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HITACHI L42VK04U Won't turn on, interface still responds

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    #1

    HITACHI L42VK04U Won't turn on, interface still responds

    Hi guys,

    I've got a hold of an HITACHI L42VK04U, the machine will not turn on at all. However the touch sensitive buttons do emit a tone each time you touch them, like they should. The machine has a Vestel 17MB65-2 mainboard and a 17PW26-5.

    After testing the power supply I've found that the standby votages seem to be okay, ie the 5V and 3.3V. I also checked D881 (I believe that is the correct number, it's next to C850 and C991) and that is working fine. There's no tell tale signs of bulged capacitors either.

    Could any advise me on where to go from here please?

    TIA for any help
    http://www.technciallysmart.co.uk - Some helpful info under Fix It Yourself
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    #2
    Re: HITACHI L42VK04U Won't turn on, interface still responds

    Just an update but I tried pulling the ST_BY both high and low and I couldn't get the 30V and 24V lines to do anything so my guess is that the power board is the issue. Anyone care to confirm this before I order a new PCB? Cheers again
    http://www.technciallysmart.co.uk - Some helpful info under Fix It Yourself

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      #3
      Re: HITACHI L42VK04U Won't turn on, interface still responds

      well, it wasn't the power board. unsure why I can't get the correct voltages to appear but a replacement board does the same thing as the old one
      http://www.technciallysmart.co.uk - Some helpful info under Fix It Yourself

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