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Aporte original por: Minho ,

Texto:

''This is a belated answer so hopefully it can be of use to folks who search for and find this question.''

If the screens are dim and won't get any brighter even though the brightness scale is moved up, then that is usually caused by a damaged or loose coil in the backlight circuit (L1503). Now in your situation, it could be caused by the impacts the individual devices sustained over time or it could be caused by low quality screens drawing too much current and causing excessive heating of the coil, potentially damaging the coil.

Situations like these rarely happen in a vacuum though so it could be a below spec coil matched with below spec screen. Still, the odds of you getting two like that in a short time span seems remote unless the screens were really poor quality.

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