Question about Toshiba 50H81 50" Rear Projection Television

3 Answers

Squealing noise from lower back and now waviness

For at least a month I've had squealing from the back of the set (which I thought was the power strip until this week) when I turned OFF the tv. Now it sometimes makes the noise when the tv is turned ON and waviness occurs in the video (just in time for the Super Bowl and we're in Patriots territory). Any thoughts? The set is around 5 years old.

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  • lenupinnh Feb 01, 2008

    This is a rear-projection tv. I didn't think they used CRT's. Is that wrong?

  • lenupinnh Feb 01, 2008

    Until I get this problem fixed, should I leave the set always on or leave it off as much as possible (before the Super Bowl at least)??

  • lenupinnh Jan 13, 2009

    Thanks coolguy008,

    Sorry for not replying sooner. Eventually I got a local servicer to come out and look at the tv. He found the power supply board was the issue but TOSHIBA was no longer supplying replacement boards! The tv was only about 5 years old at the time. So he being a good trooper decided to replace all of the chips on the board, which he knew would be a lot of work, especially on the part of the board which was heat-damaged. It took him forever, since he was fitting hours of this work in between other jobs. He did not charge nearly enough for all the work and he was not sure it would be successful. Anyway, it did work. But after several months it started making squeeling noises again, and now does it when on and for quite awhile after being turned off. But no obvious distortion of the picture yet.



    When that happens, I'll break down and buy a new set. We just got a Samsung LCD with ClearVu (also 120 Hz) for our bedroom and the picture is so much better it blows my mind, even though both sets are hi-def. Its like going hi-def all over again.

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3 Answers

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  • 1,512 Answers

A leaky crt uummm Jaime may be referring to a leakty eht block... flyback assembly... probably a better work to desribe it. You willl have some very high nd dangerous voltages floating aroung in the back of the set. But by inspecting it under dark conditions, you may be able to see if it is leaking... Check for dry solder joints about the flyback transfomer. BE CAREFUL. High voltages are STILL PRESENT after the power if off in these stages. Taking it to an agent would be a better idea if you are at all unfamilier with how to ADMINISTER CPR TO YOUR SELF

Good luck...peace out

Posted on Feb 01, 2008

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  • Master
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HI,
First thing to do is the reset and the whacking test. I give this a 50/50 chance of clearing it up.

ONE: Disconnect the power cord for 4 hours. Then when you power it back up the internal soft codes will automatically reset to factory defaults.

TWO: The whacking test is to just bang or smack the set with your hand on the back, side, top, etc., to see if there are loose connections or cold solder joints inside that are acting up. If so, the banging should knock them back to normal and the set should restore. You might have to use some creative banging and some have had to put a book or magazine under one corner to torque the chassis enough to get it to work reliably.

If these two procedures do nothing then:

The manual always knows the best.Go through the manual carefully and u will find the solution to ur problem..

Click here
once u are at the site enter ur mail id and click start download..

You need to have adobe acrobat reader to view the manual in pdf format.
Click here to download it if u don't have..


Goodluck,
Don't forget to rate me as fixya..

Posted on Feb 01, 2008

  • Priya darshan Feb 01, 2008

    You have to leave it off as much as possible so tha no extra damage is caused to it..

  • Priya darshan Feb 01, 2008

    About the cost of repair.... It will be over $150 to $200

    It is a power supply chirp and is caused by overload when the
    brightness is too high and is drawing too much current. There is either
    something wrong in the video driver amplifier or the settings are too
    high for the set.



    For example, if you are using the set in a well lit room and trying to
    compensate by pushing the brightness settings up too high, that could
    be the cause.



    Other causes could be a shorted out electrolytic capacitor or bad conductors foils on the printed board.



    You may need to have it looked at by an expert who can take a series of
    voltage measurements in determining where the problem is. (There are
    hundreds of parts inside the main power supply section of this set; a
    tester must know what is going on in order to isolate the problem
    specifically. It is not a home remedy.)


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  • Master
  • 2,267 Answers

If that noise is cause by a leaking CRT, I would call Toshiba and ask them nicely to fix it. A leaking CRT it may be a fire hazzard and they will hopefully willing to do the repair even if the TV set is out of warranty.
Give it a try.

Posted on Feb 01, 2008

  • Jaime Hernandez Feb 01, 2008

    I was reffering to a coolant liquid leaking from the one of the CRTs and getting close or near the high voltage area, causing the high squealing noise. I have fixed a few of these TV sets with the same defect.

    Just becareful if you are going to be working near the high voltage area.

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