Hello,
You are experiencing a lack of vertical deflection or vertical collapse. Since it will come back the first thing I would suspect is “ring cracks” in the solder joint in the vertical circuit, mainly the vertical IC. These suspect solder joint can be re-soldered and the television set repaired.
I would suggest that you contact a local servicer. If you are repairing the set yourself, be careful, there is always a risk of shock when dealing with electronics.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
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This is a problem within the vertical circuit. Since this seems to "recover" at times, it suggests that the problem is a connection one. If you can solder, resolder the connections on the vertical IC. This is a small flat IC attached to a heat sink with 9-11 pins. It may be marked LA7837 or something similar.
Try the resoldering and update this if the problem is not resolved.
Dan
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good day..i encountered 1 inch horizontal line on my television..then i open the and re solder the circuit on the vertical section but the problem was not resolved ..any idea,tnx
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