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After about 30 min of tv playing, the screen begins getting blurry and discolored. when I turn it off for about 20 min. it will be fine again for about another 30 minutes. Sony trinitron wega Dec. 2001 model

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Not enough info, but I'll take a stab. What you are describing is known in our trade as a thermal, since it is related to the warm-up of your unit.

If your set is a triple gun CRT unit, the convergence ICs have probably come unsoldered and are making intermittent connections in there depending on the heat of warm-up. Those ICs generate a tremendous amount of heat and in CRT tech it is not unusual for their legs to come unsoldered, after years of expansion and contraction of the solder joints themselves.

Getting them resoldered again before the ICs go bad will get you out of the woods and back on track with completely reliable performance from then on, but until that happens you must not allow your set to stay running for any length of time in its bad condition. Doing so will croak your ICs and you will have to take the further step of getting them replaced and having your convergence retightened and possibly your geometry redone as well.


Mr Bob
www.imageperfection.com
510-278-4247

Posted on Dec 06, 2008

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