IBM PCjr Hardware Maintenance And Service page 104

Press the Ins key once.
• If a television or composite display is attached to the
system unit, the image should be in black and white.
• If an RGB display is attached to the system unit, the
image should be in color.
320x200x40
DID THE CORRECT IMAGE APPEAR ON YOUR
SCREEN?
The system board is bad. Replace it.
Repeat advanced POST and the advanced
tests to ensure that the IBM PCyr is operating
correctly.
3-500-16 Display