IBM X3950 X5 Problem Determination And Service Manual page 84

v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v See Chapter 4, "Parts listing, Types 7145, 7146, 7143, and 7191," on page 81 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Light path
diagnostics LED Description
DASD A hard disk drive has failed or has
been removed.
Note: The error LED on the failing
hard disk drive is also lit.
RAID Reserved
BOARD The I/O-board shuttle or
microprocessor board has failed.
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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
Action
1. Reinstall the removed drive.
2. Reseat the following components:
a. Suspected hard disk drive (see "Removing a
hot-swap hard disk drive" on page 117 and
"Replacing a hot-swap hard disk drive" on
page 118)
b. SAS hard disk drive backplane (see "Removing
the SAS hard disk drive backplane assembly"
on page 153 and "Replacing the SAS hard disk
drive backplane assembly" on page 155)
c. SAS signal cable
d. The I/O board assembly (see "Removing the
I/O-board shuttle" on page 143 and "Replacing
the I/O-board shuttle" on page 144)
3. Replace the components listed in step 2, one at a
time, in the order shown, restarting the server each
time.
1. Find the suspected board by checking the LEDs on
the I/O-board shuttle and microprocessor board.
2. If the I/O board LED is lit, reseat the I/O board
(see "Removing the I/O-board shuttle" on page
143 and "Replacing the I/O-board shuttle" on page
144). If the I/O board LED remains lit, replace the
I/O board.
3. If the I/O board LED is not lit, remove memory
card 7 to see if the microprocessor-board LED is lit
(see "Removing a memory card" on page 136).
4. (Trained service technician only) If the
microprocessor-board LED is lit, reseat the
microprocessor board (see "Removing the
microprocessor-board assembly" on page 171 and
"Replacing the microprocessor-board assembly" on
page 173). If the microprocessor-board LED
remains lit, replace the microprocessor board.