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Thanks 2informaticos. No USB activity and no external video. No signs of liquid exposure at video connector, touch bar and no discolored solder/components either. Unable to do DFU anything as I do not have another Mac with USB-C. If there is no other way to DFU I'll shelf this repair for now...

Hi folks, Got a board here that is immaculate but *every* solder joint and every cap/resistor on the board is discolored. So this was liquid damaged and cleaned after. Been out of the game for a while and I primarily work on older machines so no idea where to start on this one. Unit draws...

SMC bypass: hold power button down and then connect power cord? Fan went max speed but it still shut down once the boot picker loaded.

Not sure what an SMC bypass is or how to do that. Google shows me something different every search. SMC reset doesn't resolve the issue.

I have ruled out L3504 and the circuit that comes after that component. L3504 - R3551 and everything in between is OK. With L3504 on the board, it shuts down as soon as Wi-Fi is being accessed, without L3504 (to connect that whole circuit to the J3501 connector) there are no shutdowns. Don't...

It's a combo-module, no way to isolate one or the other on the module side.

Been looking around but don't have a clear picture of where i can find that windows live to make a USB from. Assuming it is GPU related, which component would I go after to see if it's the same problem that affects the 15" models?

When booting from the internal drive, it either hangs at the Apple logo, logo + bar or shuts off. Alt-boot shows me the boot picker and I can select an external drive no problem but once it starts loading the OS (any OS), same problems, this includes ASD.

Howdy, I know of the 15" 2010 model that has a simple fix replacing C9560 but now I have a 17" 2010 model with kernel panics. C9560 on the 17" is not 330µF so can't try to replace that one but before I start looking for a good replacement cap to try out (if not C9560 then whatever the 17"...

Could the SMC somehow be responsible for this behavior?

PRAM resets do not resolve, disconnecting the HDD cable does not resolve. I had already tried component isolation which is how I ended up with the Wi-Fi cable being the problem. Could you explain why the BIOS would be the problem?

G'day folks, Repaired a 3115 with liquid damage and got it working by cleaning up a few small spots of corrosion and replacing U6990. As long as I leave the Wi-Fi and bluetooth disconnected (J3501) the machine runs great and passes all AHT and ASD tests, boots to a flash drive etc. With the...

This was picked up before I could further investigate, can be marked as closed. Thanks for the help 2informaticos

hey folks, Got a 820 3437 that came in for no backlight. Replaced the backlight driver and now the backlight works for a second after the chime, then turns off. Any ideas on where I should start looking for the issue here? The driver works, backlight works but something is turning it off. This...

I've got an 820-00923 with no Wi-Fi. AHT confirms the no Wi-Fi but this machine is newer than what I typically work on so I'm not sure where to start. No liquid damage, no other damage. Machine works great except Wi-Fi. Any pointers? :) Looking at the schematic there is a lot more involved with...

Yeah the UC has sweeping frequencies (one of the larger ones I got from Rossmann). Will keep checking on this tomorrow, appreciate the help so far!

SMC bypass started blasting the fans at max speed. SMC reset calms it down but still original behavior. Tossed it in the cleaner, now fans ramp up and max out when it's powered on, top case no longer responds (power button and can't do SMC reset anymore). CPU gets very hot very fast.

John, I will toss it in the UC today. 2informaticos, what is SMC bypass mode?

This machine came in as "no power", history unknown. Connected to the PSU it drew a charge, fan would spin and CPU got warm. No POST or boot. Took it apart and found corrosion on C0890 and C089, small spot. Cleaned it up and found one of the caps shorted to ground. Replaced both caps and unit...

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