[SOLVED]820-3115 B - Works okay, but no Keyboard or Trackpad. Fan spins high after awhile.

[gcain]

[SOLVED]820-3115 B - Works okay, but no Keyboard or Trackpad. Fan spins high after awhile.

Not really sure where to start with this one.

Everything around U5701 looks okay. It's interesting that the kb, tp AND sensor aren't working so makes me think it's layer one to jacks. Everything looks clean though.

PRM reset did nothing (just tried it after it worked the other day)
Powerbutton keyboard doesn't work.

External keyboard and mouse are fine.

 

[gcain]

C7800:in2 = PP3V3_S4 = 1.766

Hmmm, short somewhere?

 

[gcain]

Q7803::1 == 0.3v
but
U7970::4 == 3.3
R7919::2 == 3v3.

 

[dukefawks]

That 0.3V and 3.3V are on the same P3V3S4_EN line. It can only be broken or your measurements are wrong.

 

[gcain]

I confirmed my measurements.

If the line were broken I would have expected 0v, not 0.3v. Will run a jumper wire and report back.

 

[gcain]

So I ran a jumper wire from P3V3S4_EN test point to Q7803::1 and all is well.

Still don't fully understand why it wouldn't be 0v and was 0.3v instead.

I have been using a single strand of wire from the camera cable for jumping and it works pretty well.

(Mark solved please)