Ive seen this happen all too commonly, mainly in the 5300c series. there is a small microfuse on the display panel, replace it. If it pops again, you have a shorted buffer or DC-DC converter in the panel that provides the scan voltage.
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, Lombard, 160, 165, 180, Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, 5260/100 x2, SE, SE/30, 512k, plus, LCIII, 7100, iMac G5 iSight, 6400/225