Question about Hitachi 50V500 50 in. HD-Ready LCD Television

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No video No Audio, power light on

Hitachi 50v500a
LC3X POWER P.W.B. - JK08574-A - LC37E/15

The power light comes on as if there is no problem but thats it, nothing else, no fan, no audio, no bulb, nothing but the power light. The tv sat for about a month and before throwing it away I thought id take it apart and see what I could find. Looked at both fuses and they were both good, I didn't do much but poke around and I put it back together and it worked! Then the next day it did the same thing and I cant get it back on now.

SO...after a lot of research I THINK its the power board:

There are 5 Green LED's and 1 Red LED on this board. When I plug in the TV:
D913 lights up (which is what its supposed to do I assume)

When I push the power button:
D913 remains lit
D911 turns on (this is the red one it has a slight pulse to it but is still bright)
D933 flashes dimly (only for like 2 seconds and u can hear a little chirp sound and then it goes off (sometimes it never lights at all depending on how long i let the tv sit for before trying to turn it on again))
D930 is off (this one used to flash and chirp as well but now it never does)
D932 is off (never comes on)
D928 is off (never comes on)

If the power board is even the problem the cost of a new one on this tv out weighs the price of replacing the tv. I don't just want to throw it away. I'd like to try and have the board repaired or repair it myself if I could get some guidance. Any help on my problem would be greatly appreciated. Thanks.

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  • Aqualunn Feb 18, 2008

    Amazing....I just today ran into the exact same problem with my 50v500a. I haven't phoned for service, as it's not under any warranties, but the more I read the more I get concerned. With other issues I've read about the TV I am not certain I want to invest any significant money into repair!!

    Any solutions would be appreciated...

  • 05roadking Feb 24, 2008

    I have the same problem if the TV sits for an hour or two it will work fine till you turn it off. I also pulled mine apart yesterday and got the same beep noise and the red bulb D911 lit dim and the went out as the noise stoped.Also when the TV is cold if I turn it on I get a picture and sound turn it right off and wait for the blue power light to stop blinking then turn it back on nothing so it can't be its to hot. I let it sit a while and it works fine picture sound and you can here the fan turn it off and have to wait.

  • solusdeus Feb 28, 2008

    Aqua, you pretty much went through the scenerio exactly how I pictured it playing out. I was almost positive it was the power board and I knew the cost of a new one out weighed the remaining value of the television. I'll have to buy a multi-meter and do some research on how to test capacitors, resistors, etc. From doing more research, I found that the most common problem with similiar power boards is a faulty capacitor or cold joint. At this point I'm leaning towards a faulty capicitor on my board so I'll begin there. When / If I find the solution I'll be sure to post it here in hopes it will help someone in the future.

  • Anonymous Nov 26, 2008

    Have a 4-year old 50V500 with the same problem. If I turn off the TV or my kids turn off the TV accidently, cannot turn the TV on again for about 30 - 45 minutes. If I do, a weird chirping sound is emitted and the blue power button lights with no picture or sound. Have to turn off and wait for previously mentioned amount of time to get TV to turn on.


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My repair guy narrowed down the same problem you guys are having to the regulator chip which is mounted on a heat sink
on the power board behind the right front speaker.It can only
be accesed from the back of the tv.

Posted on Dec 02, 2008

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I asked Hitachi support if they could provide some direction, they opened a service file, told me they could not diagnose internal problems and suggested I go to their website to look for an authorized repair center.

I then paid for a TV serviceman to look at the TV and he has told me that it's a powe board problem... $750.00 to fix!!!

Solution: Bought a Sony with a 5 year extended warranty for twice the repair price. That will be the last Hitachi product that sees my household.

Posted on Feb 25, 2008

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