Samsung PS43D450A1W - Dead

[pic_whiz]

Hi,

Having messed about replacing the numerous IGBT's on both Y-Main (2 repair kits) and X-Main IGBT's which constantly blow, I decided to buy replacement secondhand boards to replace both Y and X Main. I saw the screen come up for a second or so in various colours and sparkles before pop, all four IGBT's on the replacement X-Main have blown.

Could the panel be a fault? Is there a way to test it?

PSU has been bench tested with dummy load across Vs.
Vs=213v and Va=57v, all other rails are also there, 15v, 5v etc.

Y-Main buffers tested with no s/c.

Any help appreciated.

Thanks.

[pic_whiz]

Re: Samsung PS43E450A1W - Dead

Added photo.

I power down the set immediately after this screen appears on the plasma to prevent another X-Main blow up.

Any advice?

Thanks.