same, and with the multi-metre I can verify they are connected in parallel, which matches your description. I don't have any old "donor" electronics at the moment, so I will just order the capacitor. Thanks again!
Hello my teacher ... I hope you are in good health ... Thank you for this very useful video ... This way I checked Motherboard one of the computers and found more than twenty capacitors is corrupted ... Is it really corrupted ??? Thank you for the quick answer ...
Note: Translation by Google.
How To Check SMD Resistor and inductor On Motherboard and what symbol of (resistor,capacitor,inductor) in the circuitboard plz
.. thank you sir for verry informative vedios .. good job..and God bless 😇🤗
Good video. But I have a problem... The capacitor was cracked and lost. How to find lost capacitor value?
great vid! I'm trying to find prob w a harmon kardon blue tooth speaker.. ill check the c and r,s but what is a L? it is oblong square just like the c,s and grey says L20
what if there continuity but its undervalued? So in other words what if the component has a value but its not what it should be? How would you test that?
Hi Bob!
I have a question, what would be the problem if the motherboard of a laptop does not turn on. But the red LED lights up when the charger is connected. I visually check the circuit but found no damage or burnt component. I checked some mosfets, they seems to be okay.
hi bob can you help me with my motherboard ? a capacitor disintegrated after short circuit
Those pads don't seem as easy to find on a desktop motherboard. I've got a bad motherboard and a whole load of capacitors, big and small, around and behind the CPU socket are beeping on both ends. Capacitors on the lower part of the board however only beep to ground on one side. How do I narrow it down with all those beeping capacitors around the CPU?
Hi all. I just wanted to ask.. a very tiny capacitor fell of the laptop but it’s still working! Is it normal?
Yes.There will be 2 or More Capactors in that Series Connection,if one gone,the Circuit will Still Work.
Hi Bob.
Great tutorials!
So if understand this correctly you can't have earth on both sides of a smd capacitor?
Thanks!
Yes. A capacitor in short circuit will have conduction from one side to the other. If one capacitor had a side connected to ground, and it gets in short circuit, then both sides will be grounded. It means this is a bad capacitor.
If cap is 25nf can be use 95nf ?
Hi My old Dell laptop is starting only after more than 20times hit. After each hit on lighted and off. Help me please. What area of motherboard need me check? Thank you
how can i identify the working neighbor component to buy a new one ? theres no markings on it ... ? is there any possibility to measure it ?
hi thanks for video. How to get the required capacitor. What is the name of the same name if it is used on internet? Is typing correct as c6710?
No. Thats the board code/location. These are ceramic capacitors, also called mmcs.
They come in sizes like resisors do and have values but finding the values is hard. I came here to see if he reads the values but he does not lol.
There is a way to measure with multimeter to calculate the values.
We may have to 1, buy a kit with all values, 2, find same sizes off another board and try them or 3, work out a way to calculate the value.
Im try 2 and 3 ☺
Thanks sir 🙏🙏 for taking your time to explain everything
When testing those capacitors, what if you get a short beep on one side but no sound on the other side?
Hey guys I have a laptop
Motherboard where I’ve tested for continuity on some of the caps and found that there are quite a few around about 10 caps that are grounded on both ends. I haven’t tested the entire board but would this indicate that maybe a surge killed these caps, there were also some caps that both ends were not connected to ground as well These were all tested when connected to the pcb, should I despiser one end and test again or can we assume the motherboard is no good as there could be more.
Like the simple way of explanation & nice work...✌️✌️✌️
Keep it up 👍👍👍
at least someone who knows how to explain.
and speaks proper english
A superb job sir.well done.keep up the great work sir.
Best lecture and trouble shooting.
Great video 👍 keep up the good work
removing smd capacitor one side is a bit risky because you could damage the trace or capacitor soldering point , better to remove it by adding solder both side in quick way.
Thanks Bob! great video. Just one question. The circuit boards that dont come with the option of separating different stages of the circuit by removing solder ....how to find exact location of the fault?
But I know in testing bad capacitor is the positive arm of the multimeter is the one that should touch the ground and we call this GND test
A short can still get to ground. This is an open circuit/break as the failed component cant get to ground, right?
Hi! This is a stage break from source. We can separate the stage circuit from its power source. The idea is to reduce and locate the failure area, because a short circuit between the power source lines is reflected all over in almost all the stages when the laptop, tablet or smartphone is powered on.
Excellent work Sir!
Can I test regular capacitors in the same way as you test smd capacitors for continuity ?
I must not know enough about circuits to understand this fully.
I get that any capacitor will have one pin soldered to ground, so one side should for sure beep. Then, if the other side beeps to ground too, it's a bad capacitor?
Hi! Some capacitors with low resistance are part of a switching power supply configuration and there are inductance and diodes with it. No all capacitors have one lead to ground. But most of the bad capacitors will be on of those with the lead to ground. There are always a capacitor in parallel with a very low resistance used for current measurement. Only studying, logic, experience and searching will help you find the answer. To make a little diagram of the one you find with low resistance or "short" will help you to understand the function and configuration.
Hi, if you do not have the schematics for the board, how do you know the correct spec for the SMD capacacitor ?
Hi! Most of the time we don{t have schematics. If the capacitor is in parallel to the voltage source, it could be 0.1uF. Other ones, could be compared with other capacitor alike in other stage of the circuit. There is nothing to lose. Because we recovering a lost board.
Great teaching
Thanks for sharing!
Thanks 👍 found a shorted CPU causing all the capacitors to short around it
once we found the bad capacitor, how do we replace it since they are so small and not available for sales
Please Bob thanks please make us more videos on testing components in circuit
wow, perfect. i a problem with my tower case hp cpu, when i power on, it keeps restarting over and over, what would likely to be a hardware problem in the motherboard ?
Bro can I use same color and same size ceramic smd capacitor . Actually Mera bike abs ecu water damage ho gaya iska board diagram nahia hm be pura all smd check Diya no short-circuit but one dark brown color ceramic smd on ecu board it's damaged one point . So I couldn't calculate the value of the smd capacitor . Than what will do to replace . Please help bro . This smd capacitor on board no value no marks are mentioned . After I searched on Google it can any side ceramic capacitors
Great explanations, thanks !
Thank you so much. I was stuck with a SSD drive that stopped working because I pushed a 4pin to SATA connector the wrong way into the drive and it got shorted. Then using your method I checked the capacitors, I found 2 of them gone bad. Only problem: how to find value of smd capacitors?
To my knowledge you need schematics for that
Hi. I'm still learning, I have 3 ceramic caps on a board. When I test in continuity mode I don't get a beep when I touch the cap with the probes, but if I check in diode mode I'm getting a reading of about 575
Usually ceramic caps last longer than 'wet' caps and aren't usually the culprit. If you want to really test capacitors, you need to remove them from the board. That's testing for capacitance though and not continuity.
Those damn cheap little smd parts. Very impressive that you found it!
I have a blown capacitor, can I just replace it? Literally blown with smoke and everything, by the way do they have a side?
Very good tips, thank you.
Hi !
I felt easy to understand. good information.
Thank you for sharing clip.
Best Wishes
...and two years later; "Silas, where are you"? It has been long time since it.
What if your board doesn’t have “jumper pads”?
.keep up the great work sir.
Thanks. I found multiple open and shorted smd caps in the same area on a hdmi board. The identification numbers are unreadable! How do you know the correct polarity and ohms when you replace with new ones? Replacing them would be a tedious process as some of them are the size of tiny ants! EDIT: I bought a ESR METER and retested the faulty SMD capacitors and it read " LOW ESR" good capacitor! ?????? I am going mad in the head!
Is there a + and - for that capacitor? tks
No, ceramic capacitors do not have polarity.
It doesn't matter which way you put it on the board.
Otro video excelente, aquí decías que no sabemos pero ya vi el video donde si podemos saber con un osciloscopio :D, la verdad excelente contenido
What if both side of the smd ceramic capacitor has no Beeping noises that come from multimeter?
what happens when a capacitor has no continuity in either way? Is that particular capacitor faulty as well?
It likely means you have not found a common ground to the capacitor.
Hola bob estoy reparando un mother hp 550 y probe tu metodo, en muchos capacitores tenia continuidad en ambos extremos!!! Yo no abri los pad deberia abrirlos??
Sí, debes abrirlos con cuidado para que las etapas se liberen y quedes solo con la etapa del corto. Pero marca, has una lista o toma fotos de los pads abiertos para cerrarlos cuando la repares. De otro modo, tendrás que abrir la laptop de nuevo para habilitar una etapa abierta.
Bob nunca deberian dar continuidad los capacitores en sus dos extremos ? es necesario levarntar la soldadura de uno de sus extremos ? Muchas gracias por tu respuesta. He visto muchos de tus videos y son muy buenos.
Nice video for testing and very clear
Good information and explanation, but your desoldering technique is tricky as most probably it will spoil the surface of the main board by demounting the main tiny circuits from surface.
Hi! It requires practice like all. Even with hot air we can delaminate a PCB. But I use it with capacitors! ...I am just sacrificing the bad capacitor, or inducing latent failures to end on it. The goal is a capacitor sacrifice if it was needed, and to safe PCB. I do not use it with chips, or arrays. The tip I use is flat on one side. It keeps good temperature transfer, and it pulls up the capacitor on one side, while it push the PCB pad down on the flat side. I do not use rounded tips for it. :-)
Thanks for information Bob.
I wanted to know what camera/ USB microscope you used to record this video, it would be very helpful because I am thinking of getting one myself.
I have some capacitors where both sides are not connected to ground. What does that mean?