Ienovo i909
Mobile Phone
Maintenance Manual
LENOVO
I908 Mobile Phone Maintenance Manual LENOVO
File name: Lenovo i909 Mobile Phone Maintenance Manual
Edition: V1.0
Date: September 7, 2007
File No.:
Status:
Preface
This is an instruction manual used as a maintenance guide for Lenovo I909 both during
producing and after sale.
This manual is subject to modifications as is deemed necessary by further
technological development.
copyright statement
The copyright for this manual is the property of Lenovo Mobile Communication
Technology Ltd. Any person that duplicates this manual without Lenovo’s written approval
will be liable to prosecution.
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I908 Mobile Phone Maintenance Manual LENOVO
Table of Contents
1 PHONE EXTERIOR......................................................................................................................5
2 MAIN BOARD LAYOUT...............................................................................................................7
COMPONENT SIDE: ............................................................................................................................7
3 BASEBAND...................................................................................................................................9
3.1 LCD DISPLAY...........................................................................................................................9
3.1.1 No display after the phone is turned on.........................................................................9
3.1.2 The LCD backlight does not come on......................................................................10
3.2 RINGING AND VIBRATION .......................................................................................................11
3.2.1 The unit does not vibrate...............................................................................................11
3.2.2 No ringing sound..............................................................................................................1
3.3 CHARGING .............................................................................................................................13
3.3.1 The charger has been connected to the phone, but there is no charging display on
the screen.....................................................................................................................................13
3.3.2 The screen shows that the phone is charging, but the battery cannot be fully
charged
3.4 KEYP AD AN D KEYPAD BACKLIGHT.........................................................................................15
3.4.1 The keypad does not work normally............................................................................15
3.4.2 The keypad backlight is inactive...................................................................................16
3.5 IN CALL ISSUES........................................................................................................................1
3.5.1 The voice of the person on the other end of the line can’t be heard.......................17
3.5.2 The person on the other end of the line can’t hear my voice...................................18
3.6 THE PHONE CANNOT BE POWERED ON.................................................................................19
.........................................................................................................................................14
4 RADIOFREQUENCY (RF).........................................................................................................20
4.1 PROBLEMS DURING SOFTWARE DOWNLOAD........................................................................20
4.2 PRODUCTION CALIBRATION...................................................................................................21
4.2.1 AFC calibration................................................................................................................21
4.2.2 Rx path loss........................................................................................................................22
4.2.3 PCL....................................................................................................................................22
4.3 TESTING OF THE UNIT/PROBLEMS DURING REPAIR..............................................................24
4.3.1 Switch Spectrum and Ramp Mask overrun...................................................................24
4.3.2 Significant frequency error................................................................................................25
4.3.3 Significant phase error ......................................................................................................25
4.3.4 Power output problems..................................................................................................26
5 ASSEMBLY AND DISASSEMBLY OF THE I909...................................................................28
5.1 TECHNICAL STEPS FOR I909 ASSEMBLY...............................................................................28
5.2 I909 PARTS LAYOUT ..............................................................................................................30
5.3 PRECAUTIONS DURING THE ASSEMBLY OF THE I909............................................................31
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I908 Mobile Phone Maintenance Manual LENOVO
Date of
Edition
No.
Compiled by/
Modified by
compilatio
n/modifica
Reasons for
modification
Main Changes
tion
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1 Phone Exterior
Figure 1.1 Frontal view of the unit
I908 Mobile Phone Maintenance Manual LENOVO
Figure 1.2 Figure 1.2 Rear view of the unit (battery removed)
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I908 Mobile Phone Maintenance Manual LENOVO
2 Main Board Layout
Component Side
Receiver
Contact
:
Baseband Chip
Power Management
Double-SPK Pin Connector
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I908 Mobile Phone Maintenance Manual LENOVO
Keypad Side:
Camera
LCD Connector
Vibration Motor
Keypad FPC
I0 Connector
MMC Card Socket
Stand-by Battery
SIM Card Socket
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I908 Mobile Phone Maintenance Manual LENOVO
3 Baseband
3.1 LCD Display
3.1.1 No display after the phone is turned on
Y Y
Check the FPC and the main
board connection. Re-connect
and try again
Check for such soldering
problems as pseudo soldering and
bridging at the ports of the LCD
The screen does
OK
N
Y
OK
N
Replace LCD
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I908 Mobile Phone Maintenance Manual LENOVO
g
g
3.1.2 The LCD backlight does not come on
Check the FPC and the main
board connection. Re-connect
and try again
Check for such soldering
problems as pseudo soldering
and bridging at the ports of the
Check whether the output of
backli
Replace L1502 or U1508 and
check for the solderin
LCD backlight
inactive
N
N
ht circuit is above 9V.
N
at
OK
Y
OK
Y
Replace LCD
Y
OK
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