Question about Toshiba 42H81 42" Rear Projection Television

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Bad picture on Toshiba

I have a 2004 Toshiba 42H81 that plays sound, but the picture is awful. When the power is on the TV but not on the cable box, the screen is slightly blue and has a few vertical white lines that appear and disappear quickly on the right hand side of the screen. When the cable box is turned on, the picture is unrecognizable because of the horizontal lines going through the entire set. The vertical white lines are still there as well. I've searched this site for a problem like mine, but didn't find one. Any solutions are appreciated.

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  • Jenelle Terwilliger Mar 06, 2007

    Found the solution on another website (and has nothing to do with the tuner) soon after I posted this question here.
    Thanks anyways.

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1 Answer

Try changing tuner

Posted on Mar 06, 2007

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Toshiba Regza 47wlt66 has sound but no picture


Hi.

If you have picture but no sound and problem is not cable settings or source selection, then the faulty part is usually the inverter.

Firs test the TV. Check if there is on screen display (the menu). If OSD is displayed, then the problem is either cable/source settings or a defective input circuit. Try also disconnecting power cord for ten minutes and then up to one hour. Power drain may fix temporary faults.

If all that does not work, then the problem is either inverter or power board. In some case the main controller board may also be responsible.

The inverter is a power board that converts DC voltage from PSU into AC high voltage, powering the whole backlight system. When there is a problem with the inverter the whole screen will be completely dark, while the sound keeps going on.
A problem with the inverter will mean that either inverter is bad, power supply is bad and does not power the inverter, or main board is bad and does not turn inverter on. Those are the three parts that must be tested when the inverter does not fire up ( sound and dark screen). Here broad description of how to test the three parts: Before proceeding...

From a user level point of view, all you should do is disconnecting power cord for fifteen minutes, and testing the TV with different connected devices and different cables (e.g. with a DVD, a receiver box, using a SCART and using HDMI).
Disconnecting power will allow a power reset that sometimes can fix temporary problems (usually not sound but no picture).
Testing different cables and devices excludes the chance of the problem being given by a bad connection.

If that does not work, call the manufacturer at the number listed in the owners manual. Verify warranty status (warranty may have expired 09/10). Make present to the operator that the TV is just out of warranty, and that the fault occurred without you making any wrong use of the TV. Some manufacturer in some case apply special condition.

Here replacement parts for most flat panel TV models:ShopJimmy.

See also:
PartStore

Regards.

Ginko.

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1 Answer

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1 Answer

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1 Answer

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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

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1 Answer

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