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General Checkout
Use the following procedure as a guide for computer
problems.
Note: The diagnostic tests are intended to test only IBM
products. Non-IBM products, prototype cards or modified
options can give false errors and invalid system responses.
1. Obtain the failing symptoms in as much detail as
possible.
2. Verify the symptoms by attempting to recreate the
failure by running the diagnostic test or by repeating
the same operation.
Note: To run the diagnostics, refer to “How to Run
the Diagnostics” on page 421.
3. Use the following table with the verified symptom to
determine which page to go to. Search the
symptoms column and find the description that best
matches your symptom; then go to the page shown in
the “Go to” column.
Symptom Go to
Power failure. (The power
indicator does not go on or
stay on.)
“Power Systems Checkout”
on page 398.
POST does not complete.
No beeps or error codes are
indicated.
“Symptom-to-FRU Index” on
page 408, and then use the
No Beep Symptoms table.
POST beeps, but no error
codes are displayed.
“Symptom-to-FRU Index” on
page 408, and then use the
Beep Symptoms table.
POST detected an error and
displayed numeric error
codes.
“Symptom-to-FRU Index” on
page 408, and then use the
Numeric Error Codes table.
The diagnostic test detected
an error and displayed an
FRU code.
“FRU Codes” on page 411.
The configuration is not the
same as the installed
devices.
“Checking the Installed
Devices List” on page 422.
Other symptoms (such as
LCD display problems).
“Symptom-to-FRU Index” on
page 408, and then use the
other symptoms table.
Symptoms cannot be
recreated (intermittent
problems).
Use the customer reported
symptoms and go to
“Symptom-to-FRU Index” on
page 408.
Memory Checkout
One of two types of memory cards can be used, IC DRAM
card or DIMM card. See the following table for the total
memory size available when they are installed.
ThinkPad 755CE, 755CSE, 755CV, 755CX (9545)
393