GE PANDA Service Manual page 69

Chapter 4: Troubleshooting
Service Mode
4.1.7.2 VGA Diagnostics
This menu provides one selectable multi color test pattern and six selectable black and white test patterns.
The color test pattern should not have drop out or incorrectly displayed colors.
The 6 gray scale test patterns display alternate pixels turned on and off, then off and on, in horizontal,
vertical, and diagonal patterns. Failed pixels will appear as dark spots (drop out).
Service Manual 4-7