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not the MUX, tried replacing it previously, exact same issue after replacement . this model is hell of a headache, I tried everything but no luck

no CPU Vcore plusing , check all other voltages jump around but CPU vcore is nothing , 0 all the time. check R7402/03 are good resistance and traces are good

having a 820-3115 board,minor spilled around u2600 area and near area. so replaced u2600 and ultrasonic cleaned the board. everything looks cool , no corrosion. but board still the same condition when it was sent in. 1/4 fan spin, spin off, then spin on then off , repeat again and again. check...

yes, ppbus actually happened to be normal for a like a second then falls . same as pp3v42

yes, ppbus actually happened to be normal for a like a second then falls . same as pp3v42

and it works fine with charged battery

my bad,in fact pp3v42 doesn't present most of the time when using genuine charger. even on F6905 there is only 2v , so saying even the charger is not outputting correct voltage? detected a short?

just replaced q7080 and no change. R7005 trace and resistance checked all good, and again, it works fine with those fake chargers somehow

yes tried with a known good battery been using for repairs. ppbus around 9v. the SMBUS_SMC_5_G3_SDA jumping around 0.2-3v with or without battery. makes no difference

having a strange 820-2915 board here. previously it was fixed for the GPU replacement. and worked and tested. 2 weeks later customer returned and said no power at all. so we checked, the machine can power on with DC power supplier or fake knock off charger. but not apple genuine charger...

machine got liquid spilled. no power , big area spilled and fixed. power on then got the typical battery not being detected with "X" want to mention first, q7155 was shorted and bad, replaced. (previously board can't power on when battery inserted) . ok , so SMBUS_SMC_5_G3_SCL=3.3v stable...

r5280 and r5281 were checked. don't see anything on the connector. but even I removed the SMC, the diode mode to ground resistance is still not right . still 600+ on SMBUS_SMC_BSA_SDA normal should be 400+

Diode mode,good battery for sure,tested

820-2915 ,battery "X" not being detected, not the simple cases usually encountered Hi guys,having a strange 820-2915 board giving me headache. problem is battery not being detected, thought should be a piece of cake as fixed a lot previously already. usually only 3 things , which all had been...

don't waste your time, this pattern is game over. I tried MUX, VRAM, GPU. you will still get the same result, I will vote for the problem on PCB

I had a cleaned ME one, just changed the SN and flashed, tested all fine. still wonder how a good machine would have the bios crashed all a sudden though, searched online a lot but didn't seem to find the answer? do you have any clues? thanks

you are right! I flashed the bios and it booted up all the way and worked. thought about it the first place and thought APPLE's bios doesn't crash much as other brands. rarely seen .(maybe 2 or 3 so far for these years) I do wonder what made the bios crash?? (since i don't think there is...

that's the tough part, looks perfect fine physically, and machine seems never got worked on before. we do see a dot or two of greenish stuffs on the side, but most likely just caused by the moisture having tough time with this one, not sure if should risk replacing the PCH

tried that at the first place already, not response to PRAM reset

YES when no ram is inserted, one beep