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Hi, Last week I tried to upgrade my MacBook pro 13’ late 2011, yet screw touched battery jack and possibly burned the logic board. Now it can not turn on, and there is no green light on the charger. I started to learn the board repair several days ago. Below is what I have now: with only dc pluged:

  1. PP3V42_G3H - 3.49v (is it too high?)
  2. PPBUS_G3H - 0.16v
  3. PPDCIN_G3H - 16.69v (is it too low? actually my J6900 pin1 (PP18V5_DCIN_FUSE) is the same reading)
  4. SMC_BC_ACOK - 0v
  5. SMC_RESET_L - 3.45v
  6. R7010 pin2 - 4V
  7. R7021 & R7022 - 10 ohm
  8. Q7085 pin5 - 0v when only battery pluged:
  9. PP3V42_G3H - 3.49v
  10. PPBUS_G3H - 12.23v
  11. SMC_BC_ACOK - 0v
  12. SMC_RESET_L - 3.45v What do you think causes the problem? Do I need to change dc-in board, or U7000, or both? Is there any other possibility leads to the dead mac? Thanks for your answering! Update (01/16/2018) Hi, I am back again. This time both good news and bad news. First the resistance is back to normal - I measured 2.9 ohms between pin 17 and 18 after I changed the resistor. Second I changed the ISL6259. Visual inspection looks quite good. After I plugged in the charger, the green light turns on but the fan did not spin. So I measured again the PPBUS_G3h - more than 16V! After some time the whole board dead again with no green light. Later I detected a short on PPBUS_G3h and after some digging, it’s the shorted Q7030 and Q7035. I now know the previous Q7030 is shorted. When I took off both transistors, the short is gone. However, the bad news is I accidently ripped off the pin23 of U7000. The picture is attached. I am going to change Q7030, Q7035 and ISL6259 at the same time, but I have no idea how to connect pin23 to the board. Perhaps jumper wire? I have no confidence to do that. Any better suggestions? Thanks in advance.

Your issue is most likely U7000 R7051 and 52 and possibly R7021 and 22. What is resistance between Pins 17/18 and 27/28 or U7000?

I would suggest trying to replace the mag-safe board.