IBM 5150 Hardware Maintenance Manual page 104

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You may have a LED that has failed. If the diagnostic routines
run correctly but the LED is not lit, check for a minimum of
1.5 V dc between P9-l and P9-2 on the Logic Printed Circuit
Board when the spindle is turning.
DO YOU HAVE FUNCTIONING DIAGNOSTICS, AT LEAST
1.5 Vdc AT P9 AND A LED THAT DOES NOT LIGHT?
YES
Replace the LED assembly. See Section 3,
"Removal/Replacement. "
NO
600-9

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