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820-3787 No Lcd Backlight Powers On And works

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  • 820-3787 No Lcd Backlight Powers On And works

    Hello guys i'm working on a 820-3787 issue it has no backlight. Here is what i found i have 12 v on pins 3 and 4 of Q7706, the problem to me is i have no LCD_BKLT_EN on u7701 therefor the chip won't send pin 3 to a lower voltage to open the drain i traced LCD_BKLT_EN to U8400 then i found that pin 63 EPD_IG_BKL_ON has no power checked at resistor R1281 Pin 1 i'm completely freakinhg confused. What should i check from here?

  • #2
    So, you have image on the screen but no backlight? Have you tried another LCD assembly??

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    • #3
      Yes I see image but have not tried another lcd I have one but it's cracked I could try it

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