820-00850 no camera

[Sr. Robot]

Hi, i got a 820-00850 with no camera, OS says camera not detected.

Tried known working LCD with camera and flex cable, same thing.

PP5V_G3S_ALSCAM_F: 5.1v
PP1V8_G3S: 1.8v
SEP_CAM_DISABLE_DFF_L: 1.8v

R5336 and R8508 look good and measure all right.

Diode mode to ground on data lines:

I2C_FTCAM_ISOL_SDA: 0.444
MIPI_FTCAM_CLK_ISOL_FILT_CONN_P: 0.435
I2C_FTCAM_ISOL_SCL: 0.433
MIPI_FTCAM_CLK_ISOL_FILT_CONN_N: 0.430
MIPI_FTCAM_DATA_ISOL_FILT_CONN_P<0>: 0.426
MIPI_FTCAM_DATA_ISOL_FILT_CONN_N<0>: 0.435

MIPI_FTCAM_CLK_P: 0.408
MIPI_FTCAM_CLK_N: 0.398
MIPI_FTCAM_DATA_P<0>: 0.405
MIPI_FTCAM_DATA_N<0>: 0.416

MIPI_FTCAM_DATA_ISOL_P<0>: 0.425
MIPI_FTCAM_DATA_ISOL_N<0>: 0435
MIPI_FTCAM_CLK_ISOL_P: 0.435
MIPI_FTCAM_CLK_ISOL_N: 0.429

 

[2informaticos]

Both R5335/6 OK?
Diode mode to ground at I2C_FTCAM_SCL/SDA?
Check the same at R5315/6.

Be sure L8502-4 have good continuity.

BTW, any history available?

 

[Sr. Robot]

R5335/6 measuring good.

I2C_FTCAM_SCL: 0.384
I2C_FTCAM_SDA: 0.382

R5315/6 also measuring good.

I2C_ALS_SDA: 0.408
I2C_ALS_SCL: 0.409

L8502-4 have good continuity

No history

 

[2informaticos]

Is the macOS installed normally?
I saw such problem using OpenCore Patcher, when installing new macOS versions, not supported in normal way.
However, this machine should directly support latest macOS I think.

 

[Sr. Robot]

Yes, it is running OEM Sonoma

 

[2informaticos]

Just in case, check it with older macOS versions.
Easy to test booting Catalina from USB, for example.

 

[Sr. Robot]

Same thing on Catalina, installed on insternal SSD just in case.

 

[2informaticos]

Be sure to have good connection for camera lines, from J8500 to other points.

 

[Sr. Robot]

J8500 has good connections on camera lines

 

[Sr. Robot]

Changed U8502 just in case, no change

 

[Sr. Robot]

Also did a DFU restore