samsung ps42c7hd clicking.

[mzone]

hi, i have a samsung ps42c7hd plasma with a fault which shows itself as the set not powering up and a relay clicking in the psu every 2-3 seconds.

clicking will stop if i disconnect control board however i replaced control board but same problem.

i have also noticed with no boards attached to power supply theres va voltage but no vs voltage upon switch on.

any ideas?