Keyboard backlight is ALS dependant.
Test another screen, with known good camera/ALS assembly.
Test another screen, with known good camera/ALS assembly.
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820-00928 2017 A1707 with no camera/ALS
- Thread starter sekidata
- Start date
It should work for test at least.
What about KB backlight and ALS?
Screen backlight reacts directing flashlight to the ALS?
Screen backlight reacts directing flashlight to the ALS?
Camera and ALS not working at same time, should point to power failure; as both use the same power rail.
Did you change the small video cable?
Check if 5V appears on the corresponding point of T-CON board.
May also have problems with U3900.
Check its power and reset.
L4002/3 have good continuity?
Did you change the small video cable?
Check if 5V appears on the corresponding point of T-CON board.
May also have problems with U3900.
Check its power and reset.
L4002/3 have good continuity?
ipetro
Member
Just a note, most often the problem is either in the camera cable or the camera module: it’s easy to check, you just need to take a broken A1707 display (possibly even from 1708) and connect the camera cable to the display board and the camera with the sensor on the broken display is 99.9% always working. but 100% of 1990 the camera and light sensor do not work, only the picture if 2018 and 2019 will not work at all. This is my experience and should not be taken as a call or recommendation. )