Question about Hitachi 42HDS69 42 in. Plasma Television

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My hitachi tv is dead

I took it apart and checked everything on it and in it, I also cleaned it everything seen to be OK, its got power but no lights anywhere.

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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

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My hitachi LE42H508 still wont turn on after replacing power board. Power cord has power coming in but still nothing. No noise lights. Help

Your main board is probably dead and is not allowing the power supply to power up from standby mode. I have seen a few of these TV's fail recently and was able to fix them by replacing the eeprom on the main board.

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I assume the projectors are of similar age and have similar useage history? Not certain why they would fail together, but the most probable cause is faulty switch mode power supplies. The electrolytic capacitors in these supplies a relatively short working life, especially when installed in high temperature environments - like a video projector. new caps in the supplies may be all that's required to solve the issue. If you have other similar projectors, they may well be approaching the same problem.

Any reasonably competent TV repair tech should be able to check the supplies for you, and repair them if found faulty :o)

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The lamp of course would be logical to suspect---the only suggestion I have as have seen this before is some of these sets if enough dust inside will do this---seen ones that would play twenty minutes and either shut off or off and on.

Seen dead ones also where dust on the fans slows them just a little-set monitors things like that===usually we take back off and set outside with a air compressor and clean all air channels out (air gets taken in from front area and exits rear).

It at worst will rule this possible solution out and at best may resolve the issue. Seen say fifty or more sets where after cleaning with air (no matter how clean the house is it may look like a dust storm when you air it out) the issue was gone.

One even had golf ball sized white spots in picture--dust inside the two month old set's light engine.

Good luck and I hope it helps as it cannot hurt.

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If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address. 
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Primary Symptom: No Audio or Video. Power light will come on briefly then shut off.
Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.

Hope this helps,

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