IBM Personal Computer XT Manual To Operations page 183

6
Does the black area appear across the top and
bottom of the screen?
•
•
(t
YES - Go to the next step.
NO - Have the display serviced.
7
Are the black areas approximately the same
size?
•
•
(t
YES - Go to the next step.
NO - Have the display serviced.
April 1984 Test 9000-3