IBM 6151 Maintenance And Service Manual page 323

Step 3
Exchange the following FRUs to isolate the failure. Check each
FRU by running the Display Checkout. Be sure to install the
original FRUs in their correct positions if they are not identified
as the failing FRU.
1. Exchange the IBM PC Graphics Memory Expansion Card
(install the original modules on it).
2. Exchange the modules one at a time or in groups to identify the
failing module.
3. Exchange the IBM PC Enhanced Graphics Adapter.
If you still have a problem and the same SRN is displayed, go to
"Unresolved Problem PIC 0060" on page 3-0060-1, otherwise go to
"Problem Determination Procedure PIC 0030" on page 3-0030-1.
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8888
8888
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(6/88) Problem Isolation Charts 3-4200-3