IBM 6151 Maintenance And Service Manual page 351

Step 5
Be sure the display signal cable is securely plugged into the
display adapter.
16-Pin Module
/conneClor
(Signal Cable)
AJZB171
IS THE DISPLAY SIGNAL CABLE SECURELY PLUGGED
INTO THE DISPLAY ADAPTER?
YES
Record
SRN
16-430-600; then go to "Step 6" on
page 3-6000-6.
NO
This completes the repair.
(6/88) Problem Isolation Charts
3-6000-5