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I have an 820-3536-a macbook pro retina, I get an amber light on the charger, but the computer wont turn on, I am missing pp5v_s4, pp5v_s5 is presant. board was water damaged, thanks for any help
as far as i can tell pp5v_s4 isnt pulsing, but i dont have an oscilloscope. there was some blue along the 1-4 pin side of U1900 and the ground pin of U6100 had some aswell
Look up all the termination resistors in the data lines of U6100 and check them all. Also check continuity between them all. I think there are 16 of them.
the only resistor that i found that was not what the schematic said was r6131, resistance was 77k ohms but theres no resistor on the board there; and its also not labled "no stuff"
Sometimes it is a short that can be worked around, such as in this case: fast forward to 1:30:00 to see me fix a case of 0 ohms to ground on a board with shorted PPVRTC_G3H that is very similar to yours.