macbook a1989 820-00850 no camera

[PITERPENY]

Hello friends. There is a problem, the camera does not work. Replacing the display did not bring results. The problem is on the board. Please tell me where to look?

[PITERPENY]

[mon2]

https://boards.rossmanngroup.com/thr...-camera.64340/

[PITERPENY]

https://boards.rossmanngroup.com/thr...-camera.64340/

Thank you for the link. Unfortunately, the person never answered whether he managed to fix it. Restoring via DFU did not help me. Neither did replacing U8502. Any other thoughts on what could be wrong?

[mon2]

What is the voltage to ground of SEP_CAM_DISABLE_DFF_L on U8502? This is the select pin for the camera.

If L = Camera Disable
If H = Camera Enable

[PITERPENY]

SEP_CAM_DISABLE_DFF_L=1.8V(diod=0.577)

I have seen several threads with this problem on boards.rossmanngroup.com and as I understand their repairs were not successful!

[mon2]

The display is 100% compatible with this chassis?

Is the camera being detected by the logic board and just not working?

What are the voltage to ground measurements for:

I2C_FTCAM_ISOL_SDA
I2C_FTCAM_ISOL_SCL

The enable voltage is correct to enable the MUX. After the mux is enabled, the rest is about the MIPI lines to send the data out of the camera to the host board (MIPI CSI interface).

Be sure the EMI filters are present and soldered. You can test each in DIODE mode (without power) - measure across the part. Each should be ~0v in diode mode = short. Otherwise, the EMI filters are defective or not soldered properly.

[PITERPENY]

I2C_FTCAM_ISOL_SDA=0.576
I2C_FTCAM_ISOL_SCL=0.567

EMI filters OK=0v

[mon2]

Is the camera being detected by the logic board and just not working?

[PITERPENY]

Is the camera being detected by the logic board and just not working?

no camera is not detected. I put the board in a known working case with a 100% working camera, but the board simply does not see the camera. At the same time, the light sensor, which is on the camera module, works properly. I will note that there is not even an attempt to connect to the camera. That is, there is no green light blinking. It is as if the camera simply does not exist. I think that you need to try replacing the T2