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Symptom/Error FRU/Action in Sequence
Operating system
not found
1. Check that the operating system has no
failure and is installed correctly.
2. Enter IBM BIOS Setup Utility and see
whether the hard disk drive and the
diskette drive are properly installed.
3. Diskette drive
4. Hard disk drive
5. System board
No Beep Symptoms
Symptom/Error FRU/Action in Sequence
No beep, power-on
indicator on, LCD blank,
no POST
1. Ensure every connector is
connected tightly and correctly.
2. DIMM
3. System board
No beep, power-on
indicator off, LCD blank
during POST
1. Battery ASM
2. AC Adapter
3. System board
No beep, power-on
indicator on, LCD blank
during POST
1. Reseat DIMM.
2. System board
No beep during POST
but system runs correctly.
Speaker
LCD-Related Symptoms
Symptom/Error FRU/Action in Sequence
LCD backlight not
working
LCD too dark
LCD brightness cannot
be adjusted
1. Reseat the LCD connector.
2. LCD FPC ASM
3. LCD inverter
4. LCD
5. System board
LCD screen unreadable
Character missing pels
Screen abnormal
Wrong color displayed
1. Reseat the LCD connector.
2. LCD FPC ASM
3. LCD inverter
4. LCD
5. System board
LCD has extra horizontal
or vertical lines
displayed.
1. LCD FPC ASM
2. LCD inverter
3. LCD
4. System board
22 ThinkPad s30, s31