Samsung pn50a450p1d Y board issue

[topfli8979]

Have a samsung pn50a450p1d 50 plasma. Powers on then cycles and shuts down repeatedly. Unhooked y board, powers up fine. Anyone fixed or diagnosed one the of these? Y board #lj41-05380. No bulged caps, fuse if fine.

[tom66]

Re: Samsung pn50a450p1d Y board issue

Pictures! Pictures please?

[topfli8979]

Re: Samsung pn50a450p1d Y board issue

here is y board.

[tom66]

Re: Samsung pn50a450p1d Y board issue

Out of focus and too brightly lit. But it appears to use a combined buffer. Some FETs on the third heatsink down blow.

[topfli8979]

Re: Samsung pn50a450p1d Y board issue

Sorry for picture quality, I know its horrible. Have yet to invest in a camera that can take detailed photo. I have a surplus of boards out of broken tv's, might be a dumb question, but if its the same size and configuration. Why could I not use fet's off another board even though they are not that part number.

[tom66]

Re: Samsung pn50a450p1d Y board issue

Because you can't use different parts when the circuit is designed for specific types, not all MOSFETs and IGBTs are compatible with each other.