Okay, here are my two problems:
The 42pf331 does after a while (sometimes 30mins, sometimes not at all) produce a high pitch noise, 18-20kHz region.

i was told this could be the core of a drossle vibrating. My plan is to glue em all when i open it. Suggestions?

Second issue:
The other TV usually needs 4-6 attempts to start before the backlight lights up. The sound is OK, and after reading here, I understand that it is possible that its just the backlight not working. I have not tested this with a flashlight, as the tv is on now and will only produce...