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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Mitsubishi CK-3527R Image Collapsed
Received this TV from a person who said it had problems at times. I worked
on projectors (Sony, Barco and Hughes Aircraft) back in the early 90s, and hoped, with some input from others, I might be able to get this unit working. The person who had it said that at times it would collapse down to a single horizontal line. I have had the unit approx. 2 weeks. What I noticed until today was (when the unit was first turned): Some fold-over on the screen top (about 5% - 10% image fold) Extreme brightness (you could still read the screen, but it was overly bright). Both of these would gradually correct themselves within 2-3 minutes, and the TV would run just fine. Today, sadly, the collapse monster hit me. So now, when turned on, I either see: A much collapsed picture (about 25% of the full screen, dead centered on the CRT). Or an extremely collapsed image (maybe 5% of the full screen). Any help or schemos would be greatly appreciated. Charley |
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You need to ESR test the capacitors in the vertical circuit for the
initial foldover problems, especially the pump up capacitor on the vertical output. The total loss of vertical could be related to the output running hot due to a couple/few weak capacitors in the vertical circuit or failing solder connections in the vertical circuit. David "CharleyT" wrote in message alkaboutelectronicequipment.com... Received this TV from a person who said it had problems at times. I worked on projectors (Sony, Barco and Hughes Aircraft) back in the early 90s, and hoped, with some input from others, I might be able to get this unit working. The person who had it said that at times it would collapse down to a single horizontal line. I have had the unit approx. 2 weeks. What I noticed until today was (when the unit was first turned): Some fold-over on the screen top (about 5% - 10% image fold) Extreme brightness (you could still read the screen, but it was overly bright). Both of these would gradually correct themselves within 2-3 minutes, and the TV would run just fine. Today, sadly, the collapse monster hit me. So now, when turned on, I either see: A much collapsed picture (about 25% of the full screen, dead centered on the CRT). Or an extremely collapsed image (maybe 5% of the full screen). Any help or schemos would be greatly appreciated. Charley |
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