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September 17, 2012 8:32 AM Subscribe
Laptop techs of MeFi, I present you a challenge...This laptop refuses to turn on its backlight!
posted by TomMelee to computers & internet (10 answers total)
Greetings. I've got an HP DV4-1125nr laptop that boots up fine, NO BLINK on the panel to indicate any error. The backlight simply doesn't come on.
Initially I assumed backlight failure, replaced screen, no fix. Then I assumed inverter failure, replaced 2x, no fix. Interestingly, I have tested the inverter and it is throwing 19.5v+/- on the supply-in side, so I know it's powering the inverter. (I have actually tried 3 inverters, none power any of the 3 screens I have.)
The only possible remaining thing I can figure is the lid switch, however disconnecting it entirely does nothing, neither does a magnet on/off it while it's sitting there with the backlight off. IDK how to bypass it otherwise, suggestions welcome.
Any thoughts? Display is perfect otherwise, no artifacting or anything.
Cable inspection has shown no crimps, shorts, etc, I've never heard of the actual display connector having anything to do with the backlight.