Lenovo ThinkCentre A52 Hardware Maintenance Manual - Page 64

Power, Green, diagnostic, Yellow, Action

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Power LED ON OFF OFF (after the power button has been pressed) ON 1. Turn off the computer and disconnect all external devices. 2. Power-on the computer. 3. There are three LEDs to help you determine if the power supply and system board are working correctly. The power button LED is located on the front of the computer and the two diagnostic LEDs are located on the power supply at the rear of the computer. After pressing the power button, observe the LEDs and refer to the following table: Green diagnostic LED ON OFF ON Yellow diagnostic LED Action OFF This is the normal condition of the LEDs when the power is OK. OFF v Make sure the power cord is attached to a working electrical outlet. v Check the power cord for continuity. v If the problem persists, replace the power supply. OFF Replace the system board ON ON Replace the power supply If the Diagnostic LEDs are in the normal condition and the problem persists, replace the system board and the microprocessor, one at a time, until the computer works correctly. 58 Hardware Maintenance Manual

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1.
Turn
off
the
computer
and
disconnect
all
external
devices.
2.
Power-on
the
computer.
3.
There
are
three
LEDs
to
help
you
determine
if
the
power
supply
and
system
board
are
working
correctly.
The
power
button
LED
is
located
on
the
front
of
the
computer
and
the
two
diagnostic
LEDs
are
located
on
the
power
supply
at
the
rear
of
the
computer.
After
pressing
the
power
button,
observe
the
LEDs
and
refer
to
the
following
table:
Power
LED
Green
diagnostic
LED
Yellow
diagnostic
LED
Action
ON
ON
OFF
This
is
the
normal
condition
of
the
LEDs
when
the
power
is
OK.
OFF
OFF
OFF
v
Make
sure
the
power
cord
is
attached
to
a
working
electrical
outlet.
v
Check
the
power
cord
for
continuity.
v
If
the
problem
persists,
replace
the
power
supply.
OFF
(after
the
power
button
has
been
pressed)
ON
OFF
Replace
the
system
board
ON
ON
ON
Replace
the
power
supply
If
the
Diagnostic
LEDs
are
in
the
normal
condition
and
the
problem
persists,
replace
the
system
board
and
the
microprocessor,
one
at
a
time,
until
the
computer
works
correctly.
58
Hardware
Maintenance
Manual