Lenovo ThinkPad i Series 172x ThinkPad 390 / i Series 1720 models Hardware Mai - Page 45

No Beep Symptoms, LCD-Related Symptoms

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Symptom/Error Operating system not found FRU/Action in Sequence 1. Enter BIOS Setup Utility and see if the hard disk drive and diskette drive A: are properly identified. 2. Diskette drive (FDD ASM) 3. Hard disk drive 4. Planar board No Beep Symptoms Symptom/Error FRU/Action in Sequence No beep, power-on indicator on, LCD blank, no POST Ensure every connector is properly seated. DIMM Reseat CPU card. CPU card Planar board No beep, power-on indicator off, LCD blank during POST Battery ASM AC Adapter DC-DC & BATT board ASM Planar board No beep, power-on indicator on, LCD blank during POST Reseat DIMM. CPU card Planar 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 ASM 4. LCD inverter 5. LCD 6. Planar 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. Planar 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. Planar board ThinkPad 390/i Series 1700 37

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Symptom/Error
FRU/Action in Sequence
Operating
system not
found
1.
Enter BIOS Setup Utility and see if
the hard disk drive and diskette drive
A: are properly identified.
2.
Diskette drive (FDD ASM)
3.
Hard disk drive
4.
Planar board
No Beep Symptoms
Symptom/Error
FRU/Action in Sequence
No beep, power-on
indicator on, LCD
blank, no POST
±
Ensure every connector is
properly seated.
±
DIMM
±
Reseat CPU card.
±
CPU card
±
Planar board
No beep, power-on
indicator off, LCD
blank during POST
±
Battery ASM
±
AC Adapter
±
DC-DC & BATT board ASM
±
Planar board
No beep, power-on
indicator on, LCD
blank during POST
±
Reseat DIMM.
±
CPU card
±
Planar 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 ASM
4.
LCD inverter
5.
LCD
6.
Planar 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.
Planar 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.
Planar board
ThinkPad 390/i Series 1700
37