Question about Sony KV-27S35 27" TV
Sony designed many of their sets with auto kine bias shutdown circuits its techno babble for a circuit that protects the tube from being burned if not setup right that particular chassis has achieved enuf hours on the crt to give you led blinks and no raster if you find that turning down the screen control on the flyback restores raster then the tube is going weak ala the previous poster blasting the tube is an art that requires color balancing without taking too much remaining gain off of the anodes in the tube neck if thats too complicated buy a new one
Posted on Dec 09, 2006
If this set is more than 5 years old, I would suspect a weak picture tube to be the cause of the symptoms you're experiencing. Sony uses a Cathode current monitoring circuit in their TV's to keep the CRT from displaying a poor quality picture, so if the current is not up to snuff, it kills the video to the tube keeping it off. Another cause could be a bad solder connection, but you would probably be able to make the picture go off and on by slapping the set if that was the problem. If it is the picture tube (CRT) that is the cause of the problem, it may be able to be restored by a CRT tester/rejuvinator (over a thousand dollars to buy new if you don't own one) or by slightly adjusting the screen control that should be located on the CRT drive board. As there is about 300 Volts DC near that control, you may want to take the set to a shop for a safer repair. Either repair is only a temporary fix. It may last another year, and by then you'll be ready for a HDTV set.
Posted on Dec 09, 2006
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Posted on Jan 02, 2017
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