Lenovo V15 G3 No Backlight after liquid damage

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  • techpointhull
    Member
    • Mar 2022
    • 17
    • United Kingdom
    #1

    Lenovo V15 G3 No Backlight after liquid damage

    Good morning guys,

    I have a Lenovo V15 G3 that came in with liquid damage. The damage was very minor and some corrosion on the IO board where the power switch was. After cleaning both the motherboard and IO board in alcohol, the laptop turned on and I had backlight for about 3 seconds but nothing further. I don't have a boardview for this laptop (Have requested this in the Schematic Request section), however from previous experience on Lenovo laptops I have checked pins 1, 2, 3 on the EDP connector. When the battery is connected only, I get 8V and when AC adapter is connected, I get 20V.

    I have also confirmed at pin 6 (DISPOFF), I get 3.3V. The laptop is working perfectly fine except the backlight, I have tried an alternative display and connector but still the same issue. I expected the problem to be a fuse on the backlight rail but because I am getting voltage at both the fuse input and output, and also on the EDP connector I am happy that's not the issue.

    The model of the motherboard is JV472/JV572 NM-E551 Rev 1.0. Any advise is greatly appreciated.

    Kind regards
    James
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      INV_PWM voltage?

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