Lenovo ThinkCentre A50 Hardware Maintenance Manual - Page 103

Removing, replacing, system, board

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7. Install the new power supply and insert the four screws that hold the power supply in place. 8. Replace the PCI riser. See "Removing and replacing a PCI adapter" on page 93. 9. Reconnect all power supply cables to the system board and the drives. See "Identifying parts on the system board" on page 92. Make sure the cables are correctly routed and are retained by the cable clips. 10. Go to "Completing the FRU replacement." on page 104. Removing and replacing the system board 1. Open the cover. See "Opening the cover" on page 90. 2. Remove the PCI riser. See "Removing and replacing a PCI adapter" on page 93. 3. Disconnect rear fan cable and remove the rear fan bracket assembly by lifting it off the system board. 4. Carefully take note of the location of all cable connections on the system board and disconnect all cables. 5. Take note of the location of the memory modules and remove them from the failing system board. See "Identifying parts on the system board" on page 92. 6. Loosen the two captured screws that secure the heat sink clamps 2 . Pivot the clamps to the side to allow the heat sink 1 to be removed. Chapter 8. Replacing FRUs 97

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7.
Install
the
new
power
supply
and
insert
the
four
screws
that
hold
the
power
supply
in
place.
8.
Replace
the
PCI
riser.
See
“Removing
and
replacing
a
PCI
adapter”
on
page
93.
9.
Reconnect
all
power
supply
cables
to
the
system
board
and
the
drives.
See
“Identifying
parts
on
the
system
board”
on
page
92.
Make
sure
the
cables
are
correctly
routed
and
are
retained
by
the
cable
clips.
10.
Go
to
“Completing
the
FRU
replacement.”
on
page
104.
Removing
and
replacing
the
system
board
1.
Open
the
cover.
See
“Opening
the
cover”
on
page
90.
2.
Remove
the
PCI
riser.
See
“Removing
and
replacing
a
PCI
adapter”
on
page
93.
3.
Disconnect
rear
fan
cable
and
remove
the
rear
fan
bracket
assembly
by
lifting
it
off
the
system
board.
4.
Carefully
take
note
of
the
location
of
all
cable
connections
on
the
system
board
and
disconnect
all
cables.
5.
Take
note
of
the
location
of
the
memory
modules
and
remove
them
from
the
failing
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
92.
6.
Loosen
the
two
captured
screws
that
secure
the
heat
sink
clamps
±2²
.
Pivot
the
clamps
to
the
side
to
allow
the
heat
sink
±1²
to
be
removed.
Chapter
8.
Replacing
FRUs
97