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820-2530-A boot problem

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  • 820-2530-A boot problem

    Hi!

    On that 820-2530-A board i have this problem: i have to shut off and turn on 2/3 times to start the booting process, otherwise the display stays black and the white led turns on.
    When machine starts everything is ok and works fast and stable for days.

    What you suggest to start checking?

    Thanks

  • #2
    Resistance to ground on PP3v42? If less that 20Kohms, trash

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    • #3
      Thanks, tomorrow i will check!
      In case, why you say trash?

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      • #4
        If less that 20Kohm, very likely the MCP is pulling it down and starting to fail. Being this is a 10 year old machine, that would not surprise me.

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        • #5
          In fact lower than 30k (ohm scale), is a bad sign for MCP...

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          • #6
            I read .35 M ohm between ground and R6995

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            • #7
              (in case you say that is better to change the MCP i have other boards, in can simply swap it?)

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              • #8
                You can never be sure about an MCP so old.
                Swap it and pray.

                Change C7771 first, just in case...

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                • #9
                  Changed C7771 and fixed.
                  Big thanks to everybody!

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