Problem Determination Tips - Lenovo ThinkCentre A52 Hardware Maintenance Manual
Hardware maintenance manual
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Green
Power LED
diagnostic LED
ON
ON
OFF
OFF
OFF (after the
ON
power button
has been
pressed)
ON
ON
8. Run the Diagnostic programs. See Chapter 5, "Diagnostics using PC-Doctor for
Problem determination tips
Due to the variety of hardware and software combinations that can be
encountered, use the following information to assist you in problem determination.
If possible, have this information available when requesting assistance from Service
Support and Engineering functions.
v Machine type and model
v Processor or hard disk upgrades
v Failure symptom
v Diagnostics version
v Hardware configuration
v Operating system software
Note: To eliminate confusion, identical systems are considered identical only if
44
Hardware Maintenance Manual
d. Observe the LEDs and refer to the following table.
Yellow
diagnostic LED Action
OFF
OFF
OFF
ON
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.
DOS," on page 47.
v If you receive an error, replace the part that the diagnostic program calls out
or go to "Diagnostic error codes" on page 59.
v If the test stops and you cannot continue, replace the last device tested.
– Do diagnostics indicate a failure?
– What, when, where, single, or multiple systems?
– Is the failure repeatable?
– Has this configuration ever worked?
– If it has been working, what changes were made prior to it failing?
– Is this the original reported failure?
– Type and version level
– Print (print screen) configuration currently in use
– BIOS level
– Type and version level
they:
This is the normal condition of the LEDs when the power is
OK.
Make sure the power cord is attached to a working electrical
outlet.
If the electrical outlet is OK, replace the power supply.
Replace the system board
Replace the power supply
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