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This is a common problem on certain models of Philips Magnavox TV sets. The most common symptom is the screen will shrink and expand over and over. After the TV heats up for a while the video will work like normal. After a few weeks or months your TV will eventually stop working and not have video. You can get complete parts and instructions from www.TvRepairKits.com
The fluid is a fairly easy replacement. They just need to remove the CRT with the bad fluid and drain the old fluid and clean the CRT and then replace the fluid. The Shrinking is just a Vertical Deflection problem which is also an easy repair. A new Vertical IC and a couple Capacitors. In my shop it would run @ $200.00 to fix both.
If you have the following symptoms check the site www.TvRepairKits.com . They have a repair kit for this problem.
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!
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!
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
you can ask a good tv Technion man, since if it happens to be like that then in coming day u will have to face problems. So since this very common problem which will arise in old tv. Actually the real problem is that, some parts in the board may have become weak or the molded part in the board may have fallen down ,so changing that particular part or molding again may fix that problem. Since i am not an Technion I don't the right terms to help u.I have see this problem in many places and
don't worry your picture tube is well and good.
Most likely cause would be a loose solder connection that expands as the set warms up until it no longer makes a connection. You may get the blue to come and go by hitting the side of the cabinet after the set is warmed up awhile. (don't hurt your hand doing this, and don't keep doing it to "fix" the set. The connection will have to be located and repaired). Otherwise, there could be a component going bad, including the blue picture tube.