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DCIN_G3H is 18.5v, this is with a lab PSU and genuine Magsafe

Hi all, have an 820-00165 on my bench that won't turn on, has no green light and pulls 42mA from the power supply. I measured PPBUS_G3H as 0.6v and PP3V42_G3H as 0.1v, but I'm not sure what to investigate from here. No super obvious spots of corrosion or gunk anywhere.

Both were very low, the caps and were good but looking closer at U7100 revealed some nastiness under the chip. Replaced that and all is well! Thanks so much for the advice! :)

Here are those measurements: U7090 1 1.24v 2 3.38v 3 7.03v 4 3.39v 6 17.86v 8 17.89v U7100 1 0.004v 2 18.22v 3 4.35v 9 0.02v 12 3.32v 13 3.29v 14 0.02v 15 0.14v 17 1.94v 19 1.58v 20 3.44v 27 17.78v

Measured from surrounding components Pin 1/2/3 18.46v Pin 4 6.76v Pin 5/6 18.46v

Just got back from the ol' Best Buy with a genuine Magsafe 2 85W, but even with the proper charger it still pulls the same amps and same measurements on those lines. Seems very wacky.

That's actually a good question, this cord end may only be from a 60W now that I think about it. I'll pick up an original 85W charger today and report back!

Thanks! I don't get 3V42_G3H at all, and just the smallest trickle (meter shows between 0.001-0.004v) on PPBUS_G3H, 3V3_SUS and 3V3_S5

I have an A1398 820-3787 board that came in not turning on. It pulls 91mA from the power supply and the green light comes on but nothing else. No signs of any huge liquid damage on the board, all the indicators are still white and I can't see any corrosion or obvious spots under the scope. Very...