Question about Zenith A56M91W 56" Rear Projection Television

Sound No Picture

This tv has good sound but no picture and does not appear to have any high voltage. qx3402 seems to get very hot. any ideas

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29 Answers

The FBT (high voltage transformer) is bad.

Posted on Sep 08, 2007

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Why do we have sound but no picture?

This is an older picture-tube projection TV.
There are just a few things that can affect all three color tubes at the same time. One of these is "Blanking" and the other is the High Voltage.

Blanking happens when there is not a good signal to the TV, and the high voltage and therefore picture are shut off to protect the high voltage system. Make sure there is a good, strong signal to test it from, like a DVD player, otherwise the TV could blank off from low signal levels. A signal good enough to produce sound may not be good enough to keep the picture on, so that is not a good indication of good signal.

The other, High Voltage, is complicated and dangerous to work on and best left to a qualified technician to work on. High voltage in a TV can hurt or even kill you if you get across it.

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It is not a good idea for electronic products to be in storage for long periods of time. It is even a more poor idea to purchase used from a rental center; the result is more often than not a very bad experience.

With no picture, but working sound, it is a loss of the high voltage system. This is almost always failure of the high voltage autotransformer called the flyback and/or the HOT (horizontal output transistor) - which work together in producing the horizontal scan of the raster system and the high voltage to prduce the raster upon which the video picture is modulated.

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The repair costs will be over $150 but not more than $300; depending on the exact parts that need replaced.

But: try the hard reset and the vibration/whacking test first to see if the moving business caused failures.

Hard Reset: Unplug for 4 hours, then try again. Do it twice.

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in your tv is malfunctioning high voltage, the audio is generated without the help of high voltage sistem how happens commonly in many other tv

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The problem with your television appears to be in the high voltage power supply . This power supply supports the high voltage on the anode of the picture tube, and the voltages for the picture tube, and other parts of the TV. If you do not have a background in electronics, might I suggest that you have a TV technician to come to your location and work on the TV.

I hope this provides some help

Thank you

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