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

1 Answer

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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.

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