WELL FIRST U HAVE TO SEE WHETEHR THE SUPPLY FOR VERTICAL SECTION IS OK.IF ITS OK THAN.CHECK FOR SOME DRY SOLDER AT VERTICAL SECTION.OR ANY LEAKAGE CONDENSER ,AT LAST REAPLACE THE IC VERTICAL.IT WILL BE OK'
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Vertical scan output failure. That is the reason for this horizontal line, right across the center of the screen. Check and replace damaged component/s at it vertical scan output section circuit. Check the solder terminals of the vertical scan output IC; for any loose solder points. Contact any service technician, if you're not handy in electronics.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to TV screen are given with illustrations. You can get an idea about the fault to an extent.
A vertical line means the line is up and down in the middle of the screen. That would indicate that the vertical IC and the surrounding components are working perfectly. A vertical line as described is the result of a lack of horizontal deflection (to move the beam from side to side) Since the high voltage is obviously OK, the problem is most likely a bad solder connection in the horizontal yoke circuit. Examine the bottom of the PC board in the area of the flyback transformer, and yoke connector (has four wires Red, Blue, Green, Yellow).and the pincousion coils, capacitors, etc in between. Flexing the board in that area may cause the problem to come and go. Resulting arcing should also be visible. BE CAREFUL, as hazardous voltages are present in the circuit!
In most cases the vertical output IC and possibly a fusible resistor off of the high voltage transformer are bad. The vertical output IC is located on a heat sink and usually right next to the vertical yoke winding connectors that are green and yellow in most sets. Please take a moment to rate my answer..Thanks...
This Problem is usually caused by Leaky Capacitors in Vertical deflection circuit.
If you are handy with electronics,
Get a can of FREEZE Aerosol.
Open the Back Cover.
Put a mirror in front of TV.
Locate the Vertical Circuit.
Turn the TV on.
Spray FREEZE on top of individual Capacitor to see if it corrects the problem.
If it does, Replace that Capacitor.