Question about Sony FD Trinitron WEGA KV-36FS120 36" TV

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Sound but NO picture

When I turn my TV on I hear the sound but no picture. The screen remains black. Even when I use a dvd I can hear the dvd but cannot see the picture. Also as I turn the channels I can hear the static in the channels changing but again no picture. I also try pushing the TV/VIDEO button and it will swith back and forth but i do not see anything on the screen. This is the 32 " WEGA. Thank you

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Hello ashleewith2e,

This sounds like a high voltage problem or a picture tube issue (burnt out filament). I would first determine if you had high voltage at the anode of the TV by using a high voltage probe. If you do not have high voltage then I would suspect the voltage doubler, the IHVT (Integrated High Voltage Transformer) or the Horizontal Output Transistor (I doubt this only because you don't have a power supply failure and I would expect this in a modern TV since the high voltage supply is tied to the low voltage supply), the more likely suspect is the voltage doubler. Second possibility I would check is the CRT socket board and CRT filament. Unplug the TV and with a multimeter set to read resistance check to see if the filament pins read a low resistance if so the filament is good. Plug the TV back in and turn it on and check the voltage on the CRT board and compare them to the schematic values. These two tests should localize the issue. Now, If you have a background in electronics, this should be no problem to do, however if you do not have a background in electronics, I would suggest that you have a qualified TV technician troubleshoot and repair this TV set.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Dec 07, 2008

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