Question about Televison & Video
Model DP32640 -- no picture and sound comes & goes -- had an earlier problem in that picture would not come on or wasn't right on the screen and sound off |& on but could correct by turning unit off & on 2 or 3 times and then it would work okay. However this doesn't seem to correct it -- is there a way of rebooting the TV to correct this or is it a throw away?
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Posted on Jan 02, 2017
SOURCE: TV Black-out
The horizontal sweep circuits are at fault. There is an intermittent loose connection. It is likely a loose solder joint and it may be possible to spot if you have a magnifying glass and an eagle eye. The heavy lead that comes away from the side of the picture tube (CRT) will lead you to the Flyback Transformer area. Stay away from that wire - it'll knock the soup out of you if you don't know what it does - even with the power off. Don't try to re-solder everything in sight. You could do more harm than good. Examine the circuit board - you may be able to wiggle the cold solder joint and see it move where it shouldn't be moving. Good luck TVGUY
Posted on Jul 26, 2006
Lets try something ,turn the set on and put you forearm in the face of the picture tube if your hair stand to static it means you have high voltage and your set is missing possible the screen or filaments volts,if the hair in your arm does not stand your set is missing the high voltage and the problem is related to the flyback but it does not mean is bad ,it could have a loose conection in one of the legs or in the near area,next time it happens tap on the side of the set to see if it reacts if it does you know you have a loose conection.If you are familiar with tv service this will be a good place to start but if you are not too familiar be safe and call for assistance from a servicer.Let Us know if you need more information and how it goes.
Posted on Oct 13, 2006
Protection circuit fault kicks in. No vertical Deflection (V STOP),B+ over voltage protection (OVP), This is about a $150 -$200 to fix.
Posted on Jul 04, 2007
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
Posted on Feb 02, 2008
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