IBM 6151 Maintenance And Service Manual page 201

Step 23
The following FRUs are the most likely to cause display failures.
Exchange the FRUs that have not been exchanged in the following
order. Test each FRU by running System Checkout. If you
identify a failing FRU, use the removal and replacement
procedures in the section that applies to the FRU and exchange it;
then go to "Step 28" on page 3-0060-30. If you cannot identify a
failing FRU, contact your service support person.
Exchange the following FRUs in the order listed:
1.
The display
2. The display adapter
3. The system board
4. The processor board
5. If installed, the memory expansion option in slot C
6. An adapter for the fixed-disk and diskette drive
7. The power supply.
(6(88) Problem Isolation Charts 3-0060-25