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820-3476-a turn on no display

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  • 820-3476-a turn on no display

    Unit had water damaged close to R5498 and C5549.
    R5494 : 17.75v. Fan spinning normal, CPU is not getting worm.
    Missing EDP_PANEL_PWR_OR_PSR_EN on pin 1 R8319
    Have PP3V3_S0 on pin 8 of U8330 .
    PP5VS4 is present.
    PPVCC_S0_CPU: 1.69V
    Known good display connected.
    Dont know what to next, any help please.

  • #2
    Pins 28-30 of J8300 must get 5V, at least in the first few seconds.
    This voltage is not maintained if pins 1 & 4 of U8330 don't go high.
    Checl these pins and be sure L8300 is OK.

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    • #3
      Pins 28-30 of J8300=0v

      1 & 4 of U8330: 0v
      L8300 is OK.

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      • #4
        Did you measure in the first few seconds, when board starts?
        Disconnect J8300 and test again.

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        • #5
          Pins 28-30 of J8300= 0v (in the first few seconds, when board starts ,Disconnect J8300)

          1 & 4 of U8330= 0v ,(in the first few seconds, when board starts ,Disconnect J8300)
          Checked twice.

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          • #6
            Check for USB activity; your board seems to be stuck.

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            • #7
              NO Activity USB. board seems to be stuck it means no way to fix it?

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              • #8
                Test new BIOS, clean ME...

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                • #9
                  what do you mean new Bios, Clean me? Can i swap a good known bios from another MB?

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                  • #10
                    https://www.ghostlyhaks.com/blog/app...lean-me-region
                    is it good to follow?

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                    • #11
                      You can try a known good chip from identical board.
                      Just for test, but it will have dirty ME region...

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                      • #12
                        After changing Bios , CPU getting hot and found USB activity on I/o card side but no USB activity on other side no display as well.

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                        • #13
                          After smc reset i see the Diplay and chime too. Could you please tell me how to do clean ME bios. Thanks for your assistance.

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                          • #14
                            Upload your backup somewhere...
                            Think to buy Medusa 2 for the future. This can do all the job onboard.

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                            • #15
                              Hi, from where i should buy Medusa 2? I am using CH341A but this one sometimes cant recognize some bios chip. any suggestion please.??

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