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Thanks very much Piernov. I wish I had known that before I ordered new ones, but live and learn! Regardless, the burned MOSFET doesn't seem to have been essential, as the computer is now working well even without a replacement. The fan problem was caused by my failure to reconnect the GPU...

FYI, the entire first page of results on Google for HWMonitor are for other programs named HWMonitor (for Windows). I would refrain from giving this bad advice in the future.

Sorry-stupid question. Where do I get HWmonitor? Is it built into MacOS?

Good news! It boots! The problem was that PP1V5_S0 was shorted within the j3400 cable itself. I noticed that the short was present even if the cable was only hooked up on one side, so I replaced it. New question: The fans are running at full speed all the time. Is this an SMC problem maybe...

Thank you. I will use that method to simulate the power button in the future. However, LIO is connected at J6900 and at J3400. I believe only J6900 should be needed for Magsafe light. But when J3400 is connected L7620 is shorted to ground, when J3400 is not connected, L7620 measures around...

The situation has deteriorated, but I am not giving up yet! First of all, it now seems that PP1V5_S0 is shorted to ground. I remeasured on either side of L7620 and I get around 0.4 ohms. I plan to see if any capacitors on that circuit get hot to see if they should be replaced. Two more things...

Hi, I measured the resistance to ground on an equivalent part to L7620 on a mid 2010 macbook pro logic board (L7630 on an 820-2850-A) and I only got 16 ohms resistance. 16 oms is pretty different than the 425 I measured on the 820-2101-A. Could this be a source of the problem?

On either side of L7620 I get 425 ohms to ground but I have no other board to compare with. I am working on following your other advice, but I need better equipment and supplies, which I've ordered!

So just to give an update, I was able to remove C7615 from the circuit and on my multimeter, it shows an increase in resistance until it hits open line. I think that means it is working ok. Should I replace it anyway? The resistors are still in circuit but I think they are measuring ok...

Thank you! I will do this and report back.

Hi, I'm a total novice at this stuff so please be patient. I took apart a working non-unibody MacBook Pro 15 inch (probably vintage at this point) to reapply the thermal paste and to blow out the dust. When I tried to turn it back on, I got a green light on the charger and the HD spins up, but...