Question about Sony FD Trinitron WEGA KV-27FS100 27" 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. no signal, so no cable

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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.

The above of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 10, 2008

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Posted on Jan 02, 2017

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