IBM 6151 Maintenance And Service Manual page 340

Step 2
1. Set the power switch on the system unit to Off.
2. If attached, set the power switch on the RT PC 6192 to Off.
3. Turn the Power On and Brightness Control fully clockwise.
4. Wait about 1 minute.
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IS THE SCREEN COMPLETELY LIGHTED EXCEPT FOR
THE BORDER?
NO Record SRN 26-590; then go to "Step 7" on page 3-5900-7.
YES Continue on the next page.
3-5900-2 Service Manual