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He is right. While a lot of these sets can be fixed with those 2 chips, SOME develop OTHER problems on that deflection board that are often VERY hard to pin down!! IIRC, there was one or 2 problems that would occur and it would kill a LOT of small parts all OVER that board-including some SMD devices below the board. Flybacks also sometimes fail--and not always alone. I have also seen a few diodes short in the power supply. I do recall working on a few of these board and NOT being able to fix them....just WAY too many problems !! If you have a good DA4 or so deflection board---either keep it or SELL it as such--do NOT toss it !!
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