The HP 42" plasma TV went black but you could still hear sound. I called HP Technical folks and was informed that they found bad y sustain boards and depending on the serial number it would be replaced. When I gave them my serial number they said it was not on the list. Then they informed me for $629.00 they would take 3 attempts to fix the TV and if they couldn't, they would return $300.00. The Technical person assured me it was the y sustain board.

HP is ignoring this problem and not notifiying people who bought the
TV's that the y sustain board breaks only after 2 years or so.

http://www.HPplasmaLAWSUIT.info