The picture has developed a dark horizontal line few inches from the top of the screen. It is present on all input sources. Color varies slightly depending on background so I am assuming that it is blank.
Any ideas on the cause and probable costs to fix?
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Check the input connections. If Ariel connection, or other video input connection from any external source have loose contact, or wire broken, this type of interference can occur to picture. Gopakumar Gopalan Google
Hi, Its because of Over Voltage of Screen (G2) to Blue CRT. Take off front lower cover (speaker grill) and unscrew board. There you will need to find Focus Block mounted having 6 control knobs. 3 knobs are for Focus control and 3 are for Screen volts control. Find Blue Screen control knob and turn is Counter Click Wise slightly until bluish shade disappear on screen including few blue horizontal lines. If you select AV input to adjust that will be fine as you do not need to wait for dark-scene.
Check capicitor in vertical hold circuit. You should have solid knowledge of electronics repair before attemping repair. TV's can emmit harmful radiation, and produce voltages up to or in excess of 30kV.
Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.
Unfortunately there isn't any way to repair your tv as the magnet has distorted the tube that is in the tv and with CRT becoming obsolete the repair is likely to be very costly so probably your chaepest option is to buy a new tv .
Your whole problem my freind is dryed up capacitors. You should go, if you have the technical ability to replace these capacitors, to http://servicemanuals.net, download the schematic diagram, and start replacing the waveshaper capacitors in the vertical drive circuit.