Panasonic TC-L42D2 Technical Manual page 83

Conclusion: Exchange the Panel
Source Driver
LCD Panel (Gate Driver is in Panel)
Diagnosis
In this case , small vertical line problem is LCD panel defect.
If IC8001 Nile-TCON is defective, there would be many vertical lines all over
screen.
Picture Defect (3) (D Series)
Gate
Driver
LVDS DATA
Control DATA
TC board
LVDS DATA
A board
(LVDS= Low Voltage Differential Signaling)
Sample Picture
Abnormal line
Abnormal bar
Slide # 83