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Its time to start providing diode mode readings to all power rails. This may help in identifying shorts.

Probably a bad LCD panel, but could be any of those things. I wouldn't worry about it, until it comes back to you.

if its in pin 1 then the shorts going to be in the Platform Controller Hub. That's shitty luck if it is. Be careful with those probes next time.

Its not that hard. TIn the solder joints in leaded solder, then hot air the area and start to carefully prise when the solder starts melting. If you leave it, its going to come back with headphones not working at some stage.

remove the inductor and see which side the short is on. Pin 1 or Pin 2.

Do you have donor board ? if so just replace the headphone jack. Its 10 minutes work.

Some of us actually PAY in here to provide help....thought about that... 1) Did you check if RAM has correct voltage ? 2) Start pulling those RAM chips off and Reball. I would just replace all the RAM to save time. Of course checking for broken traces is going to be a pain. Good luck.

Probably a bad headphone socket which will need to be replaced. Short pins 1 and 2 on the headphone socket. if that brings back audio replace socket if you want to use headphones again. Also check L6607-8 and detection traces back to U6201

Im seeing a lot of these now. Is anyone here repairing the backlight LED strips in these ?

Probabily with thisboard. Start with heating the GPU to about 100C. Any image ?

Just checking you started with PRAM & SMC reset ?

Ah the reddish screen. I've got a couple in the workshop I have failed to fix so far. All these boards have already been re-furbed by Apple. So far, just done basics, Replaced GPU, VRAM and reballed the mux. Made no difference what so ever. Laptop still fails the VST. If I crack it, i'll...

I just use some shitty £3 adapter from ebay. Have to solder the chip on. Takes 2 mins max.... Although I have nearly pulled the trigger on that $150 adapter a few times.

if you can find a donor with the PCH and bios still on it, that is your first best option. If not, then its lottery if you get a good one from usual places. Once PCH is replaced and board works, we can help you in fixing the bios.

I'd put it down to battery still connected or ESD.

Battery talks to SMC via the SMBUS using I2C protocol. This is probably a shitty battery.

That is shitty luck.....I hate fixing these machines...

Just use it as your own laptop for a four or five days. If it survives deem it good.

Any corrosion on keyboard connector ? Whats U5000 area like ? Any components knocked off or out of spec ?

i'd just do the simple things from here on, since you already replaced C9560. Perform component isolation, check for bad RAM slots. If this doesn't fix it, give it back