Plasma PDP42v7 screen (picture) turns red

[moyalt]

I hope, and be thankfull if you can reply.

My problem regards my Haier 42" plasma - the panel and also the Y-sus, Z-sus...are LG PDP42V7. the screen turn to red from time to time, sometimes it's stays for a while, in other cases it's blinking red. it happens in all the inputs, if their is a picture you will see many red dots, but actually the all screen turns red (see it when no siganl).
Is it a prblen in one of the cards?
Tested all voltages, seems O.K...

Thanks in advance.

Tom.