020 (continued)
– Remove one bank of four SIMM cards.
– Power on the system unit.
DOES THE DISPLAY SELF TEST PATTERN APPEAR?
Yes No
021
Replace the SIMM cards.
022
(From step 019)
IS YOUR SYSTEM BOARD A 486SX WITH 30-PIN MEMORY SIMMS, AND
DOES IT HAVE A VIDEO RAM IN SOCKET LOCATIONS U31, U35, U36,
AND U37 (FOR LEVEL 1) OR U29, U30, U31, AND U32 (FOR LEVEL 2)?
See the “System Board Layouts” on pages 5-2 through 5-13.
Yes No
023
Go to Step 026.
024
– Power off the system unit.
– Remove the socketed video RAM from the system board.
– Power on the system unit.
DOES THE DISPLAY SELF TEST PATTERN APPEAR?
Yes No
025
Replace the video RAM.
026
(From steps 008, 012, 017, and 023)
Unplug the display system I/O signal cable from the system unit.
(Step 026 continues)
Diagnostic Information 2-101
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