Question about Sony FD Trinitron WEGA KV-32FS120 32" TV
If you immediately turn it on again, red background persists. 5min later it turns off. Let set for 1/2 hour and color comes back until it seems to heat up again. Any thoughts?
Hello jim .. that could be a short from grid to cathode in the picture tube ..usually thats just a loose flake of phospher and can be knocked out with a special electrical gadget .. sometimes called a cathode beamer .. some times we used to use a charged capacitor to knock out the short .. not sure if anyone does that anymore .. sometimes you can kick loose the particle by tapping on the neck of the CRT with a plastic screw driver handle (not hard) .. there is another possibility .. on the back of the CRT is an electronic circuit board .. there are three larger transistors that drive each gun ... be careful because there is about 300 volts on those transistors ... but if you touch each one you might find one that is cool .. the others will be hot or luke warm .. the cool one is likely shorted (if your screen goes to bright red) ... that will give you full brightness on that color .. so yours would be the transistor for the red gun ... once in a while there is a bad IC on the main board that drives those high voltage transistors also a bad solder connection is seen once in a while ... a volt meter or scope would quickly narrow down the possibilities .. since the problem is thermally related then you might be able to pinpoint the part by using freeze spray to cool one part at a time ... sorry this is so technical but its a technical problem .it would take a good tv shop only a few minutes to zero in on the problem but they charge so much anymore that its a risk unless you have an agrement on estimate beforhand . ..
Posted on Oct 05, 2009
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Posted on Jan 02, 2017
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