Question about Sony FD Trinitron WEGA KV-34HS420 34" TV

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Tv picture When turning on my mitsubishi black diamond 32"widescreen there is no sound (like tube warming up or ticking etc) and no picture comes through at all, i still have full sound.

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Sounds like it could be a problem in the vertical sweep curcuit as if the vert sweep fails it blanks out the video and screen drive so the tubs dont get a line burnt into the face of the picture tube. Have this checked out by a pro as I doubt if you can do this repair unless your an electronic tech.. Good Luck

Posted on May 19, 2006

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Posted on Jan 02, 2017

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I have a Sony Trinitron 32" tv. When I turn it on, it has started taking longer and longer for the picture to come on. Sound is fine. Now once the tv is on for a while, the picture goes black for...


Yes.... u must adjust the screen voltage going to picture tube....located on the CRT module>>>little board connected directly to picture tube (take back off TV and you will see ) play around with screen control on the CRT module......can be adjusted at times to keep from losing picture!!! tube is bad...i know sure looks good when showing a picture....TRY adjusting screen voltage ( YES while TV is ON>>>CAREFULL ) gl

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When a tv (Rear proyection) shows this coloration is the meanning that the red color is not there (the red color is generated by a red CRT). Now it can be really bad not having the tube working but before conclution make sure of this: (and if the red color gets back then the tube is ok)
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  • are the menu letters same as the picture looks or are they fine?
If we cannot see any red color back with this testing, still chances that a technician find an electronic problem that make the tube to be off. so don't rush conclusions and get to the end to save the tv with out replacing the red tube, but if all was done and nothing then the tv needs the tube replacing.

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You have to turn off the "automatic", so the TV will not automatically show you what it wants you to see. Then, if you select 16:9 , you will see true widescreen.
Since you cannot physically change the size or shape of your TV, the picture itself will be black on the top and bottom. Since not all programs are widescreen, sometimes the sides will be black. You can try the other sizes to see which works best for you.

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1 Answer

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Might be a bad CRT or bad video output IC that drives the CRT that would cause this issue.

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