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ofc not while powered. I'll solder a small wire between R7051 pads today and check F7040. My hot air station is pretty barbaric, which I think may be causing some troubles. I'll get better equip soon. What do you think of low voltage on R7001, what would be cause? 3v42 is present, all other...

Now I'm only getting a dim blinking amber light when magsafe is plugged in--C7050 is off the board, R7051 doesn't seem to be resisting properly now as well, measuring only around .6ohms instead of 2.5. Pin 8 is still very low, not sure exactly where to proceed. What do you mean replaced directly...

27/28 is 20ohms, which I know is a good reading. 17/18 I'm not getting anything, but C7050, R7051 and R7052 all read correctly (3ohms) for their resistance. Diode mode shows very low readings for all three, however, I'm thinking of replacing that capacitor. At first I thought the traces could be...

Checked the pins, 9 was at ~30.5mv, which was about ~3mv lower than a working board, and 15 was at .1mv, which was .2mv lower than my working board. Can't get a great reading on pins 17/18, but pins 27/28 are normal resistance. R7052 and R7051 read correctly, as does C7050. Thinking 17/18 may...

Hey! This time I actually have a 2012 13" board, 3115-B. Similar problem to last time, except this guy gets no power even with battery plugged in. When AC adapter is attached, sleed LED lights and fan spins for a quarter-second, then rests. Board does power on in SMC bypass mode. Board had...

Yeah, it was R7052!! Thanks a bunch guys! While I was taking it off I accidentally ripped the solder pad, so I ran a jumper wire. You guys are the best :) thanks again!! Now I just have to resolder a display connector since I had relegated this guy to parts earlier... lol :)

Hard to get a good read on it, but my meter is saying 300ohms... seems a bit off. Should I try replacing C7050?

In resistance mode I checked C7020, since pad 1 was pin 27 and pad 2 was pin 28--I got 20ohms, but I'm guessing that's just the inherent resistance of the capacitor. You think it's either a bad U7000 or bad SMC at this point? I'll get those probes tho!

It does stay on in SMC bypass mode! I should remember to troubleshoot that when I see problems like these. So I did a bit of further troubleshooting: Tried multiple batteries before, all of which didn't work. Got a fresh new battery with a charge today tho to test, the machine boots just fine...

Sorry, it's an 820-2936-B board! Dealing with so many 2012s lately it slipped my mind. G3H bounces between 12.6v and 4.0v, PWRGD starts at ~3.2v, holds for a few moments and then drops to 3mv bc of the power cycle. 3V42 is stable. Maybe U7000? 5V_S3, 5V_S0, 3V3_S3 AND 3V3_S0 are all present...

EDIT 820-2936-B board, 13", board receives power well but when power button is pressed the fan will whir and the sleep light will come on for a moment, then abruptly cut off. When I keep only the charger plugged in instead of the battery, eventually after many cycles of doing the above the...

:( So I'm guessing since the board was getting power when U7600 was burnt out, it fried the CPU? Dern. Would still have liked to know what caused that chip to pop in the first place! Didn't see any signs of water damage on the main board at all.

Nothing as in 0.00 in diode mode, still 0.6 in resistance. I get readings in diode mode for other inductors, so I'm guessing the 0.00 is no good!

Nothing when on diode mode with both chips removed. So you think dead? Why do you think that?

Oh! Good to know! What number should I be expecting normally then for L7630? I'll see about removing Q7630. edit - removed Q7630, still getting around ~.6ohms on the board. Dead? and if so why is that your conclusion?

Removed U7600, checked resistance on L7630--got .6ohms consistently. Schematic says .011? Tested other inductors to make sure my multimeter wasn't wonky, was getting .459 on both L1290 and L1295 where schematic says .221. Looks like they're all related to that powerline, tho, and I've never had...

Hey! First post here, hope to be an active member of the community once I become a bit more experienced. :) 2015 13" MBAir board, had some liquid damage on the I/O board and no light on magsafe even w/new I/O cable so I bought a new I/O board. No viewable liquid damage at all on main logic...