IBM 4851 514 Service Guide - Page 65

Troubleshooting, common, problems

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Updated October, 2008 Chapter 4. Troubleshooting common problems This section describes several common problems and explains what to do. Table 9. Symptoms and actions If the problem is... Here's what to do. No green power light on the tower unit. 1. Ensure that the system unit is plugged into a working electrical outlet and replug the power cable at the power supply. 2. Verify that the display cable is plugged properly into the display and into the system board. 3. Verify the power cable is plugged into the system board connectors P1 and P2. 4. Replace the power supply. See "Power supply - removing and replacing" on page 68. 5. Replace the system board. See "System board - removing and replacing" on page 66. Operator display exhibits the following conditions (with the green LED on): v Blank screen v No cursor available v Screen is unreadable v Other display problems 1. Adjust the brightness control at the bottom right side of the display. 2. Ensure that the operator display cable is securely connected. 3. Switch unit off and back on. 4. Run the operator display test using the diagnostic USB memory key. 5. Open the tablet and check that all of the cable connections are secure. 6. Replace the LCD assembly. See "LCD assembly removal and replacement" on page 59. 7. If condition persists, replace the tablet card. See "Control card - removal and replacement" on page 57. 8. If condition persists, replace the system board. See "System board - removing and replacing" on page 66. Operator display backlight: dark, dim, or partially lit. 1. Adjust the brightness using the button located on the front of the display. 2. Ensure operator display cable is securely attached under display tablet and at system board. 3. Open the tablet and check that all of the cable connections are secure. Reboot the system. 4. If only half of the display is lit, replace the LCD assembly. See "LCD assembly - removal and replacement" on page 59. 5. If condition persists, replace the system board. See "System board - removing and replacing" on page 66. 6. If condition persists (the operator display backlight is dark dim or partially lit); however, the HDD light shows activity; and the POST bleeps completion upon reboot, replace the LCD assembly. See "LCD assembly - removal and replacement" on page 59. © Copyright IBM Corp. 2005, 2008 49

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Chapter
4.
Troubleshooting
common
problems
This
section
describes
several
common
problems
and
explains
what
to
do.
Table
9.
Symptoms
and
actions
If
the
problem
is...
Here’s
what
to
do.
No
green
power
light
on
the
tower
unit.
1.
Ensure
that
the
system
unit
is
plugged
into
a
working
electrical
outlet
and
replug
the
power
cable
at
the
power
supply.
2.
Verify
that
the
display
cable
is
plugged
properly
into
the
display
and
into
the
system
board.
3.
Verify
the
power
cable
is
plugged
into
the
system
board
connectors
P1
and
P2.
4.
Replace
the
power
supply.
See
“Power
supply
–
removing
and
replacing”
on
page
68.
5.
Replace
the
system
board.
See
“System
board
–
removing
and
replacing”
on
page
66.
Operator
display
exhibits
the
following
conditions
(with
the
green
LED
on):
v
Blank
screen
v
No
cursor
available
v
Screen
is
unreadable
v
Other
display
problems
1.
Adjust
the
brightness
control
at
the
bottom
right
side
of
the
display.
2.
Ensure
that
the
operator
display
cable
is
securely
connected.
3.
Switch
unit
off
and
back
on.
4.
Run
the
operator
display
test
using
the
diagnostic
USB
memory
key.
5.
Open
the
tablet
and
check
that
all
of
the
cable
connections
are
secure.
6.
Replace
the
LCD
assembly.
See
“LCD
assembly
-
removal
and
replacement”
on
page
59.
7.
If
condition
persists,
replace
the
tablet
card.
See
“Control
card
-
removal
and
replacement”
on
page
57.
8.
If
condition
persists,
replace
the
system
board.
See
“System
board
–
removing
and
replacing”
on
page
66.
Operator
display
backlight:
dark,
dim,
or
partially
lit.
1.
Adjust
the
brightness
using
the
button
located
on
the
front
of
the
display.
2.
Ensure
operator
display
cable
is
securely
attached
under
display
tablet
and
at
system
board.
3.
Open
the
tablet
and
check
that
all
of
the
cable
connections
are
secure.
Reboot
the
system.
4.
If
only
half
of
the
display
is
lit,
replace
the
LCD
assembly.
See
“LCD
assembly
-
removal
and
replacement”
on
page
59.
5.
If
condition
persists,
replace
the
system
board.
See
“System
board
–
removing
and
replacing”
on
page
66.
6.
If
condition
persists
(the
operator
display
backlight
is
dark
dim
or
partially
lit);
however,
the
HDD
light
shows
activity;
and
the
POST
bleeps
completion
upon
reboot,
replace
the
LCD
assembly.
See
“LCD
assembly
-
removal
and
replacement”
on
page
59.
Updated
October,
2008
©
Copyright
IBM
Corp.
2005,
2008
49