820-3332, No Camera

[SMMRepair]

Working on an 820-3332 board with no liquid, but no functioning camera ("no camera detected"). I checked the voltage at pin 4, and it's present (5v steady). However, my diode reading for pin 4 is off; it's reading .400 compared to .470 on a good board. I checked L3508 and it seems fine (.000 diode, no resistance across). It doesn't look like this circuit is very long, and I can't figure out if there's anything between the connector and the PCH that I can check? Connector itself looks fine, and there's no damage or anything to the board.

All help appreciated!

 

[dukefawks]

It is a simple USB device. Measure both USB data lines at the connector on diode mode. I assume you tried a known good camera

 

[SMMRepair]

Hey Duke, thanks. Yes, it was tried with a known-good assembly/camera (two, actually). Same issue on both, "no camera detected", etc. In diode mode, I get:

pin 1: .000/gnd
pin 2: .470
pin 3: .470
pin 4: .400 (.470 on a good board)
pin 5: .589
pin 6: .589

Diode mode readings match a known-good board on all pins except pin 4, which is lower than it should be I believe.

 

[dukefawks]

Any other USB devices not working like BT or ports? If all other USB is ok, check if diode mode on pins 2 and 3 change when plugging in the camera. Could be bad connector or L3508.