Hitachi 55HDX99 Plasma Display won't turn on

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  • canadaboy25
    What is normal?
    • May 2013
    • 509
    • Canada
    #1

    Hitachi 55HDX99 Plasma Display won't turn on

    Hey guys, recently I repaired a Hitachi 55HDX99 Plasma TV with help from you guys on this thread. https://www.badcaps.net/forum/showthread.php?t=75627
    The problem ended up being a shorted buffer IC on the upper buffer board.

    After the repair, the TV was working fine and we used it on and off for about 20hrs. However, the last time we were using it, the TV just turned off in the middle of watching a show. There was no power at all and the power button did nothing.

    Unplugging the TV and plugging it back in makes all the relays click and the power light starts flashing blue. After a couple flashes, a relay on the power board clicks and all power is cut. I tried disconnecting the upper and lower buffer boards one at a time to see if another chip had failed but this made no difference. The symptom is also different from the bad buffer chip.

    If anyone has any ideas on what to look at first I would appreciate it.
    canadaboy25

    -Sometimes the light at the end of a tunnel is an on-coming train
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