IBM 6150 Hardware Maintenance Manual page 229

TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
Step 4
Turn the Brightness Control fully counter-clockwise.
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IS THE SCREEN DARK?
Power-On
Indicator
Power Switch
Contrast
Control
Brightness
Control
NO Record SRN 26-580, then go to "Step 7" on page 3-5800-7.
YES Continue on the next page.
3-5800-4 Service Manual