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If you have any of the following problems you may want to check the site www.tvrepairkits.com for a repair kit. Most of the issue below are fairly common with the older Magnavox projection sets.
Symptom: Screen shrinks and expands - may or may not correct itself after the TV warms up. After a few days, weeks, or months of having the shrinking/expanding problem you may loose all audio/video but the power light will remain lit!
(Note: The below symptoms typicaly occurs after having the expanding/shrinking screen problem above)
Symptom: No Audio or Video but power light is on
Symptom: Audio works but no Video. Power light still work
Symptom: No Video. Audio is intermittent. Power light still works
This might be a power supply issue either in the switching power supply or in the high voltage power supply. In any case you will need a schematic, a voltage meter, and if possible an oscilloscope to troubleshoot this problem. If you do not have a background in electronics I would suggest that you take the TV to a repair shop.