The 312V is very marginal for the inverter circuit to work properly. Do you have capacitor meter to check the capacitance of that large cap since if the PFC not working, I expect the voltage on the cap to be at 230V (your country line voltage) x 1.414 = 325V but with very poor regulation due to failed PFC.
don't have that a meter that could read that large of a cap at this time but will be getting one soon ordered an ESR meter.
I know that I've had a similar problem before with failed PFC circuit causing intermittent operation. TV'd work in my room with 245VAC nominal, but it'd fail in a friend's house that was getting 235VAC.
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If your line voltage is at about 120V (I did not know that Trinidad uses 120V in staed of 230V), then the voltage on the cap when it is in standby mode should be about 160V. Something does not make sense here.
That means the PFC must be running (since you are getting about 320V) which still does not make sense since the PFC IC is not getting enough b+ at the VCC pin to run either.
There is a chance the PFC diode is bad, which will cause the output to sit at the input voltage. Have you checked all diodes on the HOT/Primary side for shorts?
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Let me ask u something DP805 what is the replacement for that diode because i was getting .43 on the meter can i replace it with one with the same value as DP810 and DP804 which is IN5408?
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