Nokia 9000i - Troubleshooting Diagram of the LCD Check

After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 24
Original, 05/97
3 Troubleshooting Diagram of the LCD Check
The following diagram is to differentiate between an LCD module or a
PDA fault. An LCD module fault is beyond the scope of this document
and requires that a replacement module be fitted.
1.3.2 Check
PDA PWR
0.
Start
1.
NO
LCD ON?
YES
1.2 1.2.1
LCDVCC
NO
LCDVCCON YES
OK? active?
YES
NO
NO
NO
3.1
3. 1.3 1.3.1
LCDPWM
NO
Contrast change
LCDVEE
NO
LCDVEEON YES
OK?
OK? OK?
active?
YES YES YES
5.
Test–patterns
NO
OK?
NO
1.4 1.5
YES
UI flex OK?
YES PCLK,LP,FP,
DISPON
OK?
NO YES
LCD OK!
1.2.2
CPU fault
1.1
Disconnect UI
flex
1.5.1 LCD
module fault
1.4.1 UI flex
fault
2.
Change LCD contrast.
4.
Check LCD test–
patterns.
3.1.1
CPU fault
3.1.2 Check
PDA PWR
1.5.2
CPU fault