Thanks guys . I did look for coolant leaks and none had it but i have
seen it in the past and junked those sets for parts .

The models are Samsung HCM 4215W and AKAI PT4298HDX/SMS
Both models have P55A chassis .

I like the idea of buying 2 or 4 chips and try the circuit in all . I
did save a couple by using chips from leaker sets .
I was concerned a bigger problem caused these chips to fail in so many
sets .