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In 1989 Sony was having Solder problems, I had a late 1989 built XBR that the picture starting randomly blacking out after about two years of use.
This was before the Internet or I would have known it was cold solder joints on a Horizontal transformer (not sure which one but not the flyback), it took about three tries of taking the set apart and soldering on the main board before I finally fixed it.
You can't always tell by looking if a solder joint is good or not, sometimes you just have to get in there and solder a bunch of stuff until you fix it.
It will usually be on a higher current connection though.
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