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It sounds that there is any loose solder terminals at the main board, especially with the vertical scan output section circuit. It will be best to contact any service technician to get it repaired. Gopakumar Gopalan Google
no rocket science here - my son fiddled with the cable cord attachment, until presto, the screen became sharp. Then we moved away as fast as possible, lest we shifted it and it put us back at square one.!!