This one was a tricky one, Customer said laptop turned off randomly with use.
He mentioned water damaged so i fixed everything i saw yet this problem persisted where if i used the keyboard it would sometimes restart with no warning.
MOSFETs were fine, power lines were fine, CPU temps were not fine though.
Ran MEMTEST, switched RAM sticks for different ones, couldn't find ****.
Heatsink was acting weirdly so i decided to push it to see if it was making contact because 90°C with memtest was weird, heatsink was too hot to touch so it was indeed 90°C+, both over the CPU and next to the fan.
BUT when i touched it i noticed it restarted, decided to try again and touch it with a screwdriver, CPU is loose, solder is bad and it only works because the heatsink is pressing it down...
The heatsink pipe bursted somewhere, could find some rust spots, maybe the last guy that checked it out bended it too much and cracked it?
I have no idea how im going to fix this one except adding some double sided thermal tape and pads with a 40x20x10mm heatsink over the CPU so it doesn't melt.
One RAM slot is FUBAR too, looks fine pin, pad and trace wise, but something under the CPU is damaged and it refuses to work, wont POST at all if i use the second RAM slot.
Battery is Fubar, looks like 3 pillows at this point, it still good enough to keep the laptop on though.
HDD was a Toshiba MQ04, dead, horrible drives, Toshiba version of the Seagate Rosewood.
This is a No fix but i need the money so im not giving up on this one, will probably charge him $30.