Question about Sony FD Trinitron WEGA KV-36XBR800 36" TV

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20" sony trinitron KV-20fs100 no signal

Video inouts do fine but the cable input has no signal.
no cable box ....plug directly to the TV.
We check with other TV and cable is fine.

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  • beach1 Aug 10, 2008

    We're having the same problem with our 32" Sony Trinitron. Anybody have any suggestions on how to fix?

  • DiscereVita Sep 30, 2008

    I have the same problem on a Sony tv. I even tried using an antenna which also gave no signal. Both the cable and the antenna works on an older tv. The Sony tv used to work fine, but all of a sudden the cable stopped working.

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  • Sony Master
  • 1,635 Answers

It is very possible that the tuner and IF modules have failed. On more rare occasions, the supply voltage to these modules may be missing because of failed components in the regulator circuit that feeds the front end area.

Some other areas of failure can be the uPC controler may not be addressing the front end functions, or the input switching control is not working properly.

The mentioned problems would require an experienced TV tech who has the service manuals, and the tools and facilities to troubleshoot and service your set.

If you decide to have the set serviced ask for an estimate. It may be expensive to fix.


Jerry G.

Posted on Oct 01, 2008

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Hi,

If you have confirmed that there is cable signal but the Sony TV does not sense it, then perhaps the problem is internal to the TV. Primary suspect would be the tuner block/assy and/or its B+ supply. Often there would be two (2) voltages required; 12VDC & a 33VDC (varying). In some instances it could just be the zener diode.

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