Question about Toshiba 42H81 42" Rear Projection Television

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Toshiba 50 inch projection

Have a Toshiba 50 inch rear projection that will distort and bend in the center. Shortly there after tv turns off. Requires cutting power from unit to get back on. May take one time or several to get iot to finally work. Any suggestions?

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In the convergence circuit, where the amps themselves are soldered to the foil side of the board, may be ring cracked. What you're doing by forcing it to start is causing an arc to form between the crack until the heat has built-up sufficiently to expand that joint and make contact. Eventually you will burn out the amps, overheat the return resistors and/or open some of the pico fuses in that circuit and send the repair bill that much higher... Better to pull that board, get out a good soldering tool and some solder and a good pair of reading glasses and locate / resolder those joints that are ring cracked...
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

Posted on Nov 07, 2008

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if you are using a cable box, tried to reset. then tried to unplug any connectors that has been hooked to the component input of your tv.

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Need the model number to help as I am not sure of you have a RCA or a Toshiba

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I have an RCA 50 inch projection tv that all of a sudden looks like the picture is warped on the screen.I can not make screen adjustments with the remote to solve it.


Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:
ee1ca68.jpg

You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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Bad convergence IC possible - It's cheap if you do it your self, expensive if you take it to a repair shop. My Toshiba finally came on and stayed on after the IC's burned completely up and smoke poured out the back. Then mine stayed on with a distorted image. A good place for parts -> http://www.electronix.com/catalog/default.php/cPath/6

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Distorting


if it is wavy lines across the top it is probably the scan converter/ hyper bd they are becoming hard to find/expensive you can repair them but it requires many surface mounted capacitors and requires some VERY skilled soldering.

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