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Replaced U5805 and it began working again.. Thanks!!

Plugged in voltage drops to 0.0v but unplugged remains at 3.2v

Disregard last comment... I have 3.2v where pp18v5 is supposed to be

PP18v5 is actually not present.. starting to troubleshoot and noticed pp5v_s3 is shorted.. Checking around U7201 now

So I have a 17" Pro here that has minor water damage near the trackpad but doesnt appear to have gone near the board. I replaced the trackpad as well as the cable twice and the trackpad is registering a click just fine but the cursor doesnt move. I have tried external bootables and verified the...

Just to verify, you tried with everything unplugged except fan as Louis said? I've seen miscellaneous other bad parts cause this issue.

ahhh true... Not sure why i didn't think that through more haha. Well now everytime I press the power button the device SMC resets (according to the magsafe) rather than turning on. The only spot with noticable corrosion was near the SMC and I sure as hell hope that that isn't the issue.

Would jumping pin 11 of J5700 to SMC_ONOFF_L pad fix this?

So I have a Macbook Air here that was mildly water damaged, ran it through the cleaner and everything worked, even booted up except the trackpad. So I replaced the trackpad as well as the trackpad cable and now it won't power on without shorting the power pads on the back of the board. Once that...

Does it power back on again on its own after shutting itself off?

Turned out to be LP8550... Was trying to not have to replace the chip cause I don't have anymore in stock except doner boards which I don't necessarily trust.. but I grabbed one from another board and sure enough backlight is back.

So I've tried a whole new known-good top panel and still has no backlight, I guess this confirms a board issue. D9701 has 8.2v on it so i know power is getting through now but isnt this supposed to be a higher reading? Diode mode reading is 0.551.... from my experience this could be SW_0 and SW_1 ??

I have an image just no backlight Update: Well I feel really dumb now. Wasn't aware that the LCD had to be plugged in for it to pull power through. My main question was more specifically how much lower it had to be in order to open. Wasn't sure if it was as low as 1v or as high as 6v

So this project has been a little disasterous for me so far.. Was a routine Macbook Air LCD-only replacement (done plenty before) but after installation of a new LCD the backlight appeared to be out (could see apple logo on the LCD). I replaced the backlight strip because i had some scratches on...

Yeah, and thunderbolt ports are powering thunderbolt drive as well

So I've gone back and started testing some of the rails listed below: PPBUS_G3H -> 12.5v PP3V42_G3H -> 3.44v PP5V_S0 -> 5.13v (but it jumps around ocassionally) PP3V3_S0 -> 3.3v PP1V5_S0 -> 1.5v PP1V05_S0 -> 1.05v PPVCC_S0_CPU ->1.69v Everything seems pretty normal but im still not getting an...

So theres no display on the screen but I appear to have entered S0 state now from what I can tell. I think there may have been a cold joint under U1950 and when Louis asked to look under it and I put it back on it fixed the problem. Right now PP3v3_s0 intermittently cuts in and out...

ALL_SYS_PWRGD is at 3.3 now and the fan is spinning consistently? Not sure how this could have happened as I havent done anything since my last comment... I guess I'll plug it back up and see what happens

pp5v_s4 jumps to 5.13v briefly while the fan starts to spin and disappears when the fan stops.... U1950 looks fine. I removed it but no signs of corrosion or damage underneath

So on this wine damaged board... I have pp3v3_s5 and pp5v0_s5 rails but PM_SLP_S5_L is missing on u8170 causing it to be unable to enter into S4 state. PP3v42 is present and I have charger light. I narrowed it down to something near U1950 I believe which has 3.42v on pin 8 and 0.19v on pin 2...