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820-2530 board no back light

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  • 820-2530 board no back light

    820-2530 board , no back light... now i change the led driver ... getting around 19v in back light rail. when i did connect the power from logicboard screen blink . with light .... im thinking which rail control the back light brightness might be down any , idea thanks

  • #2
    Voltage on pin 2 and 7 of U9701?

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    • #3
      Originally posted by dukefawks View Post
      Voltage on pin 2 and 7 of U9701?
      pic 2 =3.2v, pin 7=0.14v

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      • #4
        Oops I meant 2 and 4, but I guess 4 will be present. VIN voltage on pin 23?

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        • #5
          Originally posted by dukefawks View Post
          Oops I meant 2 and 4, but I guess 4 will be present. VIN voltage on pin 23?
          pin2=3.2v, 4=3.1v, 23=12.6

          pin 21=20 v

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          • #6
            Here the setup , of I disconnect the power there is blink of back light for .001 sec
            Attached Files

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            • #7
              Strange, it is boosting but 20V is not enough. Was the problem the same before changing the chip with the 20V on the output?

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