IBM 6150 Hardware Maintenance Manual page 257

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
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.
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Contrast Control
Power On and Brightness Control
IS THE 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