820-00840 No Webcam

hambook

Member
Hey all, having issues with a stubborn 00840 board. Came in for liquid damage and a new screen, repaired the liquid damage and the board is working great except for the webcam. In system report it doesn't show up at all, tested with a known good display assembly. ALS does work however. I checked all the components between J8500 and U3900, and everything is in spec according to OpenBoardData values in FlexBV. Also checked all the surrounding components around U3900, same thing. What else should I be checking next?
 

2informaticos

Administrator
Staff member
In page 37, apart of small coils, appear some caps to ground.
Check if any is corroded.
Compare diode mode to ground readings on camera lines with good board.
There is an R/C pair on page 66 too (for SCL/SDA).
 

hambook

Member
Did a double check on my initial measurements and I found that PP1V35_CAM is missing. I have CAMERA_PWR_EN. CAMERA_RESET_L is not low. What else do I need to get this rail to come on?
 

2informaticos

Administrator
Staff member
1V35_CAM is generated by U3900.
Check first diode mode to ground.
Be sure all related components are good.
If all OK, change U3900.
 
Last edited:
Top