Question about Sony Televison & Video
There are two main resons for this type of trouble with Sony. The first one is as you said, video card IC overheating. The second one is most common, and should be noted. There is a suupply voltage goes to video output card, usually about 270VDC, whcih cupplies ot video output section, and in turn drive the cathodes of the tube. If this voltage track has some trouble, that is, any loose soldering with any lead connections of the serial resistors, will cause very low voltages athe chatodes of tubes. From your post, I assumes this and might be. Check for any loose solderings in the video output cards.
Normally, loose soderings are hard to detect, as they will be microscopic. The easiest way is to resolder most of the suspected pointw by applying a little more solder, without shorting the adjecent solder points. do this first. Surely this process will solve your problem. OK.
Posted on Mar 14, 2011
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Posted on Jan 02, 2017
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