IBM 6151 Maintenance And Service Manual page 364

Step 2
1.
Set the power switch on the system unit to Off.
2. Turn the Power On and Brightness Control fully clockwise.
3. Wait about 1 minute.
(j)
~
=
Contrast Control
Power On and Brlghtn••• Control
AJZB20B
IS THE DISPLAY SCREEN COMPLETELY LIGHTED
EXCEPT FOR THE BORDER?
NO Record SRN 26-620; then go to "Step 7" on page 3-6200-7.
YES
Continue on the next page.
3-6200-2 Service Manual