Panasonic TC-L42D2 Technical Manual page 85

Conclusion: Exchange the Panel
Source Driver
LCD Panel (Gate Driver is in Panel)
Diagnosis
In this case, the screen color uniformity is abnormal.
The LCD panel is transformed by stress.
For example: mounting screw or physical damage.
So, for such a symptom, we have to exchange LCD panel.
Picture Defect (5) (D Series)
Gate
Driver
LVDS DATA
Control DATA
TC board
LVDS DATA
A board
(LVDS= Low Voltage Differential Signaling)
Sample Picture
Abnormal area
Abnormal area
Slide # 85