Note
: To enter the Test mode, press 48#68
on the phone, then hold down * key.
5-8
Troubleshooting
NO
YES
YES
R711 is
well connected?
In the Test mode,
select ’Baseband Test’
then ’LED Test’ then
Backlight ON/OFF.
NO
NO
NO
START
YES
YES
YES
Voltage level
of U703 is high
( Approx. 2V)?
Re-mount R711.
Replace U 703.
Voltage level
of LED pin 1 is same
as the voltage value
of battery?
Replace battery.
Replace
Key back light LED.
CN301(PIN 6)
voltage level is high?
Re-solder
CN301
Replace
the LCD module.
Defected key
backlight.
Defected LCD
EL backlight.
END
END
5.8 Backlight Trouble
Summary of Contents for BD38
Page 1: ...GSM PHONE SERVICE MANUAL MODEL BD38 1st version 2004 06 09 ...
Page 2: ...Rev 1 00 ...
Page 32: ...5 14 Troubleshooting ...
Page 35: ...6 PCB Diagram 6 1 Main PCB 6 1 Top View ...
Page 36: ...6 2 PCB Diagram Bottom View ...
Page 42: ...8 Exploded View and Parts List 8 1 Exploded View Main 8 1 1 Main 8 1 ...
Page 46: ...9 Block Diagram 9 1 BB Block Diagram 9 1 ...
Page 47: ...Block Diagram 9 2 RF Block Diagram 9 2 ...
Page 48: ...10 Schematic Diagram 10 1 Key Pad 10 1 ...
Page 49: ...10 2 Schematic Diagram 10 2 Main Board 10 2 1 Chipset ...
Page 50: ...10 3 Schematic Diagram 10 2 2 Memory Melody ...
Page 51: ...10 4 Schematic Diagram 10 2 3 Audio SIM ...
Page 52: ...10 5 Schematic Diagram 10 2 4 Connector ...
Page 53: ...10 6 Schematic Diagram 10 3 RF Top Schematic 10 3 1 RF PAM ...
