Barracuda PDA Maintenance
126
8.2 LCD No Display Or Display Abnormal
Symptom:
The LCD shows nothing or abnormal picture.
LCD Display Abnormal
LCD Display Abnormal
Check
J6,U18,U3 for cold
solder ?
Board
Board
-
-
level
level
Troubleshooting
Troubleshooting
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
Re
Re
-
-
soldering
soldering
Yes
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
he
he
Parts one at a time and test after each replacement.
Parts one at a time and test after each replacement.
Parts:
Parts:
Signals:
Signals:
LCD_R[0:5]
LCD_G[0:5]
LCD_B[0:5]
LCD_MCK
LCD_OE
LCD_ON
RO[0:5]
GO[0:5]
BO[0:5]
RP5
RP6
R252
R230
R74
R78
R82
R83
R84
R199
VCC_LCD
HCK
HSP
STB
INV
AP
POL
VCK
VDE
VSP
COM
VCOM
VCC_5V
VCC_+15
VCC_-15
RP3
RP4
R68
R69
R70
R71
R73
R75
R76
R77
R79
R80
R81
L6
L7
R66
R67
VR1
No
No
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.
Replace
Replace
Motherboard
Motherboard
Try another known good LCD
Try another known good LCD
module.
module.
Display
Display
Ok?
Ok?
Yes
Yes
No
No
Display
Display
Ok?
Ok?
End
Yes
No
Содержание Barracuda
Страница 5: ...Barracuda PDA Maintenance 4 Block Diagram ...
Страница 6: ...Barracuda PDA Maintenance 5 Power Block Diagram ...
Страница 18: ...Barracuda PDA Maintenance 17 Typical Audio Amplifier Application Circuit ...
Страница 24: ...Barracuda PDA Maintenance 23 Block diagram of the 10 bit ADC circuit ...
Страница 26: ...Barracuda PDA Maintenance 25 BLOCK DIAGRAM ...
Страница 28: ...Barracuda PDA Maintenance 27 Block Diagram ...
Страница 30: ...Barracuda PDA Maintenance 29 GENERAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ...
Страница 33: ...Barracuda PDA Maintenance 32 ...
Страница 42: ...Barracuda PDA Maintenance 41 ...
Страница 43: ...Barracuda PDA Maintenance 42 ...
Страница 45: ...Barracuda PDA Maintenance 44 FUNCTIONAL BLOCK DIAGRAM ...
Страница 46: ...Barracuda PDA Maintenance 45 1 3 1 2 Strata Flash ROM 1 3 1 2 1 Intel Strata Flash 128M bit Memory Features ...
Страница 47: ...Barracuda PDA Maintenance 46 Strata Flash Memory Block Diagram ...
Страница 54: ...Barracuda PDA Maintenance 53 DS2760 Block Diagram ...
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