4.11 Keypad Backlight Trouble
-66-
Block Diagram
Backlight Operation
• The keypad LED backlight is controlled with LEDB signal.
• LEDB signal from ABB.
• The LEDs are forward biased and turned on.
Check Points
• LEDB signal
• LEDs
Trouble Shooting Setup
• Connect PIF-UNION to the phone, and power on.
• Enter the engineering mode.
• Go to menu “Baseband
→
LED
→
Backlight
→
Keypad on”
Trouble Shooting Procedure
• Check the soldering of components
• Check the LEDB signal
• Check LEDs
Check
KEY_LED signal
R422,R423
Check
soldering !
Summary of Contents for L1100
Page 1: ...Service Manual Model L1100 Service Manual L1100 P N MMBD0032801 Date June 2004 Issue 1 0 ...
Page 31: ... 30 Figure 14 Power Supply Scheme ...
Page 46: ... 45 Figure 25 CLC344E Camera Chip Circuit ...
Page 49: ... 48 Figure 28 Camera Module Circuit MAIN BOARD FPCB ...
Page 62: ...4 9 Microphone Trouble 61 Circuit Diagram ...
Page 82: ... 81 U602 FPCB CN2 1 3 U601 5 4 Test Points 1 20 2 19 ...
Page 98: ...5 1 Disassembly 5 ASSEMBLY INSTRUCTION 97 2 1 1 2 ...
Page 99: ...98 1 2 3 2 1 ...
Page 100: ... 99 1 2 3 ...
Page 101: ... 100 ...
Page 103: ...6 2 Download Procedure 1 Execute Fluid_GUI exe and select Erase Program flash menu 104 ...
Page 104: ...2 Click the Add button Then choose m0 file which is going to download 105 ...
Page 108: ...6 Wait for downloading to be finished 109 ...
Page 125: ... 127 9 PCB LAYOUT ...
Page 126: ... 128 9 PCB LAYOUT ...
Page 129: ... 131 12 EXPLODED VIEW REPLACEMENT PART LIST 12 1 EXPLODED VIEW ...