Nearly there but still faulty.

LG 42px3rv-za Plasma TV

Just got this tele that was`t working. The lady told me her electric ran out and TV was OK. After she put money on her electric meter the TV would`t come back on,

Took back off and noticed 2 caps had domed , So i replaced them, c328-c601 then TV is OK.

But, the picture keeps flicking off then back on about every minute and comes back on and just keeps repeating but the power light and sound stays on whilst this is happening.

I also found out the HDMI port doesn't work and can only get picture channels when using a FreeView box with SCART connection. I don`t know if this TV is digital or analogue

The main board is MF-056A 6870VM0531E0 050525. I have tried to find a service or training manual but cannot find one.

Please help me to diagnose the problem is it the power board or main board at fault or which board will it be.

Also any way I could remedy this with cheaper option, All help is much appreciated!

Thank You