Question about Hitachi 50UX26B/27K 50" Rear Projection Television

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Hitachi 50ux26B keeps turning off.

I have a Hitachi 50ux26B made in 1996.

The picture was acceptable and the convergence was correct when it will actually stay on.

Inside all of the Green LED's come on for a few seconds to a few min but eventually the TV shuts itself off and the only LED left on is the Red one with the word Protection near it.

There are 5 green led's that I can see. 2 I can not get the numbers of because they are on the other side of the heat sink but the ones on the left of the heat sink are D951, D952 and D950.

I am not sure but I think the board number may be JK03161, however there is a large white sticker with AP63 on the board for the AV inputs and the same type of info on the board AP6X Sigma. I am comfortable using a soldering iron on the TV because if it won't work without my help it may be on a trip to the scrap heap. After selling the parts that would be useful to someone else that is. Waste not, want not.

I have downloaded the service manual however is a there a trouble shooting manual, or does anyone know which items may be at issue in this TV from past experience?


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  • VTXRIDER1800 Jun 29, 2009


    I would say the longest it stayed on today while testing it out was almost 10min perhaps a little less I was not counting the time but had time to complete the auto tuning for convergence and channel line up screens, and that was after being off for at least a few days. After that each time after that less than 60 seconds. I would say that the problem is progressive and that the last few attempts to check out the LED’s it only stayed on a few seconds.

    As for which ones go off first I would say that they are the two I could not read earlier on the far side of the heat sink the D953 and D954 LED’s. The LED’s to the left D950, D951, and D952 slowly fade out after the other two shut off.

    I did not think about it but yes I did have to press the power key multiple times or unplug it and plug it back in as this would turn it back on as well.


  • Steve Yocum May 11, 2010

    How long at it's longest piont does it stay on? When you observe the Green LEDS, do you notice if any go out quicker than the others? When it shuts down, do you have to press the power button twice to power it up again or just once?



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There is a chance that the one of the power relays are causing the problem. They have been known to be intermittent and even work for 5 sec. or 5 days before failing. When the back is off, turn the set on and when it shuts down lightly tap the relay/s in the power supply lightly and see if the set comes on for any length of time. If it does, replace the relay
and you will fix the problem. Let me know what you find.
Hope this helps,

Posted on Jun 30, 2009


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