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Jon Hrehorak Posted on Jun 14, 2007
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Hitachi 50EX20B Bigscreen TV

10yrs of Flawless use until about 2-3 months ago...Problem started with TV set shutting itself off for 3 to 10 seconds,then coming back on (without any imput from us!!)...this occured Rarely (week/10 days) at first and gradually more frequently (and stayed "OFF" longer) until TV would no longer power up again (on its own),,without us repeatedly pushing on/off button....Unplugging and allowing TV to cool off(few hrs or overnight) seemed to help BEFORE, but now TV will not turn on at all!! Cleaned much dust "gently" (while Unplugged),fuse OK,....Red LED (power supply??)on main circuit board flashes momentarily (2-3secs)---then stays ON....BUT , 5 "other" green LED's @ various places on main circuit board Do Not Light Up (with power on)....Also,Red LED light (on the Channel/Volume selector) does not light up and shuts down when the TV shuts down...A320 Aircraft tech ,hoping I can troubleshoot/fix this...Best place to get a PDF service manual AND Expert advice Greatly Appreciated...Thanks

  • 1 more comment 
  • Anonymous May 22, 2008

    I HAVE A HITACHI 52 INCH BIG SCREEN THAT TURNS ITSELF OFF THEN IT TAKES ALIITTLE WHILE BEFORE YOU CAN TURN BACK ON ANY IDEAS? THANKS RICK/

  • Anonymous Mar 21, 2014

    I found 2 lizards in below the power supply board. Removing the lizard and clean the board but still the led is blinking up and down. So what can be the fault.
    Regards

    AShvin

  • Anonymous Mar 26, 2014

    The cable shuts off by the remote but the t.v. does not. Tge red power light stays on unless we unplug it

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  • Posted on Apr 21, 2008
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Excuse me, I'm no tech of any kind. Was that the solution to fixin the T-V? I'm having the same type of problem.Your answer is make sure the coolant is not leaking? How do I go about my problem

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  • Posted on Jun 14, 2007
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You can download a PDF from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=50EX20B Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck

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