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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Http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Jan 23, 2008

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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

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