820-3437 Missing webcam

[TBFix]

I have a 820-3437 board that had some spillage after repair and ultrasonic and test I dont have any camera.

J4200 has
0v on pins 2 and 3 (.324 on diode mode)
pin 4 has 0v and reads short to ground this doesnt change when you access camera.
PIns 5 and 6 0v (.318 on diode).
PIn 8 and 9 have 3.3v
Pin 10 and 11 have 1.7v
Pin 12 have 5v

CAMERA_PWR_EN_PCH is present
PP1V2_CAM is present
PP1V35_CAM is present
PP3V3_S3RS0_CAMERA is present

I have also tried this with a known good screen and camera. Are BCM15700 a known issue onthis model or is there something else Im missing.

 

[2informaticos]

Check L4007/09...

 

[TBFix]

20mv on each

 

[2informaticos]

Did you check CONTINUITY of these coils?

Compare voltage and diode mode readings on data lines with known good working board.

 

[TBFix]

Yes continuity on both are fine and diode readings are same as good board .325

 

[2informaticos]

Check if working board has some voltage on these lines, when webcam connected.
Also try known good working BIOS; test cleaning original ME region first.

 

[TBFix]

I already had clean Me region bios from here to test but same issue
I am getting no waveforms on MIPI_DATA_CONN but am getting one on the good test board.

When inject 3v into PP3V3_S3RS0_CAMERA both U3900 and U2800 get warm I also noticed thunderbolt external video does not work aswell as the webcam.

I removed u3900 snd u2800 as they were getting very hot to touch and then replaced U2800 from scrap board but still not getting external video . I haven't worked on an issue like this Thunderbolt any pointer would be appreciated (I had thunderbolt adapater in and hdmi cable to tv)