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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  • 4,402 Answers

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

Posted on Feb 08, 2008

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The picture went black but we do have sound. It was running perfect and picture was great until it just went black.


If this is a Toshiba 61A61 rear projection. First you have to determine if it has high voltage. You can find this out by looking at the end of each picture tube where the socket is to see if there is an orange glow indicating that the filaments are lit and the set has high voltage. If they are not lit then I know from experience with this set that there is a bad connection on the deflection board where the high voltage transformer is located. The HV transformer has red wires coming out of it. You will have to turn the deflection board upside down and look for the bad connection. But first just tap lightly on the deflection board with the handle of a screwdriver to confirm the bad connection. If the set comes on you will be required to solder the connection with a soldering iron and rosin core solder. Now if the orange glow is there you have bad capacitors on the hyper module. The hyper module is located to the right looking from the back and stands upright and is soldered to the main board. It will be required to unsolder and inspect the capacitors for bulging at the top. The hyper module is likely to not be available anymore. Changing the capacitors will fix the video problem

Nov 11, 2011 | Toshiba 61A61 61" Rear Projection...

1 Answer

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

Flashing


well you can tap the convergence board and the crt boards see if you can find a loose connection, however be careful there is high voltage

Feb 01, 2008 | JVC AV-48WP30 48" 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...

2 Answers

Toshiba 43HX70 convergence fix - now no video


I think the hardest to solve problems are those I installed!!
Where do we start==no lecture,but I never change a resistor
unless it has changed (in value!) Use a digital meter and check
the value of each resistor.Toshiba is a bit confusing as to values
of each resistor and location in relation to the IC's.Go over your own work first.Check micro fuses in power supply=F851,F852,
etc. Carefully resolder steel jumper wires at board edge,they feed
B+ to convergence amp circuit.Be sure to verify no shorts in pins
of IC's.(use your meter).........T

Oct 25, 2007 | Toshiba 43HX70 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...

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