* working mostly from memory, so incorrect info may be present*
The W8 start of an iMac serial number was common across many models.
The iMac g5 (iSight) 17" clearly had an issue with vertical lines developing, even in the warranty period. I do not recall APL having an official program for it, but doesn't mean it didn't exist or that they covered some of them past the 1year.
The LCD panel on this model was APL part number 661-3789 [LG Phillips LM171W02] ( sorry don't have the (xx) (xx) at the end)
It was almost identical to the iMac 17" 2006 Intel (part# 661-3879) [LM171W02(TL)(B2)], however they were not interchangeable.
The manufacturer's LCD panel numbers were identical except the (xx)(xx) digits at the end.
Our LCD supplier at the time had a modified intel panel that worked on the iSight, but we never bought one, so I have no idea how it was modded.
Typically, when a LCD panel is bad on an iMac, most people more on to something newer.