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8.2 LCD No Display Or Display Abnormal
Symptom:
The LCD shows nothing or abnormal picture.
LCD Display Abnormal
LCD Display Abnormal
1.
1.
Push reset button and turn on the
Push reset button and turn on the
system power again.
system power again.
2. Remove All External IO device.
2. Remove All External IO device.
( EX: SD Memory Card.)
( EX: SD Memory Card.)
3. Check the LCD Panel Connector is
3. Check the LCD Panel Connector is
connected Property.
connected Property.
Yes
Display
Display
Ok?
Ok?
No
Try another known good LCD
Try another known good LCD
module.
module.
Yes
Yes
Display
Display
Ok?
Ok?
No
No
Barracuda PDA Maintenance
Board
Board
Troubleshooting
Troubleshooting
End
Replace
Replace
Motherboard
Motherboard
Replace faulty parts and
Replace faulty parts and
test after each replacement
test after each replacement
1. LCD Panel.
2. External IO Device.
3. Memory Board.
-
level
-
level
One of the following parts or signals on the motherboard may be
One of the following parts or signals on the motherboard may be
Defective, use an oscilloscope to check the signals or replace t
Defective, use an oscilloscope to check the signals or replace t
Parts one at a time and test after each replacement.
Parts one at a time and test after each replacement.
Parts:
Parts:
RP5
RP3
RP6
RP4
R252
R68
R230
R69
R74
R70
R78
R71
R82
R73
R83
R75
R84
R76
R199
R77
Check
Yes
Yes
J6,U18,U3 for cold
solder ?
No
No
Signals:
Signals:
LCD_R[0:5]
VCC_LCD
R79
LCD_G[0:5]
HCK
R80
R81
LCD_B[0:5]
HSP
LCD_MCK
STB
L6
LCD_OE
INV
L7
LCD_ON
AP
R66
RO[0:5]
POL
R67
VR1
GO[0:5]
VCK
BO[0:5]
VDE
VSP
Re
Re
-
-
soldering
soldering
he
he
COM
VCOM
VCC_5V
VCC_+15
VCC_-15
126
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