Question about Toshiba 51H84 51" Rear Projection HDTV-Ready Television

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Toshiba 51H84 shaking screen on the sides

Its a Toshiba 51H84 chassis TAC 470. I purchased it new from the store in july of 05. I hope its worth fixing, because i can't afford to buy a new big screen and i can watch a little one anymore. The problem happened one morning. I was the last one to watch it, and it worked fine the night before. the next morning turn it on and she screend shakes on the sides. the converge is fine. It in focus just shaking. when you hit the touch focus the first set of lines are not on the screen like they should be. I had it unplugged for 4 days then tried to plug it in and try again. but same thing. its not the cables because it does this with nothing plugged in to it also. I've looked at every page of this website for a solution or something like my problem to get me started, but i couldnt comeup with anything. My two kids are driving me nuts.Please help..

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Posted on Jan 02, 2017

  • 1694 Answers

SOURCE: Toshiba 42H81 Rear projection "Convergence problem"

Also,check micro fuses F851,F852,etc.
and with a good digital meter, check resistors feeding B+ to
convergence circuit.
I have been using Stk392-110T made by Toshiba with no re-calls.Hitachi also has an upgrade IC.
And be sure to check your soldering of IC pins--good connect,
with no short.....T.

Posted on Oct 25, 2007

eagle338
  • 4889 Answers

SOURCE: Red color convergence on Toshiba 57H81

Often convergence issues do not require the entire board to be replaced. You can resolve it by replacing the convergence ICs. The part in question is STK392-110. You will need two of them and they cost around 10$ each. But replacing them is a pretty complicated procedure and I would not suggest it to someone without prior experience. A service manual should get you started in the right direction if you are planning to do this yourself.
https://www.completeservicemanuals.com/toshiba/crt-projection-television/57h81-service-manual/prod_1128.html

PS
: Disconnect from the power supply before you start the repair. Also read the legend, the hv circuits are denoted by a special symbol, so you will know what you shouldn't touch.

You may also need to replace the nearby resistors that may have popped the IC in the first place. Read the service manual for further details.

Good luck,
Sai.

Posted on Apr 01, 2009

  • 5 Answers

SOURCE: Toshiba 50H13 blurry picture with white line on right side

replace all the surface mounted electrolytic capacitors on the hyper module. also called the scan converter module. this is a common trouble. what a nasty job. good luck.

Posted on Jun 24, 2009

SD Tech
  • 14553 Answers

SOURCE: the convergence is off. When I try to use touch

Ok, we go to solution of your problem===The pico fuses are green and on the main power board--have you removed the back and looked inside--most of these sets have the two STK-392-110 on the main board to the right-they are usually on the left edge of this board on two very large metal heat sinks--chips are about 2 1/2 inch wide X 1 1/2 inch tall--is this how your set looks inside? they will have the number printed on the black face of each chip in white--The fluke meter will allow you to check all the grey protect resistors--most are 1.8 ohm and the pico fuses will be near the edge of the board to the left----All I expect from you for help is a vote here--if you remove the back do you see the chips?

Posted on Sep 19, 2009

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Slinteriors
  • 8617 Answers

SOURCE: Trying to manually fix color convergence on Toshiba 57H81

The convergence ICs and the six 1.8 ohm 1watt resistors need to be replaced. You can get the convergence repair kit for your model at www.tvrepairworld.com which has the Two Convergence ICs and the six resistors plus the CD with instructions on how to do the repair.

Posted on Dec 02, 2009

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