Lenovo ThinkPad 1838, Hardware Maintenance Manual

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Chapter 2. Important service information
This chapter presents the following important service information that applies to all machine types supported
by this manual:
•
“Strategy for replacing FRUs” on page 19
– “Important notice for replacing a system board” on page 19
• “Strategy for replacing FRUs for CTO, CMV, and GAV” on page 20
– “Product definition” on page 20
– “FRU identification for CTO, CMV, and GAV products” on page 20
Important:
• Advise customers to access http://www.lenovo.com/support to view the software fixes and driver
downloads for the tablet. To install them, advise customers to call the Lenovo
®
Customer Support Center.
Telephone numbers for Lenovo Support Center are available at:
http://www.lenovo.com/support/phone
• System disassembly and reassembly videos that show the FRU removal and replacement procedures for
the Lenovo authorized service technicians are available at:
http://www.lenovoservicetraining.com/ion/
Strategy for replacing FRUs
Before replacing parts:
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:
• If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall
the original FRU before you continue
.
• Some tablets have both a processor board and a system board. If you are instructed to replace either
the processor board or the system board, and replacing one of them does not correct the problem,
reinstall that board, and then replace the other one.
• If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error.
Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
Attention: The setup configuration on the tablet you are servicing may have been customized. Running
Automatic Configuration may alter the settings. Note the current configuration settings (using the View
Configuration option); then, when service has been completed, verify that those settings remain in effect.
Important notice for replacing a system board
Attention: When handling a system board:
• Do not drop a system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array) chipset.
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