There are white lines at the top of the tv that somtimes look like image folds over about 2in, i,ve similar posts here saying its a capasitor, could you tell me which one it might be on this model tv, or where it might be located on the board, or diagrams for it and it it could be checked with volt ohm meter..
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Vertical scan output section circuit fault. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
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It sounds as though you can see Transmission lines which are sent out with any broadcast at the top of an image, The TV should normally blank these out, i suggest checking your horizontal and vertical settings
What you are experiencing is called “vertical fold-over” the vertical size of the picture is too big on the top and is folding over, causing retrace lines to show on the screen. The reason why it comes and goes is because it is caused by a leaky cap in the vertical circuit. Replacing this capacitor will fix the problem, finding it is another. If you are handy with a soldering iron and would like to attempt the repair. I will try to help you. Let me know. If I have managed to answer your questions and have helped you, please help me, and rate this suggestion the highest FixYa rating. If you cannot give this post a “FIXYA” (Two Thumbs Up) rating then please comment to this post and I will try to help you further. I try to provide the best FixYa experience.
There are probably two capacitors that are bad in the vertical circuit. Not too hard to replace if you have any experience at all. Find the vertical output IC ( usually IC451 or similar ) and simply change the closest electrolytic capacitors. A professional can do this easily. Could cost up to $150.
Your posted description is a known (common) problem for the JAV-27230 and should be easily repaired. The vertical capacitor (C424 - 100uf/35V) needs to be replaced. It is relatively cheap and can be bought from any electronics parts store.
in some instances, it could be the vertical IC starting to fail or even a simple case of cold solder.
As always, extreme care when repairing the insides of a TV unit since HV can still be present even when off and unplug. A little knowledge of electronic components and use of a soldering iron should do just fine. Should you not be comfortable doing a DIY, then perhaps you can ask the assistance of a buddy who has some soldering experience.
Hope this be of some 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!
Repaiur or replacement? It's Your call! If you know Solid State repairs, then worth a try. Most likely a bad Electrolytic capacitor in the Vertical Oscillator / Output section. Do not waste time identifying faulty one, but change all at one go. Even if one is faulty, the others must have started drying up, and will cause problems in the future.Remember "An Ounce of prevention is better than......"