Question about Toshiba 57H81 57" Rear Projection Television
We have a toshiba 57" rear-projection unit. last fall, it began to start up with the picture being wavy and kind of jumpy, would clear up after about 10 min. now, it's never clear, all written words/numbers are unreadable, images seem to double-up in a jumpy way (like ghosts, but farther apart), sometimes the color isn't correct momentarily, and vertical lines appear. have tried turning it off for a while---no help. have tried the "touch focus" button on front of tv---when procedure is finished, a message reads, "touch focus error". have tried adjusting everything else i can think of/find on menu choices and in manual, but nothing helps. can power surges mess things up like this? is it worth repairing? and what kinds of repairs are we looking at and at what cost?
It's the hyper mod board. I've replaced many of these.
Posted on Oct 09, 2008
This is crap
Posted on Feb 13, 2008
It could all be one problem A simple capacitor in the power supply circuit,or in the sweep power supply. But it could also be a combination of problems like regulator, convergence,or tuner problems. My bet would be in the regulator circuit of the power supply with bad capacitors. Your looking at around $250.00 to $400.00 for a repair price. Good Luck
Posted on Jul 24, 2006
Your description of the problem seems quite clear. It is a classic convergence failure. I do not know your capabilities so here is the procedure. If you aren't capable of TV repair get a reputable repair shop to do it for you. Cost shouldn't exceed $250 US depending on your location. Can power surges cause this? Power surges cause lots of problems but usually in the power supply. You can avoid that issue by getting a good Uninterruptable Power Supply like you would use on a Computer and plug the TV into it. They are not that expensive anymore and will pay for themselves the first power surge or electrical storm. Is it worth repairing, certainly. Here's the convergence IC procedure if you have the skills - If the convergence adjustment is not moving the beam chances are the convergence IC(s) are defective. If you know how to solder and understand TV safety you may be able to fix it. With power disconnected remove the back. You should see two large heat sinks with large ICs (3 by 6 inches) with about 30 leads going through the circuit board. Numbers on the ICs should usually be something like STK###-### or some variation with # being a number. These ICs control the position of the red and blue beams. If they go bad you can't adjust one or more beams. Replace them both as you don't want to get in there again in 3 months. Cost is not that much. http://www.tritronicsinc.com or http://www.partstore.com should have them at a reasonable price. Check the associated components in the circuit for problems, resistors etc, and replace any which do not check in specification. Before replaceing the ICs look at the circuit board closly for cracked solder joints. Resoldering any bad joints might just solve your problems and avoid replacing the ICs. Good luck and remember safety.
Posted on Jul 24, 2006
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Posted on Jan 02, 2017
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