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820-3332 Backlight problem

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  • 820-3332 Backlight problem

    Hi,
    i have a problem with this board, liquid spill on the board, all the board clean.
    Before the PPBUS_S0_LCDBKLT1 in short to GND, after i have 12,58V, the Fuse F9700 is burn, i change it, now it's good but no backlight again.
    PPBUS_S0_LCDBKLT_FUSED=12,58V
    PPBUS_SW_LCDBKLT_PWR=0V
    LCDBKLT_EN_DIV=12,22V
    I see the picture when i put a lamp on the screen.
    Can you help me? what can i measure?
    thanks



  • #2
    LCD_BKLT_EN present on Q9707? I doubt it. Checked SMC_LID?

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    • #3
      Lcd_bklt_en = 11,94v
      lcdbklt_disable = 11,94v
      smc_lid =3,45v

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      • #4
        wow 11.94 on Lcd_bklt_en?? Are you sure you have measured on the correct pin?? Measure pin 5 and 2 from Q9707...

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        • #5
          I can't give you any advice if you cannot provide correct measurements. Does it not occur to you that if there is 12V on BKLT_EN (3V logic) something must not be right.....?

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          • #6
            I make a mistake sorry , i measure Q9706, on Q9707:
            2=3,34V
            3=12V LCDBKLT_EN_L, ?? not normal?
            4=0V
            5=0V

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            • #7
              Ok i solve the problem, with a good clean of the board with ultrasound cleaner. the BKL_EN_L fall at 0V.
              PPVOUT_S0_LCDBKLT=55V
              the display is burn on the board inside the screen. need to change the screen too.

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