Panasonic TC-L42D2

Slide # 90
Panel Free Run Mode
When a picture problem is encountered, the internal test pattern generator
may be used to determine whether the symptom is the result of defective A board or the panel.
The test pattern is displayed as follows:
Start the Panel
Free Run
Feature
Did the test
patterns display
correctly?
Panel
A-Board
All video sources
contain distortion
No
Yes