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My picture tube just reduced itself to a thin line running across the width of the set.

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Its a vertical ic failure.sometimes if its a loose connection on the ic itself if you tap on the side of the set the picture will open again interminttently. but id the ic its bad nothing is going to happen till you replace it and sometimes it will take a fuse resistor with it and a couple of capacitors as well depending on brand , model and year set was made.

Posted on Jul 10, 2008

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1 Answer

Lines across the top of screen


If this is a picture tube set (not a thin screen), then you have a bad electrolytic capacitor in the vertical circuit. Just about all picture tube sets that I've worked on that get lines at the top was caused by a bad or leaky cap and is a common problem w/ most sets. There's a very slim chance it could be the vertical ic but normally when it goes bad you will have nothing but a thin white line running across the center of the screen from left to right. If it's just a capacitor, the part would only cost a couple of dollars at most, however there's no way I can tell you exactly which one to change w/ out looking in the set. A repair shop would probably get between $30-$50 to fix it. If you can give me the model number of the tv, I can see if I can you some more info.

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No,Ur vertical/horizontal IC is shorted or cold soldiers.Could be the parts that support the IC is also.

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hi
you may click the right button of your mouse and go to the properties.From there you can adjust the screen resolution.

Jul 01, 2009 | Computers & Internet

1 Answer

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1 Answer

Insignia 32" Tube TV NS-RTV32


The vertical output IC LA7847 is failing. It will likely fail permanately and you will have just the horizontal line. The set will require service. Just do not run the set very long in this state. That thin white line can likely burn into the crt phospher and will show all the time thus ruining the glass picture tube...

Jun 05, 2008 | Televison & Video

1 Answer

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This is called field-collapse. Either

1. The problem lies in the vertical deflection voltage-doubler circuit. The usual fault is a single capacitor of 100uF/35V that has failed. It is normally connected to a rectifier diode right at the vertical IC. Replacing the capacitor usually gets it working perfectly again.

or

2. The vertical drive IC has failed.

If you are finicky around technical work, then a reputable local repair shop in your locality should do it quickly for you and charge only labour.

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1 Answer

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this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!

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1 Answer

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Those lines sound like "retrace lines" and several things can cause them. The most common are shorts inside the picture tube and shorted semiconductors in the video driver circuits. They can also be seen if the blue screen voltage is too high or if someone has tampered with the screen voltage control.

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I would suspect a connection breaking down as the set heats up. A shop will probably have to put the set in a stand to hold it while they check for loose connections or defective components inside. Not a DIY job by any means. If this line went completely through the picture either vertically or horizontally and stayed there then this would have indicated a failure in the Panel itself. A thin Line any where on the screen consisting of one pixel in width is a Panel Failure according to Hitachi.

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1 Answer

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I really dont understand the problem Could we see a picture of this please?

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