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Input voltage slightly above stand-off level can be well tolerated, problem is enduring overvoltage above Vbr that causes overheating of the TVS diode. TVS is good to absorb µs or even ms surge voltage but can't protect against too high DC level. Reverse voltage should be safely suppressed by the series diodes.According datasheet, the stand off voltage of the TVS diode is 38.1V. You should never go beyond to this value at normal operating conditions.
You didn't tell yet about the primary power source, what is it?
Hello dsanthosh67,
You could try inserting a 4.7 ohm 5 Watt resistor between the power IN and C254 to be used
as a surge limiter, as was used in a lot of earlier CRT televisions.
Regards,
Relayer