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Will not turn on unless it is unplugged numerous times. Changed power supply board and still does the same thing

I replaced the power supply board. After two days it will not turn on? I am trying to determin if the plugs in the lower right corner are plugged correctly? they both have four wires. One set has a yellow wire, one has a red wire. I have the yellow wire plug in the lower connector. IF they are correct do you have any suggestions? The Power board cost $130.00. What else would cause this problem?

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  • Harold Montgomery Feb 12, 2014

    My TV is a Hitachi model42HDT50M The power supply is a MPF7404 Part #HA01134.. I was told told the power supply board would cause the TV not to power up unless you unplug and plud back in numerous times. Changing the power supply board did not help

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  • Televison & ... Master
  • 3,204 Answers

As there is no model number given it could be a software problem, if you turn on the tv and the light changes and stays change but the tv wont turn on it can be the software for the tv is not booting up, tv's with log boot usually do this but a software fix usually sorts it out. check the manufactures web site to see if there has been any updates or reflash using the old file from there firmware page.

Posted on Aug 10, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: wire diagram for splitter

On the 205064 hv splitter with the splitter mounted in the set,left to right, hv transformer,red tube,green tube,blue tube,plug on right side goes to screen asy,the black wires plug on the left side of splitter,which are grounds.

Posted on Mar 04, 2008

  • 1 Answer

SOURCE: Power problem

OMG!! I had the exact same problem! I unplugged the TV to paint and it stopped working with a flashing green button. I ran my fingers along the bottom of the screen and it actually worked.. wow THANKS A TON!!!

Posted on Jul 06, 2008

WeListen2You
  • 538 Answers

SOURCE: power supply has a short

sounds a lot like the auxiliary power for the other parts of the board..replace power supply

Posted on Oct 09, 2008

  • 2 Answers

SOURCE: Replace Light Engine

I have the 62HM95 and my light engine went out between 2 and 3 years. I will never buy a Toshiba again. I have had nothing but trouble with the components and the customer support. I am in a class action lawsuit with them, but I doubt very much will come of it.

As far as fixing your TV I was in the same delimma as you. I wasn't willing to pay nearly $1000 to get this set repaired when it already cost $3000 and it started having problems within the year and major issues after 2-3 years. I was willing to risk a couple hundred bucks that I could fix it myself. If you aren't very handy with taking things apart and putting them back together, by all means don't do this. It is pretty easy to do and you can figure it out as you go, but I wouldn't suggest you doing this if you weren't willing to take the risk of really messing it up.

I didn't go to Part Store.com because they wanted $456 and then when I finally decided to do it they raised the price to $556...No way, I found http://www.tristatemodule.com/html/light_engines.html and you can get a light engine that is refurbished for $250, or you can have your light engine refurbished for $200, which is what I plan to do if this one fails in the next two years. I looked at their site and it doesn't show that they have any in stock, but they may if you call. I wasn't comfortable sending mine off to be refurbished because I wasn't sure if I would remember how to put it back together, and I'm glad I didn't because the one they sent me didn't work, which sucks, but it happens. I called them back and sent it back to them and it worked fine. All in all, I had no instructions or any other help besides my memory of how I disassembled it and it only took me an hour at the most, not really too hard.

The only other issue I had with them and it really wasn't with them as much as Toshiba is, I received a light engine for a 46" model, which when I talked to Toshiba they swore up and down that it wouldn't work, when I talked to TriState about it they said that Toshiba would say that and they had used it in 1,000's of 62" models and it's worked fine. After they replaced the broken one they sent originally, the new one worked fine and is still working brilliantly and I have my original 62" light engine to get refurbished if anything should happen again. Their shipping time was good and when I returned the product to them, I received a working part pretty quickly.

For $250, this would be the only way I would go. If this hadn't worked, I probably would have just went out and got a different TV. I hope this helps.

Michael

Posted on Nov 17, 2008

  • 2 Answers

SOURCE: Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852

Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

  • Upon turning on set I got flashing red power light and nothing else.
  • Removing plug for one minute and plugging in results in:
    • Audible click, steady red power light for 2 seconds then slow flashing red light
    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
    • Audible click, steady red for about 2 seconds then slow flashing red light
  • Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
  • Fuses F850 and F852 found blown

Repairs Made:
  • PD0074 DEF/CON Power Board
    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
    • Replaced blown fuses F850 and F852.
      • I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
      • Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
  • Some solder. Already owned de-soldering tools, etc.
  • Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Posted on Jan 05, 2009

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Hello,

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