Question about Toshiba 43HX70 43" Rear Projection Television

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Toshiba 43hx70 it power`s up the crt`s are lit but no hight voltage, but when i tap the chasses the high voltage comes on and pic is jumpey like a vert proublem i resolder the board around the vert and HVT and power supply and still same probelm could this be a problem with the flyback? need help

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  • Rob McCutcheon
    Rob McCutcheon Feb 08, 2008

    THANKS NOW I HEAR A HIGH PITCH SOUND COMEING FORM FLYBACKS AND I STILL HAVE THE FLICKER BUT I LL FIND WHATS WRONG SOME HOW, THANKS FOR YOUR HELP

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  • Master
  • 4,402 Answers

I dought it, check aroiund the convergence ic's "stk392-xxx"

Posted on Feb 08, 2008

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1 Answer

Supplied output voltage has hight frequency


Line-load-regulation to the TV power supply board is very low. Replace the main power supply board.

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Toshiba cz 36t31 suddenly has no sound and shows no pic only the red on light comes on..how do i fix this and is it worth fixin???


If the red light on little chance of a fuse, set is large and old enough unless you have some experience or know someone who does you may not be able to fix it.

Issues range from broken connections at for example the high voltage transformer to elsewhere in set or almost any part in power supply for this issue.

Typical high voltage transformer--look do not touch.
12_11_2012_8_36_10_pm.jpg

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DEAD JUST STANBY LIGHT FLASHING AND HIGH VOLTAGE COMING AND COMING OUT A 1 SEC AFTER.


If the high voltage comes up and goes right down something in that area is either shorted , open or bad---only thing in power supply that could cause this is if the main voltage (130 volts plus to the high voltage area is HIGH---the high voltage will go excessive and shut the set down--xray protection.

Oct 25, 2012 | Toshiba 27A60 27" TV

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NO HIGHT VOLTAGE


sounds like the LSB is defective as that controls all the high voltage and deflection circuits. If you go to the following link and leave them a email with your model number they should have a LSB board for your model.
http://servicemanuals.vstore.ca/

Nov 21, 2008 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

Help


resolder the vertical IC that is whats making the CRTs go blank. Its a safety issue where the CRTs blank when there is no vertical deflection. Just resolder the output IC that should cure your problem

Mar 12, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

Help


You have got to have a cold or cracked solder joint. Get a strong light and go over the chassis with a magnifying glass. Solder everything that doesnt look shiny but be looking for hairline cracks in the solder especially near the vertical output IC and associated components.

Mar 12, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

No video on a 50H82 Toshiba Projection


If the screen is lit, then there is high voltage. If there is no video, and the screen is lit, then there is a loss of video. The fault can be anywhere along the main video path before it gets decoded in to the red, blue, and green compositions.

If the screen is not lit, most likely there is a high voltage failure, or there is a failure in the bias supply for the tubes.

When there is a loss of high voltage, this can be from any of the components in the high voltage area. Some of the main things that go defective are the flyback, high voltage multiplier, and various other small components.

Have you considered to replace the set with a good Plama or LCD set? This repair may end up being on the expensive side.


Jerry G.

Mar 10, 2008 | Toshiba 50H82 50" Rear Projection...

1 Answer

Powers up no pic


You have a bad solder connection in the Vertical deflection circuit. Try re-soldering the vertical output IC and the Vertical yoke pins. You may have to look over the Vertical circuits with a magnifying glass to actually find the bad solder . A hint if the solder looks dull re-solder it.

Jan 23, 2008 | Toshiba 43H70 43" Rear Projection...

1 Answer

Changed chips and now no picture


When I changed the STK392 chips I had no pic on startup also. I don't know why but I found 2 6.3 amp pico fuses blown on the front edge of the power supply board. They are marked on the bottom of the board. I had to fudge some pigtailed AGC size fuses & the high voltage & video started..jim

Aug 29, 2007 | Toshiba 43HX70 43" Rear Projection...

1 Answer

Volume buttons stuck inside


hi , first i want to say that the tv is not a game it is hazard set very high voltage inside so if you don't have any experience please dn't try to , but you can do it your self just took outlet off and took case off and try to draw the chasses towards you to behind then look inside to the place of the buttons you will see aplastic tips which will push the volume switches that are soldered on the chasses and with your fingures try to push out the plastic tips to relocate it to the original state it is too easy and the please try to be away from the cable that is fixed to the screen cause high voltage is it, refix chasses and cover and give me high rate insted of £40:) regards

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