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Im thinking the same thing. hate to call customer in this situation and add the price. cost of this chipset is around 60, should've charged more

hi guys, having a a1502 board, 820-4924. machine can't boot into any OS, kind of like the sensing circuit issue slow. option+D to run ASD and had a result PFF004"there may be an issue with the fan" I replaced the fan and have the same result. thought can be the issue with the fan circuit,so...

smc_lid=3.3 yes, tried external but still no image

hi guys having a 820-3330 board. pretty clean and well kept condition,nothing spilled on it. it can power up,all power rail present, you can hear the chime, but nothing on screen. not the no back light issue, it's no image at all,same as external. as for measurements, PPVCORE_S0_GXF = 0.8-0.9...

fixed! it is a broken trace around q5310 area, thanks a lot guys!

And yes, it is genuine apple charger that i had been using to fix machine. tried another DC jack as well

hi, have this a1297 machine, came in with the "famous" video distortion problem. so go ahead and replaced the GPU. video back to normal. then found another issue, it will run very slow , like the sensing circuit problem kind. but the fans don't spin high speed. so anyway, ran ASD, so...

alright,thanks man

yes connected left and right speaker already. but no beeps at all, either with RAM or without RAM

hi guys, having a 820-2915 board. board looks never touched before, no liquid spilled. problem is no video, check all rails, basically all power present.including cpu vcore,gpu power no beeps at all, either with or without ram. suspected the GPU ,which is a common problem of this model, then...

did you guys figure out the problem? having an exact same board here and would appreciate any advice. having no clues at this moments., thank you

I replaced u7000 as well and q7060 , Now it doesn't burn the mosfet any more, but can't power on with battery only. the system can recognize the battery and see the percentage,but can't charge, it shows battery 50%, but can't run on battery once i unplug the charger. check the current sensing...

Im having a 820-2330 logic board,a1286. the problem of the machine is that, it can't charge the battery. it shows "X" sometimes and "0%" sometimes. wanted to check those two SMC to u7000 signal and see if they are 3.3v but always before those, for this board,once you connect the charger and...

you are right man, it is the SMC, replaced it and boots up now doing testings. you can close this. thanks a lot!appreciate it

smc_adapter_en=0v , would that be normal when no green light? or should be there even no green light?

yes I tried couple magsafe board already ,same result, using genuine apple 85w charger

ACOK=3.3 smc_reset_l=3.3 ppbus=12.12(12.11 sometimes)

also ,like to add, small area around q5310(not exactly on q5310) but small area around that was spilled,not sure if problem would be something around there. but they do look fine after cleaning

[SOLVED]2012 A1286 820-3330 no green light, PPBUS_G3H AND PP3V42 Present ,liquid spilled Hi, having a 820-3330 board, got spilled on 1.back light circuit 2. a bit on u7000 and u8900 and a bit every where, but really nothing much screwed up. cleaned off, soldered new back light connector(i know...

yes tried both already , maybe different bios? it's the same for 2015 air as well