Lenovo ThinkPad 390E Hardware Maintenance Manual (March 1999): ThinkPad 390E o - Page 54

LCD-Related Symptoms, Indicator-Related Symptoms, DC/DC & Charger board ASM

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Symptom/Error No beep during POST but system runs correctly. FRU/Action in Sequence 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 ASM 4. LCD inverter 5. LCD 6. System board LCD screen unreadable Character missing pels Screen abnormal Wrong color displayed 1. Reseat the LCD connector. 2. Check the LCD inverter ID 3. LCD FPC ASM 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 ASM 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 Power-Related Symptoms Symptom/Error Power shuts down during operation. FRU/Action in Sequence 1. Battery 2. AC Adapter 3. DC/DC & Charger board ASM 4. System board 44 ThinkPad 390E

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Symptom/Error
FRU/Action in Sequence
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 ASM
4.
LCD inverter
5.
LCD
6.
System board
LCD screen unread-
able
Character missing
pels
Screen abnormal
Wrong color dis-
played
1.
Reseat the LCD connector.
2.
Check the LCD inverter ID
3.
LCD FPC ASM
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 ASM
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
Power-Related Symptoms
Symptom/Error
FRU/Action in Sequence
Power shuts down
during operation.
1.
Battery
2.
AC Adapter
3.
DC/DC & Charger board ASM
4.
System board
44
ThinkPad 390E