Electronics > Repair
Help me find a short on laptop mainboard
naujoks:
In some places the short measures just 2 ohm.
I also confirmed that it's a short on this board by measuring the same components on the board of the working VAIO, where no short is measured.
I'm using a standard digital MM.
I'm measuring the short on the coil 3R3 and the cap to the right of it, also on on the big 330uF cap to the left of the CPU, as well as some of the smaller caps on the back of the PCB.
RoGeorge:
--- Quote from: naujoks on December 14, 2024, 03:47:08 pm ---That schematic download link is a scam. You have to sign up to places with your credit card. No.
--- End quote ---
They didn't say about credit cards. In that case, maybe ask one of the guys that already downloaded the schematic (from the diy-laptoprepair forum) to share with you what they've already downloaded.
As for the 2 ohms, don't know what to say. The MLCC type of capacitors I was suspecting usually go dead short, a fraction of the ohm, not 2 ohms. 2 ohms might be caused by something else. I'm not sure what to advice farther.
Maybe increase the voltage to 1.5 or 2V, in the hope that a bigger voltage will give a bigger test current, and that will heat the shorted component more, so to spot it with the thermal camera. :-//
Harry_22:
Could you connect the good mainboard to the laptop and make some photos via termal imager.
naujoks:
What would the purpose of that be?
Harry_22:
I like looking at pictures more than reading long texts.
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