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you have leaky capacitors in the vertical circuit, you probably need a tv repairman to troubleshoot, but if you want to take the back off, find the vertical chip, and change the 4 or 5 capacitors around the vertical chip then good luck, also once in a blue moon, you can fix this by resoldering the vertical chip.
This is caused by a bad capacitor in the vertical circuit. If you can solder, you may be able to resolve this yourself. If you wish to attempt this repair, please update this and I will provide additional details and instructions.
Your described problem is indicative of a failing or near end of life capacitor in the vertical section. The capacitor (often called pump capacitor) would be in the neighborhood of 100uF 35V and physically near the vertical IC. In some JVC models, the vertical IC would be an LA7838 or LA78041 usually a single inline package on a heat sink.
Cost wise, the capacitor is relatively cheap a dollar or less. What would be more challenging is getting access underneath the PCB to de-solder and solder in the replacement.
Pls post back result(s). Good luck and Thank you for using FixYa.
Assuming the CRT is still OK, it could either be: 1. Screen Voltage is low; 2. G2 B+ is out (common problem is a mega ohm resistor open); 3. a resistor gone high (or open) in the DA converter of the controller IC circuitry.
Any of the above would require extensive knowledge of electronic circuitry and components, use of a DVM and a soldering iron. Perhaps your best bet may be to seek the services of a professional.
Pls likewise consider the age of the TV (if a couple of years) and/or the downtime and cost of repair,. it may be more practical to purchase a replacement unit.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
this symptom is what we called vertical fold-over. vertical fold-over is characterised by a white horizontal bar on the bottom or top of the raster due to the concentration or compression of the trace lines. it an image is present, the bottom or top portion is fold over. this is caused by a vertical deflection current with poor linearity, which compresses the trace lines at the bottom or top of the screen. this symptom is is caused by a defective sawtooth wave genetator circuit, or improper biasing or defective feedback circuit of the vertical drive or vertical output transistor/ic. the negative feedback circuit in vertical deflection circuit compensates for the linearity of the trace portion of the sawtooth wave. a decrease in the capacitance of the sawtooth generator capacitor is usually the trouble. but if you do not understand anything what i have written here, better bring it to a qualified tv technician for your own safety also. good luck!
By bottom up do you mean that if you flipped the monitor upside down the picture would be right side up but backwards? If so then the horizontal is o.k. since you are reversing it when you flip it. It sounds like it is just your vertical windings of the yoke have had their relative polarity reversed. Could be major or it also could be as simple as some one has put the connector on backwards.
Consult your local lab, at the end you're also dependant on their repair estimate.