Electronics > Repair
Help me find a short on laptop mainboard
naujoks:
I have a VAIO Pro 13, which has a short on its mainboard.
I measured the short across some capacitors and an indcutors, both on the front and back of the board.
I just got a thermal imaging camera and I've been trying to find the short by injecting voltage (1V, 0.5A) on the board.
I put the negative of the PSU on a common ground and the positive on the shorted cap and inductor, but nothing got hot at all. In fact, nothing even got warm.
Did I do something wrong? This is the first time I'm trying to do this, so it's quite possible I made a mistake.
kripton2035:
build yourself a shorty with display (link in my signature)
it's an invaluable tool to find shorts anywhere on pcb.
look at the videos on how to use it.
naujoks:
That looks like a fun tool, but I would like to try using the tools I have at my disposal already, particularly since I just got the thermal imaging camera.
I'd very much appreciate any help with my current problem. I've attached picture of the board for reference.
StrayElectrons:
Normal to have very low impedance due to CPU & GPU section of the processor around power inductors for the processor. Which components you are measuring as short?
Secondly, you can buy used motherboard for not so much money and reactivate the windows and keep data.
Usually the motherboard has a COA key burned into the firmware serial so no need to pay for key again.
Cheers,
naujoks:
I measured a short across one of the bigger black caps and the inductor next to it. Also on some of the very small caps on the back.
I know it's a short that's not supposed to be there because I have a similar laptop on which the said components do no measure as a short.
Replacement mainboards of this laptop are rare and more expensive than getting a complete laptop (around 120 pounds).
I would like to repair this mainboard.
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