Fault · Display and touch
No auto-brightness or True Tone
Brightness doesn't adjust automatically or True Tone is gone.
View the guide steps online with your BoarDray account.
Covered on 146 models
- Samsung64With guide
- iPhone42With guide
- iPad40With guide
How to approach it
The ambient light sensor (ALS) sits on the top flex and talks to the CPU over I2C. True Tone also needs the original screen's data: after a screen replacement without transferring it, True Tone disappears even if the circuit is fine.
Other faults in Display and touch
- No displayView fault
- Touch not respondingView fault
- Screen very dark or no backlightView fault
Where to find it
- By modelEach model lists the guides that apply to it.
- By familySamsung, iPhone, and iPad already have the guide.
Models where it is covered
Samsung · 64 models
iPhone · 42 models
iPad · 40 models
See inside every board
Sign in to open the No auto-brightness or True Tone guide next to the schematic and board view.