Samsung PS50Q96HD

[yellowpinky]

Hello group,
When switched on the led flashes then the relay clicks.
No sound or picture.
I disconnected the upper buffer board (LJ92-01491A)(LJ41-05121A)
and the bottom half lit up (low brightness)but no picture.
Sound is ok, so must be tuned in.
I removed the Y-Sus board (LJ92-01490A)(LJ41-05120A)
and found C5715,C5709,C5300 680uf 25v domed.
These were replaced but no improvement.
I have checked the FET's are ok and checked for dry joints.
Any help would be good.
Many thanks Ian Harrison.