I have a similiar problem happened after 1 year of operation
White line 2' top of screen with image on 3/4 of screen tech said its the veritical invertor (he did not look at it ) this tv was cheap 20ms233s and did not last over a year i don't see paying $50.00 some bucks to fix and then have some other cheap made in china part go out
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Re: i have a similiar problem happened after 1 year of...
Hi and welcome to FixYa,
Your described problem indicates a failing capacitor in the vertical section. The erring capacitor would probably cost you less than a dollar and could be repaired in less than an hour. It would take more time to open the casing and remove the board in preparation of the work. The trick then would be identifying which is the capacitor. Normally it would be the biggest of the bunch in the vertical section. Often it would have a blistered/leaking top look. There are only two (2) solder points and is polarity sensitive. If you are considering a DIY (do-it-yourself), it would be wise to exercise caution as their are extremely high voltage present inside a TV set even when the power is off.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
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This is a symptom of what is generally a leaky or open filter capacitor in the vertical sweep circuit. Vertical foldover, where the image actually is reflected upside down an inch or so into the top of the picture, is common in this problem. There is an IC that controls the signal and sometimes it needs to be replaced, but more often it's one of the filter capacitors nearby. Any competent technician can fix this problem and the capacitors only cost $2-3 or so if you can find the correct value at Radio Shack (that's if you pay full retail for them). A good service tech will probably have these on hand. Testing them is easiest with what's called an ESR meter (stands for Equivalent Series Resistance) and the better ones don't require you to unsolder them from the circuit board before testing. The most expensive part of this repair is going to be the technician's labor. They're good TV's, this is just a problem common to most TV's in general - mostly due to aging of the capacitors from years of heat. A higher quality replacement capacitor will solve the problem for the life of the set.
The original white line problem was caused by improper adjustment of the vertical size for which there is an internal adjustment.
The current problem could come from two different sources, one an adjustment again, the other from a capacitor that is losing capacitance and gaining losses; = sick.
If you are fortunate enough to have a surviving TV repair in your area, none of these problems is expensive to find or correct.
Don't be surprised to find the only TV shop operating out of a messy garage since those of us doing this kind of service are dying off and the price one can charge for labor has shrunken to the point that a real business address is too expensive to have.
TV FINE UNTIL 2 NIGHTS AGO HAVE HAD 4 YEARS, STARTED HAVING A FOGGY SCREEN WITH WHITE HORIZONTAL LINES. HAS SOUND
A FOGGY SCREEN WITH WHITE HORIZONTAL LINES. called retrace lines please check
1 screen control on eht transformer is mituned
2 supply to screen of crt
3 supply to rgb video output is absent
4 connector loose
5 crt base loose
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!
1.Are these lines only in the upper 1/3 rd portion of the screen?And is there a clear demarcation between this area and the lower portionb, where the image is perfect?
2.Or is thin Horizontal lines evenly spaced around an centimetre apart?
If it is the first case, then there si a problem with your TVs SMPS. It is not generating the required regulated 110V required for the TVs functioning.
If it is case 2, then there is a simple adjustment at the back - 'SCREEN'. This adjusts the Screen Grid Voltage, and by slightly lowering it, this problem will go away.