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Repair guides and support for the laptop line of Acer's Aspire series for casual home and business use.

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LED-Backlight Dark for Acer Aspire 7750-6423 LCD Screen

The LED backlight on the LCD laptop screen is dark. I have researched dark screen enough that I am now sure the screen itself is functioning. I cannot find (and ACER is no help) any connection info (schematic,connector pinout,fuse location, or part layout) on how the motherboard feeds the backlight voltage to the screen.

YouTube and were most helpful but not component detailed enough. All 7750 models similar in many respects.

Asking because I'm cheap -retired, fixed income.

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Any identification on your logic board? Any number will help


Can you check to see if your board is a P7YE0/P7YH0/P7YS0? I do have that schematic and it should be for a 7750


WoW, change your name to SpeedyBird! Mine has P7YEO U98 on a sticker where the memory would fit. Above that # is 3LMFG: 138 I presume its a date code


Contact me by email so I can send you the schematic. It does not have a board layout, so you'll be looking for the reference designators on your logic board. My email address is in my profile, just click my avatar


Researched you a bit and am in awe. Hope I can return the favor someday.


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I'd say it's the inverter... but LED screens don't use an inverter.

Have you double, triple checked the connections to the screen internally?

Hopefully oldturkey has solved your problem... I don't have the schematics myself, so I'm not sure what feeds the backlight on your computer.

It's possible a new screen would solve the problem $71 on eBay, and you can return it if it doesn't work lol. Heres a new screen:

And here's a new LCD cable:

Wish I could be of more help.

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Attention ALL: This was my original question. I ended up putting it in the shop and the tech (from experience) tried everything I did EXCEPT he added one little thing. He pulled the battery maintaining the BIOS !!!

He explained that if an upgrade had been done (it had), the BIOS would revert to a basic version without the cell.

Long story short, IT Worked and the backlight started functioning again.

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