Fault · Display and touch
Screen very dark or no backlight
With a flashlight you can see the image, but the screen is black or barely visible.
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Covered on 53 models
- iPad38With guide
- Samsung15With guide
How to approach it
iPads with an LCD screen have their own backlight: a boost converter (inductor, diode and chip) raises the voltage of the main line to what the LED strings need, and the driver shares the current between several strings. If you can see the image with a flashlight, the screen is getting data and only the light fails. The most common faults are an open input filter (often after connecting the battery with the board open), the boost diode and the LED strings of the screen itself.
Other faults in Display and touch
- No displayView fault
- Touch not respondingView fault
- No auto-brightness or True ToneView fault
Where to find it
- By modelEach model lists the guides that apply to it.
- By familyiPad and Samsung already have the guide.
Models where it is covered
iPad · 38 models
Samsung · 15 models
See inside every board
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