Question about Toshiba 43H71 43" Rear Projection Television

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Aging 43H7143 This tv is almost 7 years old and is experiencing multiple problems. 1. touch focus not working (when used it prompts touch focus error) 2. screen is also showing constant red and green vertical lines when watching dvds or cable tv. 3. tv screen also showing double projection of characters and objects with constant white fuzzy horizontal lines. 4. tv also goes out to a black screen when power is still on (will come back on if tv is cut off then on.) Gteatly apprieciate solutions or possible parts replacement.

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  • Terry Tates Mar 23, 2008

    I am having a similar problem.

    I am seeing triple vision Red Green and Blue

    Also touch focus states error.

  • Anonymous May 22, 2008

    touch focus not working - manual focus not working on red lines - manual focus doesn't finish



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Posted on Jan 23, 2008


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Rylee just advised me that I had a convergence problem with my Panasonic PT-47WXC43 which could cost 300-350 to repair. The TV is approximately 7 years old and I'm aware there are a lot of bulbs and other...

I replied your previous question, click HERE to read it again.
If tv shows bright picture in proper focus then it would last few more years as it is rear projection tv that has 3 picture tubes (red-green-blue) to project color picture on front screen.
Its your choice to have new tv instead of repairing this one and yes, its correct that 32 inch tv is available under 700-800 dollars.
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Picture out of focus. type or subtitles are fuzzy Have tried all picture adjustments in "menu"

As the CRT (picture tube) weakens the electron beam will loose some of its intensity. This will cause the beam to become a little wider, and thus the scanned picture will look softer or out of focus. Most of the time, the corners, top, and bottom tend to start getting worse than the center.

Sometimes the focus bias can be cheated a little. Some models of TV sets have a focus pot on the CRT circuit board, or on the high voltage multiplier. This control works in a high voltage area. I suggest you get experienced assistance for this. If you take the TV set over to a local TV shop or find an experienced tech, he could try to adjust the focus for you.

Considering the age and type of set you have, you would be better off getting a new up to date TV set.

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27'' RCA appears out of focus on the vertical Edges of the Screen

I've seen this on many computer CRTs as they age past 6 years. I would imagine that the gun alignment is out. Are all the colors (RGB) fuzzy, or is it hard to tell?

1. Sometimes, extreme settings of contrast or color (usually to offset low output from aging CRT) can appear to unfocus your screen. Adjust color/contrast down if they are maxed out or close to highest setting/pot level.

2. A very likely culprit is unshielded speakers are too close to the screen. If this is the cause, the speakers' magnets distort the part of the screen closest to them (sides), and it will get better/worse as you move the speakers away/closer to the TV. If there are not magnets near the TV, and degauss function does not fix problem ('89 TVs have degauss?), see #3.

3. The focus can be set by adjusting the flyback transformer. As an experienced electrician, you should know about the dangers of messing with the insides of the unit.

If this fails, you might have other bigger issues. I'd suggest a nice trip to lead reclaimer if so. I'd say 19 years is quite a life for a CRT.

Nov 12, 2008 | RCA F27440 27" TV

1 Answer

Touch focus error will not correct

If the touch focus isnt working and the picture has a 3D look you will need to change the conversion ICs. This is a straight forward repair just unsolder the old and solder in the new. You will need to replace both. They are located on a large aluminum heatsink and they will have STK numbers stamped on them they are quite large easy to find. The numbers will be something like STK392-110 or simallar. Let me know if you need anymore info.

Mar 23, 2008 | Toshiba 53H71 53 in. Rear Projection...

1 Answer

Fuzzy or blurry picture

Ok with you I can skip the "do you have electronics experience?" questions. With 14 years under your belt you are a pro. So here we go. The problem you are experiencing is called blooming/loss of focus this occurs when there is an increase in CRT anode voltage and control of the electron guns (in the CRT) is lost. The result is the picture spreads and focus is affected. The problem can some times be taken care of by adjusting the focus control However if you have auto focus the auto focus circuitry might be the problem. The common parts (areas) to check are as follows: 1) Focus control (to see if the problem can be soled by adjustment) 2) IHVT anode (test to see if voltage is correct you will need a schematic and a high voltage probe) 3) CRT Socket board ( Check to see if the bias voltages and input signals are correct you will need a schematic, multimeter and oscilloscope) These would be the areas to check, I hope that you are seeing my point here. My next bit advise if not one of your experience, you have that, 14 years of it. However, you have little ones and they are your NUMBER ONE concern, So my advice would be to get the set repaired at a TV repair shop. The reason being is because even though I have named some places to start your troubleshooting, TV repair is not an easy thing and there may be other components that could have gone bad and you don't have the time to do investigative troubleshooting. I wish you well on this issue and take care of those little ones. Respectfully Submitted, Shuttle83

Dec 13, 2006 | Sharp 32C241 TV

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