Question about Sony FD Trinitron WEGA KV-32HS510 32" TV

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Swelling Picture After being on for approximately an hour, the picture starts to swell or expand. If we put a fan on it, it goes back to a normal picture, but we have to keep a fan on it.

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This effect will happen if the CRT (cathode ray tube) final voltage is dropping from its normal voltage, which is 25KV or may be more for a very large tube. Either the Power supply cannot supply enough power, or the tube is taking more current than it is designed to do. Too much brightness will cause this, so try reducing the Brightness and Contrast. There may be Gamma and Saturation as well to adjust. Try setting to a default position for these parameters. If the swelling effect is still present, the tube may be taking excessive current due to being `soft' ie: gassy or contain some air. Make sure the TV is clear of dust inside as this will create extra heating. Make sure you have the correct mains voltage setting. If this problem persists the line timebase will eventually fail. If you unplug the TV, remove the back, look for components of the line timebase. Make sure the line output transistor is properly fixed, so that it is being cooled by its heat sink. If you are not familiar with what to look for you must find a service engineer.

Posted on Oct 23, 2006


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