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The board seems to be dead now. Will go back to basics and measure on all the rails. Something seems to be warm around the SSD jack, but I can't find exactly where it is.

PPVCC_S0_CPU is 0V too.

Doesn't perform an RTC reset, fan turns on to about 50% throttle, after a short while it goes to 100%. CPU Stays cold, checked for PPVCOMP_S0_CPU and it's 0.2V.

You might have been on the right track with the new DC Board. Unfortunately it started the single RAM beep, so I've shelved it until later. Possible power related, going by the single beep.

I can't see SMC_LID moving when it power loops. SMC_LID is 3.4v when off and 3.363 when on. It does move around a tiny bit when it's running.

Nothing is plugged in. Just bench testing at the moment.

Trackpad connector looks clean. I fluxed and heated the SMC, same behaviour.

Going to replace U7501. Solid power going in, and everything coming out of it is fluctuating.

Should I just remove the sensor and see? Your intuition is usually fairly accurate.

I have nothing plugged in, bench testing. J6955 looks nice and clean

Customer said they returned from holiday and it was dead. Green & Orange light behave as expected. I can hear a soft ticking when I connect power. Only corrosion was on C3532 and C7518 was corroded off the board. I get 40mV at R7547::1 & ::2. PPBus = 8.59v PP3v3_S5 is up and down like a...

Customer said laptop was dead, no damage to it besides being a bit old. The board was clean and the only damage was some corrosion on a TP on the trace from U4900::40. Behaviour; The board will sometimes boot and is sometimes completely dead. I have seen the screen brightness going up and...

Are there any missing off the list? Anyone know which ASD for an early 2015 MBA 11"?

I couldn't find a list of which ASD goes with which machine. Thought I would post what I have here and then maybe everyone could help keep it updated. (If this is against forum rules, just remove the post) ASD 3S108 iMac (Early 2006 17-inch) iMac (Early 2006 20-inch) MacBook Pro (17-inch)...

Diode mode is practically 0.000v.

I got the board in under and hour and it went straight into the UC or I couldn't work on it. Only corrosion I can spot is around C7622, C7317 and C7202. They're all HS_COMPUTING pretty much and all measure 12.58v U6100 looks good and does the jack. PPVCC_S0_CPU (Is that VCore on this board?)...

I can actually pick up a pulse on L7520 when I first connect power. P5V3V3_VREF2 == 1.99v, is that right?

I don't have access to a scope unfortunately. U6100 and the J6100 look great and beep out ok. SMC looks spotless, even probe points aren't discoloured. The only hint I could see is it looked like there was grime around the Camera chip (U3900) so I sent some flux under it. Resistance to ground...

It was soaked. Board is in okay shape considering Green/Orange light okay. Originally I was only getting 1.6v on PBus. Sent it through the UC and now PPBus is right, still no power. Voltages in no particular order: PP_VRTC_G3H = 3.4v PP3v3_s5 = 3.3v PP5v_s5 = 5.02v PP3v3_s4 = 0v PP5v_s4 = 0v...

I have been over this board several times now and can't see any corrosion, it's spotless. :'( PPVCC_S0_CPU seems to be cycling too, my DMM picks up a spike every 10 seconds or so. Guessing it's missing ones in between. Is there anyway to isolate which side the issue is occurring on?