[SOLVED]820-2915 No PP3v3_G3H to keyboard connector

[brooke.j]

Water damaged 820-2915 got everything working Backlight, Firewire, etc, Now I need Keyboard/trackpad.

At connector I have:
PP3v3_s4 = .745
PP3v42_G3H = 0.0

Is PSOC USB controller U5701 supplying PP3v42_G3H? Could SMC be a part of this to0?

Im going to reflow U5701 lightly and see what happens.

 

[brooke.j]

Ok and IPD is

PP18v5_S4 = 0.0

This is all while booted to USB with no trackpad or keyboard attached.

 

[brooke.j]

So let me think this out U5805 Gets 5v then out of it comes PP18v5_s4 cuz it's a booster? Right now I have 0.0 on pin 4 of U5805. Do I need to have things connected to get the right voltages?

 

[brooke.j]

Going for the Keyboard. Ok Did some reflowing around U5701 and touched up R7803 Resistor Now I have 1.85 at Pin 30 for PP3v3_s4. On the other side of R7803 I have 3.3 and then 1.85 is that supposed to be that way. It is a resistor.

 

[brooke.j]

Ok So 3.3v s4 Fet can have 3.3 or 1.8v? Maybe that's what's messing me up?

 

[dukefawks]

R7803 is 0 Ohm so there should be no voltage drop there. R7803 is dead, check for a short first of course. No 3V42 at the connector will be a corroded trace, run a wire.

 

[brooke.j]

[SOLVED] R7803 ZERO ohm Resistor just decided to start resisting. Made it a wire. Case closed.

 

[dukefawks]

3V42 present on the connector too now? If not then your left shift/alt/ctrl will not work.

 

[brooke.j]

3V42 present on the connector too now? If not then your left shift/alt/ctrl will not work.

Yes Thank you it was.