JVC AV32920 Horizontal black lines running thru picture. Picture condenses to a single horizontal line in the middle of the screen, audio is fine. When I bang the sides of the set (old fashioned manual solution) it sometimes improves. Sometimes, all is fine. Sounds like it is deteriorating. Is this fixable? It's an old set, so is replacement more cost efficient?

Hit your TV lightly on left side or right side or on top & then observe ..........you will get normal picture or it comes & again it goes....if it is happening like that then following is the situation..........after 4 or 5 yrs in some TVs on main board ( also on CRT circuit board ) at some soldering joints crack develops....then due to loose contact picture becomes small in size or abnormal width, or rolls etc ...........when we hit that lightly then those loose contacts joins temporarly & again picture appears normally for some time............so solution is .....TV main board & CRT circuit board should be observed carefully & most of the joints should be re-soldered.......only a good service engineer can do that........even after hitting TV lightly if there is no response then main board has to be checked completely........in your case iam sure it is loose connection problem.........joints should be re - soldered ...100% it works again ................this problem cannot be solved by user unless user has idea about components( resisitors, transisitors, diodes,...etc) , have soldering iron , multimeter & other tools....................so contact good TV service engineer ........good TV service engineer will charge very less ...absolutely there is no need for new TV........if soldering joints are properly soldered then your TV will work for 1 more year ( minimum )......iam from bangalore - 09986222774 - [email protected] ( computers, laptop, printers, etc )..............