Question about Toshiba 42H83 42" Rear Projection HDTV-Ready Television

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Double picture and double color. Can it be fixed or not?

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Mike Longo

  • 398 Answers

SOURCE: double imaging

The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.

Posted on Sep 11, 2007


William Rayburn

  • 934 Answers

SOURCE: The pictures colors do not line up

The convergence amp(s) need to be replaced. Your unit takes two STK392-110 Sanyo built amps. In addition all the low ohm resistors should be tested for change in value and replaced as needed... Not an expensive repair for a qualified shop. We do four or five a week...

Posted on Nov 30, 2007



  • 1 Answer

SOURCE: Toshiba TP50G50 Theaterview picture is double with red color only

Your alignment is off. Go to the set up menu then convergence. hit right and you will be in the convergence menu. select the color that is not in alignment. The green line does not move. if blue and green are lined up the line will be cyan. if red and green are lined up the line will be yellow. when all three are lined up the color will be light. Best of luck!

Posted on Dec 09, 2008


  • 647 Answers

SOURCE: 57HX81 projection tv,color is mostly red and picture is double.

This is a convergence output IC problem. convergence board would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$300

Posted on Sep 28, 2009


Sonny Berry

  • 8617 Answers

SOURCE: Color appears out of alignment. The set has

Replace the STK392-110 Convergence ICs and the 6 1.8 ohm 1watt resistors. You can get the repair kit whcih also contains the instructions from

Posted on Nov 24, 2009

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Toshiba 42H83 Hyperboard 20 minute Wavy Line Repair Snafu I have repaired several tvs, this one has been more of a challenge due to lack of only service manual without a schematic. I replaced the caps on the MVPU14 Hyper board. Those that I found bad with ESR meter. I am fairly certain I botched this the first time using surface mount capacitors and possibly shorted something out when I re-installed. The tv came up with a blinkng red power light problem where the tv would not turn on. I removed and re-worked the Hyperboard using thru-hole parts instead, much easier. I still have the blinking red power light with 1 second intervals problem. In trying to isolate the problem I was able to do the following: A) Removed various boards and powered unit up to watch for changes in operation. B) I found out with the DPC Unit (PD0077) removed and all other boards installed, I am able to have the tv respond to the remote and front panel buttons, have sound, but no picture. I was able to hear a DVD player playing in the background that I had connected. C) No Menu can be seen on the screen, the bulbs don't light at all. D) I still haven't ruled out a faulty Hyper board yet as I don't know if its operation is dependent on having the DPC unit (PD0077) installed. I have not found any signs of damaged components, so now wondering what is the next target place to look at. Notes: 1) TV was working fine with nice bright picture before I started repairing the Hyperboard, so I haven't considered convergence issues and such. 2) I have been focusing more on the theory that the first repair of Hyper board had a capacitor shorted possibly up near top of board by LX229. 3) I did check all the pico fuses I could find and none of them appear open. Since I don't have a schematic, if you suggest checking a voltage, please advise part number and pin to check. I was thinking the 5Volt line should be checked, but not sure where. I do notice a 9V signal temporarily upon power up but goes away when power light begins blinking. Thoughts?

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