[Question] What voltage should be applied to a laptop LCD back-light?

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domih
Posts: 380
Joined: Mon Feb 11, 2019 4:48 pm
languages_spoken: English, French
ODROIDs: UX4, HC2, N2, H2, C4, H2+, HC4 - 1GbE, 2.5GbE, 10GbE, 40+GbE
Location: San Francisco Bay Area
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[Question] What voltage should be applied to a laptop LCD back-light?

Post by domih »

Hello,

I'm recycling the LCD of a dead laptop for use with a C4 or HC4. See pictures at the bottom.

I ordered the LCD controller board from eBay, see picture at the bottom.

The controller board looks like it is only handling the screen and does not care about the back-light.

Two hours of searching on the net were not successful :( (too many different answers). Watching youtube videos about LCD back-light as of this writing.

Does any good Samaritan know which voltage I should apply to this LCD back-light?

TIA!
back-of-lcd-panel.png
back-of-lcd-panel.png (1.41 MiB) Viewed 120 times
lcd-model-number.png
lcd-model-number.png (1.32 MiB) Viewed 120 times
ebay.png
ebay.png (496.97 KiB) Viewed 120 times

domih
Posts: 380
Joined: Mon Feb 11, 2019 4:48 pm
languages_spoken: English, French
ODROIDs: UX4, HC2, N2, H2, C4, H2+, HC4 - 1GbE, 2.5GbE, 10GbE, 40+GbE
Location: San Francisco Bay Area
Has thanked: 137 times
Been thanked: 143 times
Contact:

Re: [Question] What voltage should be applied to a laptop LCD back-light?

Post by domih »

Probably never mind: the back-light cable just plugs into the inverter.

I saw it twice in YouTube videos, then I check the PCB pieces from the laptop and the one with the plug to receive the back-light cable is indeed the laptop inverter :-)

Incredible the stuff you can learn in YouTube.

The eBay picture in the OP shows that same plug at the top of the inverter.

Topic quasi-closed. I'll put SOLVED in the title once I receive the controller board.
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odroid (Mon Mar 29, 2021 10:37 am)

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