Lenovo ThinkPad 390X Hardware Maintenance Manual (November 1999): ThinkPad 390 - Page 48

LCD-Related Symptoms, Keyboard-Related Symptoms, Indicator-Related Symptoms

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Page 48 highlights

Symptom/Error No beep, power-on indicator off, LCD blank during POST No beep, power-on indicator on, LCD blank during POST No beep during POST but system runs correctly. FRU/Action in Sequence Battery AC Adapter DC-DC & BATT board System board Reseat DIMM. CPU card System board Speaker LCD-Related Symptoms Symptom/Error FRU/Action in Sequence LCD backlight not working LCD too dark LCD brightness cannot be adjusted LCD contrast cannot be adjusted 1. Reseat the LCD connector. 2. Check the LCD inverter ID 3. LCD FPC 4. LCD inverter 5. LCD 6. System board LCD screen unreadable Screen abnormal Wrong color displayed 1. Reseat the LCD connector. 2. Check the LCD inverter ID 3. LCD FPC 4. LCD inverter 5. LCD 6. System board LCD has extra horizontal or vertical lines displayed. 1. Check the LCD inverter ID 2. LCD FPC 3. LCD inverter 4. LCD 5. System board Keyboard-Related Symptoms Symptom/Error FRU/Action in Sequence Keyboard (one or more keys) doesn't work. 1. Reseat the keyboard cable. 2. Keyboard 3. System board Indicator-Related Symptoms Symptom/Error FRU/Action in Sequence Indicator incorrectly remains off or on, but system runs correctly. 1. Reseat the LED board. 2. LED board 3. System board 42 ThinkPad 390X / i 1700 HMM

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Symptom/Error
FRU/Action in Sequence
No beep, power-on
indicator off, LCD
blank during POST
±
Battery
±
AC Adapter
±
DC-DC & BATT board
±
System board
No beep, power-on
indicator on, LCD
blank during POST
±
Reseat DIMM.
±
CPU card
±
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
LCD contrast cannot
be adjusted
1.
Reseat the LCD connector.
2.
Check the LCD inverter ID
3.
LCD FPC
4.
LCD inverter
5.
LCD
6.
System board
LCD screen unread-
able
Screen abnormal
Wrong color dis-
played
1.
Reseat the LCD connector.
2.
Check the LCD inverter ID
3.
LCD FPC
4.
LCD inverter
5.
LCD
6.
System board
LCD has extra hori-
zontal or vertical lines
displayed.
1.
Check the LCD inverter ID
2.
LCD FPC
3.
LCD inverter
4.
LCD
5.
System board
Keyboard-Related Symptoms
Symptom/Error
FRU/Action in Sequence
Keyboard (one or
more keys) doesn't
work.
1.
Reseat the keyboard cable.
2.
Keyboard
3.
System board
Indicator-Related Symptoms
Symptom/Error
FRU/Action in Sequence
Indicator incorrectly
remains off or on, but
system runs cor-
rectly.
1.
Reseat the LED board.
2.
LED board
3.
System board
42
ThinkPad 390X / i 1700 HMM