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Monitor horizontal lines problems usually caused by a defective vertical output/driver ic. A missing supply voltage to the vertical output ic may caused similar faults which is one horizontal line across the display. Dry joints and missing vertical output pulse from vertical oscillator ic also could contribute the same symptom. If you discovered that the protection resistor (usually from 1 to 4.7 ohm) open circuit or burnt, then replacing it won't solve the problem. The resistor burnt or open circuit was due to a short in the vertical output ic. Thus you have to replace the vertical output ic and the burnt resistor together before you switch on the monitor.
hi if only a horizontal line across with no video anymore, you have bad either vertical ic or no dc supply b+( vertical ic ) or no output dc coming from the ic. if it is not totally a horizontal white line and you can see a video you must check leak or bulged capacitors at the vertical section near the vertical ic. hope this can help good luck.
Check all the electrolytic capacitors and solering points of the Vertical Output IC. The problem is with its vertical output stage. Replace all the electrolytic capacitors [5 or 6 of them] at the same time. Resolder the solder terminals of the vertical output IC, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals.
No, you may have 2 different problems. I would repair the vertical first. Check for 24v on your vertical output ic, maybe bad vertical output ic. If it is shorted, may draw down your vcc for your audio circuit. Check vertical circuit for open resistors or bad vertical output ic.
Hello The vertical sweep section of your TV is faulty. It may be either to a loose solder points at somewhere in that section of to the fault with the vertical output IC. Check all the solder points on the vertical output section of your TV. It is best to resolder most of the suspected soldering points, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals. If this does not help you, replace the vertical output IC with same type and number. OK.
This is a vertical deflection problem, These are the possible causes:
1) bad vertical coupling capacitor 2) bad vertical output IC 3) bad vertical driver IC 4) bad CRT deflection yoke
Troubleshooting needed: 1) using the TVs schematic locate the driver IC the output IC and the CRT yoke transformer. 2) using an oscilloscope look at the vertical driver signal it should be a sawtooth signal from the driver to the yoke (increasing in amplitude for each section, i. e. driver and output). 3) if no sawtooth patter is seen that is your problem, look for the component in the section where signal is entering but nothing is coming out. 4) replace the components
Now let me tell you something, don't continue to play the TV with the line present with brightness applied, this will burn the image of the line into the phosphorous coating of the CRT.