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Well well, I found what the issue was after going over the whole board and I thought I'd share it with others so that if anyone has this same issue, they'll have the solution. The solution was the power adapter not pumping out sufficient amps, so it would "starve" the motherboard from current, and the mosfets would try and compensate and heat up. When I found the issue, used another power adpater and bang, everything back to normal. Will now troubleshoot the power adapter. Cheers!
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Wait, before you clean it do post nice clear and crisp photos (sorry to say, but your photos are blurry) so that we can help you identify the areas to fix. From the blurry photos you posted, I spotted a few spots that look suspicious. see attached. Only after having identified all areas both sides that might have been affected will you have any hope of getting this thing back to life. After having identified all areas (which we can help you with with some decent photos) then do what Mon2 suggests.1 Photo
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Checked all the caps that seem to be on the +VDDCR_VGFX and +VDDCR_CPU rails, and didn't find any suspect. None of them seem to be shorting and I examined them with a microscope and didn't see any suspects. As for the circled mosfet on my previous post, I was mistaking because it is right under the 2 original mostfets that heat up, so this one is fine..it is the 2 on the top of the motherboard that get blazing hot.
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Hi Sephir0th,
Can't seemto find PU8101, maybe I don't have the right schematics? Also, I am attaching a photo of the back of the MB and the circled mosfet M3054 also heats up as much as the front ones. When I turn of the motherboard, the resistance between gate and source is 2.1 ohms?
I replaced that mosfet, but get the same result.
As for heat, I have a thermal camera that I use with a macro attachment, gives me perfect readings.
Sort of lost now that I can't find PU8101??...1 Photo
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[
QUOTE=Sephir0th;n3231539]
To simply say "CPU is good" is not sufficient and possibly not the correct assumption in addition.
There must be a reason why the the buck converter is getting hot. And if it doesn't have something to do with the buck converter then it originates from the load (APU).
A Inductor almost never fails end even if so, it is easy to confirm. More or less the same applies to ceramic capacitors. It is a absolute rare case that they will fail without a straight internal short of the layers. However, it doesn't sound...
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Scorching hot mosfets on Asus X555Q motherboard - can't find the cause
Hello everyone,
I am reading temperatures above 105C (221F) on mosfets PQL8104 and PQL8103 and the board is operating fine until it goes above 105C and then it shuts down. Cpu is ok.
So can't figure it out. Attached is photo of motherboard, the schematic section showing the culprit mosfets and the whole motherboard schematic. I changed PL8101 thinking it may be bad, same results. I tested out of circuit caps PC8117 and PC8118 and they measure fine.
So I am at a loss to know what else to check to try and identify the source of the problem
Any...2 Photos
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Dell 15-3537 motherboard part identification
Hello everyone,
Trying to identify the following part J7 FL M1R in the photo which is on one of the power circuits on a Dell 15-3537 motherboard. Went through the SMD code manual but couldn't find it and google doesn't either.
Help please and thank you
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-tempid":"temp_329074_1709092047141_674"}[/ATTACH]...
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Re: 12V 10A CCTV camera system power supply pulsating
I checked almost every component, changed the output capacitors, etc. Redid all soldering and even changed the PWM chip again just to make sure. Same symptoms.
Starting to think there is something wrong with the transformer but did check that too and it's a complete mystery!...
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Re: 12V 10A CCTV camera system power supply pulsating
Ok, so I gave this thing a last shot and redid all the soldering on the entire board thinking it might be the solution, but alas, no still the same erratice voltages. On the startup cap, I get between 11.6V to 15.2V jumping around in between.
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Lenovo P51 motherboard component id
Hello everyone,
I am trying to identify the component in the photo on a motherboard of a Lenovo P51 laptop. It is right next to a coil on one of the main power rails. Any help would be appreciated!
Thank you!...
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Re: 12V 10A CCTV camera system power supply pulsating
Hey Harp, I appreciate your help and the effort in trying to diagnose this, but I am at a point where it's almost a no go with this thing! I think I'm going to try what Alimash suggested and if that doesn't revive it, well it will have been a long adventure..I'll keep you posted on my resoldering of the whole board.
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Re: 12V 10A CCTV camera system power supply pulsating
Hello everyone, sorry for the delay in replying, have been extremely busy at work and was just completely exhausted by the time I could get to work on this. It's the weekend now, so here goes, measurements of all ic legs without mosfet in AC setting mv:
Pin 1 - 0mv
Pin 2 - 0mv to 478mv jumping around in between randomly no fixed delay
Pin 3 - 0mv to 622mv jumping around in between randomly no fixed delay
Pin 4 - 0mv to 462mv jumping around in between but synchronously, like it was timed
Pin...
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Re: 12V 10A CCTV camera system power supply pulsating
Ok, so took the readings on the PWM without the primary mosfet in and fixed the suspicious solder joints (I think I've now reflowed the whole board ):
Results
Pin 1 - GND
Pin 2 - .1V to 1.2V jumping around
Pin 3 - 16V to 19V jumping around
Pin 4 - .012V to .263V jumping around
Pin 5 - .2V to .86 V jumping around
Pin 6 - 0V
Pin 7 - 12.4V to 15.7V jumping around
Pin 8 - .292V to 1.18V jumping around
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