Question about Hitachi CMP4201U 42 in. HD-Ready Plasma Television

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I have a number of CMP4201U monitors. They all suffer the same problem. They will wake up only for approx. 3 seconds, after mains switch is turned on. Mains switch must be turned off or unplugged for approx. 1 minute or they won't wake up at all. I replaced a power supply in one of these units ... no change. When they do wake up for that short period of time, the screen is lit and correct. This apparently is a common problem, since all of these monitors have eventually failed with the same symptom. Any ideas?

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Posted on Jan 02, 2017

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SOURCE: Hitachi UltraVision 42HDT51 Plasma

Is your tv still under warranty?

Posted on Jul 12, 2008

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SOURCE: Unit will not turn on from standby

I had a similar problem and it was caused by my cable box being in scart 1 as soon as I changed over to scart 2 the problems went away,

Posted on Jul 24, 2008

  • 1 Answer

SOURCE: The tv cycles on and off

dry soldering on EHT out put side horizontal SEXCTION

Posted on Jan 15, 2010

  • 6 Answers

SOURCE: won't turn on

Hi, everyone. Me too have the same problem. TV just stays in red but won't turn to blue. I tried unplugging then wait and restart again, sometimes it will work but lately that trick doesn't work anymore. Then somebody suggested to open the back of the tv (it's not hard... just a lot of screws and a couple of bolts to remove) and clean (vacuum) the exhaust fan. Out of frustration, I did open the back and clean the the fan (has a lot of dust on the blades) and everywhere where there is dust. Just be careful not to touch any part of the printed circuit board with the vacuum nozzle to eliminate the destructive effect of static electricity. Or while you're cleaning it you have to hold the metal frame with your other hand to ground yourself (by the way you have to unplug your tv before you start opening the back). After the cleaning then covering the back, the tv worked... for only a few hours. It did stop working again as soon as I turned it off then on again. Again I opened the back, this time I removed the power supply board ( that's the biggest board and located above where you connect all your wirings). Got myselt a small brush and start brushing and vacuuming the dust out. I don't know if the cleaning did the trick or it was the unplugging of the connectors from the power supply board. All these work did the job... my tv is still working for almost three weeks now. Another thing, when you have a a time warner cable with a dvr box where you can program its remote to power most of your equipment in sequence by pressing the remote power button, I set it so that the tv will be powered up last considering that power can fluctuate everytime a unit starts up specially when they are all connected to the same power/surge protector... tv doesn't like it when the power fluctuates while it is still starting. Hope these helps.... (Hitachi 42HDS69)

Posted on Aug 07, 2010

gregjr_pl1
  • 138 Answers

SOURCE: Model: Hitachi P50a402 plasma TV blinking

Did your already check your H- out section. This happen when your TV at protection mode. Its mean it detect defective parts inside the unit. Isolate the H- out power and open the TV Then check voltage if there's power reading meaning that the H- out section have problem.

Posted on Aug 12, 2011

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LCD Screen problem


You have a failed inverter circuit. This is a very common fault with BenQ and other LCD monitors. I have seen more FP737 and FP731's and all their cousins in the last 2 years then I care to count.

You will be best to take it to a TV technician and have them do the repair. There are ways to fix it yourself, but the chances of success are not great without a decent amount of electronic knowledge.

Call several places and get approx quotes based on the inverter fault. A lot of TV techs will not work on LCD monitors and is another good reason to call around first.

One final thing, check the manufacture date on the back of the monitor, these normally come with a 3 year warranty and it will be either expired now, or very close to it. If it is still under warranty, then contact BenQ near you to facilitate the repairs.

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