Sorry about the bold type, as I'm pasting this info. Sky.

Has anyone seen this? And can you cover the DVI module to

"prevent" this from happening?

JVC AV48WP30 Important Servicing Note

If You Remove The Rear Cover While The Power Is On You Will Destroy All Dvi
Programming Inside The Dvi Digital Input Module. The Only Way To Restore The
Programming Is To Send The Unit To Jvc. There Is A Light Sensor Inside The
TV And When The Back Is Removed With The Power On The Data Is Erased From
The EPROM. First Turn Off Set And Remove Power Cord Then Short Pins 1 And 2
On The Sb Connector Of Digital Input Module. Module has to be sent to Japan
by JVC, & the repairshop pays for it.

http://www.iwaynet.net/~nesda/Jan04/Jan0413.html