Lenovo i909 User manual

Ienovoi909
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.
Page 2

I908 Mobile Phone Maintenance Manual LENOVO
Tableof Contents
1PHONE EXTERIOR......................................................................................................................5
2MAIN BOARD LAYOUT...............................................................................................................7
COMPONENT SIDE: ............................................................................................................................7
3BASEBAND...................................................................................................................................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.........................................................................................................................................14
3.4 KEYPAD AND 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
4RADIOFREQUENCY (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
5ASSEMBLY AND DISASSEMBLY OF THE I909...................................................................28
5.1 TECHNICAL STEPS FOR I909ASSEMBLY...............................................................................28
5.2 I909 PARTS LAYOUT ..............................................................................................................30
5.3 PRECAUTIONS DURING THE ASSEMBLY OF THE I909............................................................31
Page 3

I908 Mobile Phone Maintenance Manual LENOVO
Edition
No. Compiled by/
Modified by
Date of
compilatio
n/modifica
tion
Reasons for
modification Main Changes
Page 4

1Phone 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)
Page 6

I908 Mobile Phone Maintenance Manual LENOVO
2Main Board Layout
Component Side:
Baseband Chip
Receive
r
Contact
Power Management
Double-SPK Pin Connector
Page 7

I908 Mobile Phone Maintenance Manual LENOVO
Keypad Side:
Camera
LCD Connector
Keypad FPC
MMC Card Socket
Stand-by Battery
Vibration Motor
I0 Connector SIM Card Socket
Page 8

I908 Mobile Phone Maintenance Manual LENOVO
3 Baseband
3.1 LCD Display
3.1.1 No display after the phone is turned on
The screen does
Y Y
N
Check the FPC and the main
board connection. Re-connect
and try again
OK
Check for such soldering
problems as pseudo soldering and
bridging at the ports of the LCD
Y
N
OK
Replace LCD
Mdl
Page 9

I908 Mobile Phone Maintenance Manual LENOVO
3.1.2The LCD backlight does not come on
LCD backlight
inactive
Check the FPC and the main
board connection. Re-connect
and try again OK
N
Check for such soldering
problems as pseudo soldering
and bridging at the ports of the
LCD
t
R
ld d
YOK
Y
Check whether the output of
backli
g
ht circuit is above 9V.
N
Replace LCD
Mdl
Y
Replace L1502 or U1508 and
check for the solderin
g
at
N
OK
Page 10

I908 Mobile Phone Maintenance Manual LENOVO
3.2 Ringing and Vibration
3.2.1 The unit does not vibrate
The unit
Y
OK
Check for the connection of
N
Replace motor
Page 11

I908 Mobile Phone Maintenance Manual LENOVO
3.2.2 No ringing sound
No ringing
Y
N
N
Y
Check whether U1205,
U1206 and U1207
function normally
N
Replace U1206
OK
Identify the SPK that makes no
sound. Check the speaker
connection or replace the speaker.
Try again to see if it functions
OK
Page 12

I908 Mobile Phone Maintenance Manual LENOVO
3.3 Charging
3.3.1 The charger has been connected to the phone, but
there is no charging display on the screen
No charging
prompt after
Y Replace
h
Y Replace
btt
N
Is there still a problem
when another batter
y
is
Y
OK
N
Replace
Check the soldering at
U1408 and J1301.
Re-solder and see if it
Is there still a problem
when another charger is
N
Page 13

I908 Mobile Phone Maintenance Manual LENOVO
3.3.2 The screen shows that the phone is charging, but the
battery cannot be fully charged
Y
N
Check for soldering
faults at U1408,
J1301 and U1402.
Touch u
p
and tr
y
OK
The charging
indictor is
N
Y
Replace U1408. OK
N
Y
Replace U1402. OK
N
Replace battery
Page 14

I908 Mobile Phone Maintenance Manual LENOVO
3.4 Keypad and Keypad Backlight
3.4.1 The keypad does not work normally
N
Y
N
The
Disassemble the mobile
phone to check the connection
of
keypad
FPC
and pseudo
Open up the phone and
check if the metal dome is Fix or
replace
metal
Remove the metal dome
and clean the keypad with
alcohol. Attach a new dome
Page 15

I908 Mobile Phone Maintenance Manual LENOVO
3.4.2 The keypad backlight is inactive
Y
N
Y
N
Check the FPC for
possible pseudo
Some of the Replace the
damaged
The keypad
OK
Replace
the FPC
bl
Page 16

I908 Mobile Phone Maintenance Manual LENOVO
3.5 In Call Issues
3.5.1 The voice of the person on the other end of the line
can’t be heard
Y
N
The voice
of the
Remove the upper
cover and check Replace
the
Replace
th
Page 17

I908 Mobile Phone Maintenance Manual LENOVO
3.5.2 The person on the other end of the line can’t hear my
voice
Ｙ
Ｎ
Ｙ
Ｎ
Y
N
Remove the lower cover
and check MIC for any
Replace the MIC and try
i
Check
U1212/R1204/R1209/C121
0/C1211/R1203/R1216 for
possible pseudo soldering
hti it
ＯＫ
Re-so
lder
My voice can’t
Re-s
older
Check
Page 18

I908 Mobile Phone Maintenance Manual LENOVO
Re-solder
U1402
3.6 The Phone cannot be Powered on
N
Firstly check U1402 for pseudo
soldering. Is the output of
VTCXO, VCORE, VMEM and
The
Y
Is U2107 normal at
26MHz?
N Check for pseudo
ld i t
U2106
Y
N
Are there soldering
problems at
U1101
?
Y Touch up
and tr
N Check the U2106
circuit
Re-solder
U1101
Page 19

I908 Mobile Phone Maintenance Manual LENOVO
4Radiofrequency (RF)
4.1 Problems during Software Download
zProblem: The software cannot be downloaded properly.
zCauses: The baseband chip has been fitted the wrong way round or there are problems
with the soldering point; Pseudo soldering on CRYSTAL.
zSolution:
zPlease re-download the software after replacing the defective assemblies.
Check whether the baseband
chip has been fitted the wrong Re-solder U1101
Check U1101 for possible pseudo
The software
cannot be
Y
NYRe-solder U1101
NYRe-solder X2101
Check whether the crystal（X2101）
N
Respectively check X2101 and C2104 and C2148 of
U2101 at Pin31for
p
ossible
p
seudo solderin
g
Re-solder the pseudo
solderin
g
assemblies
Page 20