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

A sansui tv switches on and off by itself. What could the problem?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Desolder out the horizontal output transistor, and now power on the set. If the set now powers ON, replace the horizontal output transistor. It is faulty. [Collector to emitter or collector to base leak]

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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 | Televison & Video

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I have a hisense 50H5G and i cant figure why it wont go to 1080. Its says 480 and i have a hdmi cable and hidef channels. Please help


Try to change from your HIDEF output setting from 480 to 1080 if output from HIDEF not proper then your TV also not work at 1080

Jan 25, 2015 | Hisense Televison & Video

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Sumsung cs 29k40mh its switching on but there is no a display on screen but sound is ok, what am i supose to change?


Check whether the filament of the CRT is glowing. If not, make sure that the horizontal scan output section circuit does not funciton. You should start troubleshooting from it horizontal output oscillator up to horizontal output transistor. For more information

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Ibanez tube king pedal wont work


Check your power supply output voltage. It may be putting out (under) the correct voltage. Also I believe there is a small internal transformer in that pedal that may supply the tube voltage? ... that might be your culprit.

16309851-zfpz2oe0q3qxud0lqrhrckwv-1-0.png

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1 Answer

Powers down and wont turn back on


check fuse, poer suuply lines such as resistors and power regulator... check also horizontal output which is a transistor near the flyback for leakage

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1 Answer

Please Help


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 21, 2008 | Sansui DTV2760 27" TV

1 Answer

Toshiba 32a32 chassis tac 245 powers up for 1 secopnd then red power light flashes.


just fixed one with that problem it was the vertical output ic Q301
that was shorted. try wicking it out. it is a LA7833S.
Postings say to be sure to use the Toshiba part

Aug 17, 2008 | Toshiba 32A32 32" TV

1 Answer

No Picture


you have no horizontal drive to fire up the high voltage section to produce brightness,possible horizontal transistor (output) shorted .they cost around 20.00.take set to shop for repair,also ask for est. of cost to repair.

Mar 01, 2008 | Proscan PS32500 32" TV

1 Answer

Problem with 20" philips magnavox


check capacitor next to flyback 100uf 160 v its right behind it! If this is bad you will have no high voltage only other cause flyback!

Aug 14, 2006 | Philips Magnavox MS3252S 32" TV

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