Entertainment Center: TVs, Stereos, VCRs and DVDs - TV Turns off
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willkeeptrying
05-06-04, 07:58 PM
Our Portland 19" TV vintage 1983 likes to turn off. We could be watching for anywhere from 15 minutes to 2 hours and it just turns off. I read about low voltage power supply and bad vertical or horizontal transisters. When it turns off (no picture no sound) the number display is still lit and responds to the remote by going dark and then lighting up but there is still no sound and no picture. Any ideas?
Thanks,
Jeff
Thanks,
Jeff
snuffs
05-15-04, 09:25 AM
you may have a bad relay in the low voltage power section. can you hear it go off, ( a clicking sound ), then clicking sound when it powers up again. Is it sensitive to a good old whack?
the set may appear to be on, and in fact many stages may be on. listen for high voltage, haer the static noise on startup and feel the same on the front of the tube, is it there? my guess it is a low voltage power supply problem. the set does not reset itself, when it goes off, cause the reset line does not respond to the commands of the remote.
is this an easy fix?, probably for a technician. Is it worth repair, probably not? new 19' sets are probably cheap today, and when all is said and done the repair may cost close to what a new set costs. good luck snuffs
the set may appear to be on, and in fact many stages may be on. listen for high voltage, haer the static noise on startup and feel the same on the front of the tube, is it there? my guess it is a low voltage power supply problem. the set does not reset itself, when it goes off, cause the reset line does not respond to the commands of the remote.
is this an easy fix?, probably for a technician. Is it worth repair, probably not? new 19' sets are probably cheap today, and when all is said and done the repair may cost close to what a new set costs. good luck snuffs
jughead
05-16-04, 06:38 PM
I'm going to make a wild shot in the dark here and say that you MAY have a problem with the horizontal output final or driver transistor. The trouble may, in fact, not be the transistor, but the heat sink for the transistor. It could be that the transistor is overheating because the mounting screws for the transistor are loose and the transistor overheats after operating awhile because it can't disipate enough heat into the heatsink. Since a lot of the low voltage power supply voltages of TV's of that era were derived from the horizontal section, problems in that area often caused loss of video and audio. I remember a TV set I inherited when I got married that had that exact problem. In my case the horizontal driver would go out and the TV set would loose picture AND sound. After a while I would keep a spare driver transistor inside the TV set. Once the set went out while we were watching a good movie. I had the new transistor installed before we missed much at all. Over the years I fixed the set that way about 3 or 4 times. The TV was used for over 10 years before I finally got rid of it. I still have the wife though.