Question about Sony FD Trinitron WEGA KV-20FS120 20" TV

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White bar on top of screen

My sony tv has a lighted bar on the screen that appears when the screen goes blank. I heard it was called vertical blanking and there is a modification for it. Where do I get this mod and is this common for this 20" tv?

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Re: white bar on top of screen

It only 1 bar in the middle horizontal? They Call it Vertical Line, sometime looseboard, defectiveVertical IC, Leak capacitor in vertical section. need a Repairman Tech.

Posted on Apr 14, 2008

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How do I fix a Sony TV that starts then screen goes blank

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. Surf the site with patience. Pull up older posts.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

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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

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2 Answers

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1 Answer

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have a Mitsubishi TV 1993. Model CS-35301. The problem is that there is a white line that is running through a blank screen. The sound is fine just no picture. Have you heard of "Vertical Collapse?" I would love to save the TV. Hi nothing to worry just minimise brightness to avoid screen burn. "Vertical Collapse?" means one bright hor.line in the middle of screen. this problem can be solved 1 check vertical yoke connector or wire loose 2 check supply to vertical section which normally comes from EHT transformer check components in vertical section or print loose regards thanks

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Sounds like a bad connection on or in the vertical output circuit, or the drive circuit. Could also be the vertical output IC or the surrounding componets going bad. Good Luck

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1 Answer

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sounds like you have a vertical sweep problem. Where the fault lies cpuld be the vertical output IC the verticle b+ feed, could be the capacitors in the vertical circuit?? Your gonna need to troubleshoot thr vrtical circuit if your not a tech thin my advise is to take the set to a pro for sn est. Good Luck

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