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What Zenith26kc20 said is 100% correct. The ICs are going intermittent, it might work for a while but replacing them should fix it for good (and do use sockets as he suggested to).
I helped my friend calibrate a few Sony 34-inch widescreen TVs recently. I was surprised how much the purity and convergence were off, but it was possible to dial them in and improve the picture a lot.
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