Question about Toshiba 57H81 57" Rear Projection Television

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1080 Mitzubitchi Powers up when toggled on, I get a glow at the bottom of the guns but they wont fire up all the way. Checked the horizontal output and its good. Any ideas.

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  • Sundance McCoy
    Sundance McCoy Jan 23, 2009

    Thank you, im working on it, but Im off to pick up daughter from school. I will let you know what I find.

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CHECK FOR LIQUID SPILL ON THE SIGNAL BOARD. THE LIQUID IS FROM THE CRTS. ALSO IF THIS IS AN OLDER SET THE SET MAY BE GOING INTO IK BIAS PROTECT WHICH IS CAUSED BY A WEAK CRT. TRY TURNING THE SCREEN DRIVES UP A LITTLE AND SEE IF YOU GET RASTER. SCREEN DRIVE CONTROLS LOCATED BEHIND FRONT SPKR GRILL.
IF YOU PRESS MENU DO YOU SEE ANYTHING?

Posted on Jan 23, 2009

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1 Answer

On an older Mitsubishi 1080 hd rear projection tv what does it mean if once its warmed up screen gets wavy and shuts of


Either the power supply or the inverter. If you have never checked the color guns then I would check that first.

Dec 25, 2014 | Projection Televisions

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How can I diagnose the power supply unit in this set? I suspect it is the cause of my problem. Error code 23, screen shrank in and out a couple times and turned off a couple times, now wont come back on....


Hello hellian82,

The problem is the arcing red tube, it can be replaced or rejuvenated by qualified TV technician. The arcing is the result of a spark gap being formed in the picture tube resulting in a short between the HV anode of the tube and ground. Replacement of the tube is preferred, but the tube can be rejuvenated using a CRT rejuvenator.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Jun 23, 2009 | Mitsubishi WS-55809 55" Rear Projection...

2 Answers

Toshiba 57H81, power to transformer and flyback.


IF YOU REPLACED THE SAME PICO FUSE, YOU PROBABLY HAVE A BAD CONVERGENCE IC AGAIN . DID YOY SNUG UP THE IC TO THE HEAT SINK AND USE THERMAL HEAT COMPOUND ON THE NEW IC'S? ALSO CHECK SOLDER CONNECTIONS TO C810 AND C809 THE FUSE BY THE CAPACITORS MAY BE OPEN.

Jan 22, 2009 | Toshiba 57H81 57" Rear Projection...

3 Answers

Do not power on


Can you please inform us the model and brand of this unit..if the unit wont power on this can be a problem with the power supply or the power adapter ...

Aug 26, 2008 | Projection Televisions

1 Answer

Zenith


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 10, 2008 | Zenith R49W36 49" Rear Projection HDTV

2 Answers

Akai PT4298HD No Power, Blinking timmer light


if you know aything about tvs which it appears you do check to see if you are getting voltage to the horizontal output ckt at the collector of the horizontal output transistor if you are probably you either have a horizontal drive or output problem if you are not check to see if you have either fuses or icps or pico fuses are open generally you will see about a 135 volts to yhe hoizontal output ckt.

Dec 15, 2007 | Akai PT4298HD Rear Projection Television

1 Answer

Hitachi 65xwx20b convergence


Your message says you "replaced stk392-150", did you replace both of the stk`s or just one of them??? One is for RGB vertical the other is for RGB horizontal, you should always replace both stk`s as a set, Hitachi recommends you use a "replacement kit"
part number X480306", this kit includes both stk`s with a new & supposedly improved set of stk`s as well as all resistors that are required for proper set-up, they strongly recommend you change all of the parts in their kit. The only other thing besides IC`s & resistors that could cause your problem is:
1) bad dcu output (you need a scope to check this)
2) you`ve lost either the +15 volt line or the -15 volt line to the IC`s, "Fxxx" chemical fuse open in power supply.

Dec 01, 2007 | Projection Televisions

2 Answers

Hitachi 53UDX10B


With the set unplugged check the horizontal output transistor, horizontal driver transistor and the horizontal driver transformer, for shorts, cold solder joints. Next if all checks ok, suspect the convergence IC's and related circuitry.

Jul 04, 2007 | Hitachi 53UDX10B 53" Rear Projection...

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