IBM 6151 Maintenance And Service Manual page 344

Step 6
Be sure the display signal cable is securely plugged into the
display adapter.
16·Pin Module
/connector
(Signal Cable)
A.JZB171
IS THE DISPLAY SIGNAL CABLE SECURELY PLUGGED
INTO THE DISPLAY ADAPTER?
YES
Record SRN 16-450-590; then go to the next page.
NO This completes the repair.
3-5900-6 Service Manual