MacBook Air A1466 webcam not detecting

[mferna14]

I am working on a MacBook Air A1466 (Board # 820-00165-A). The initial problem was liquid spill near the ROM chip & after cleaning & re-programmed (ME Region cleaned) all worked fine without any problems. It boots up fine, & the only problem now it is not detecting the Webcam. 1st I tested with a know good camera, same issue. I was reading forums & they say about this resistance R2042 (0 Ohms) & U1900. There was corrosion on R2042, I replaced the resistor & even U1900 on the safe side. No Luck. L4007 & L4009 are perfect too. Then I had one Known good U3900, replaced it, no luck at all. I get 5V on the webcam connector & it seems to be fine too. What could be the problem???? Thanks

[mon2]

Re: MacBook Air A1466 webcam not detecting

Confirm the voltage readings of I2C_CAM_SDA & I2C_CAM_SCK.

The camera is a MIPI device and needs I2C to be working for the register configuration and detection.

What is the voltage of CAM_SENSOR_WAKE_L_CONN ?

[piernov]

Re: MacBook Air A1466 webcam not detecting

https://logi.wiki/index.php/BCM15700_Camera

[mferna14]

Re: MacBook Air A1466 webcam not detecting

Thank you very much mon2 & piernov, you guys are really very helpful. I will check these volts today & let you guys know, where the webcam is acting upon.

[mferna14]

Re: MacBook Air A1466 webcam not detecting

Confirm the voltage readings of I2C_CAM_SDA & I2C_CAM_SCK.

The camera is a MIPI device and needs I2C to be working for the register configuration and detection.

What is the voltage of CAM_SENSOR_WAKE_L_CONN ?

I2C_CAM_SDA 1.79V & I2C_CAM_SCK 1.79V & CAM_SENSOR_WAKE_L_CONN 0 Volts even when the camera cable is attached to the logic board connector. So this CAM_SENSOR_WAKE_L_CONN should also be 1.79v because I am getting 1.79v on R4005 (Both sides 1.79 & 1.77V) but it's NOT reaching R4031. BUt I see in all the board R4030 in not present???? Why?? There might be a circuit break somewhere, I have to check this. Just Mon2 please confirm the voltages, am I right??? Thanks

[piernov]

Re: MacBook Air A1466 webcam not detecting

BOM option CAM_WAKE:YES not populated, CAM_WAKE:NO populated instead.

[mferna14]

Re: MacBook Air A1466 webcam not detecting

BOM option CAM_WAKE:YES not populated, CAM_WAKE:NO populated instead.

piernov, seriously I did not understand "BOM option CAM_WAKE:YES not populated, CAM_WAKE:NO populated instead" can you please explain in detail please.. Thanks

[piernov]

Re: MacBook Air A1466 webcam not detecting

[mferna14]

Re: MacBook Air A1466 webcam not detecting

Thank you so much for the Explaination "Piernov"., really very help, so I think in the logic board which I am working the resistor R4030 should not be populated???

[kevingill]

Re: MacBook Air A1466 webcam not detecting

I've seen MacBooks where a bad battery stops the webcam working.
Might be worth a quick check or unplug battery.

[mferna14]

Re: MacBook Air A1466 webcam not detecting

Good idea, I will try this too. Always tested it with the battery connected, maybe this might help removing the battery first. Thanks anyways

[mferna14]

Re: MacBook Air A1466 webcam not detecting

Battery disconnected, but still the same camera not detected... Tomorrow will check in detail. Thanks for the tip.

[mferna14]

Re: MacBook Air A1466 webcam not detecting

OK., I am still on this "webcam not detecting", have not given up. I replaced component with know good ones. Replaced the U3900, U1900, U4000 & SMC U5000. The only problem was there was liquid spill near U1900, & then I replaced the CAPs & the resistors too around U1900. But still no luck. I measured all the voltages on these points & all are present. (PP1V35_CAM 1.35V, PP1V8_CAM 1.8V, PP3V3_S3RS0_CAMERA 3.3V, PP1V2_CAM 1.2V, PP0V675_CAM_VREF .67V) All these voltages were taken near U3900 & all present.. Where am I going wrong??? I reset the SMC, & re-programmed BIOS & on the safe side replaced with another known good webcam, NO LUCK AT ALL. Still gives No Camera Detected. Any Help or Tip will be a great help. Thanks