8.
Level 3 Repair
8-1. Block Diagram
VMEM_1.8V
NCS_FLASH / NCSRAM
PHONE MEMORY
SYSRST
OEn/WEn
FMM640D0B-12IA
MD(0:15) / A(17:2 0)
LB / UB
NOR
64Mb
A(13)*F-RDY/R-WAIT# / A(14)*CLK / A(15)*AVD#
PSRAM
32
Mb
32Mb
32.76 8kHz
VMEM_1.8V
MAIN LCD
VGPIO2.8V
QQVGA
(128x128)
SYSRST
TX MODULE
LED_K1/
LED_K2
MD(0:7) /NCS(0)/A(20)/Wen/LED_A
(AM7808)
RX/TX
LED Drv.
(FAN5622SX)
Modem
(PNX4848)
VSIM_3.0V
SPK_P
SPK_N
SPK & RECEIVER
SIM
SIM_DATA
EAR_N
SIM_RST
SIM
VCM_OUT
SIM_CLK
EAR_P
EARSPK
Li- Ion Battery
(Standard)
800mAh
AUX_MIC_P
AUX_MIC_N
EARMIC
MIC_P
MIC_N
MIC
VBAT
KEYPA D
KEYIN/IO(0:2)
MOTOR
KEYOUT(0:3)
KEY_LED_3.3V
8-1
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VBAT
Level 3 Repair
8-2. PCB Diagrams
8-2-1. Top
LED300
SPK300
L308
C315
ZD302
C115
L307
ZD301
U101
R310
R309
R308
C118
R306
R307
C308
C312
C316
TR200
L306
L305
R305
C221
R300
R302
L302
R303
MOT100
C222
L304
L303
C309
R211
C310
C305
IFC300
C311
ZD300
L300
ZD200
L301
C133
BTC200
R215
SIM300
C102
R113
R101
R100
C119
C104
C100
U102
R102
C130
U100
R103
C227
C103
C101
R217
R218
R219
R220
C325
C313
C328
R313
C326
C314
R318
C329
R317
C330
R221
R222
CN100
SC105
SC108
SC106
C131
C120
C122
C121
TP100
C226
C209
R213
C224
R314
SC104
SC109
R112
C105
PAM100
C327
C323
R316
C324
C320
C319
R31 5
C318
C205
C110
C109
L102
R319
TH200
C111
C208
L10 1
C207
L200
C223
C203
C225
C204
C304
C210
R312
C200
R311
R212
R214
C300
L201
C303
C306
C307
SC103
C202
C214
C206
U200
C113
F100
L108
L107
C124
C123
OSC201
SC101
TP201
SC102
SC107
C212
TP202
TP200
R200
C211
R204
TP101
UME200
R207
R205
C117
R111
C201
OSC200
C217
C216
R203
R208
C215
C220
R206
C116
R110
L105
C126
C114
C127
C106
L106
C129
R210
R209
C219
ZD303
C218
SC100
R201
C213
L104
RFS100
C132
R202
C108
C135
L311
V301
C322
C317
L312
C321
L313
L314
L315
L310
MIC300
L309
BAT200
C134
R106
10
9
C331
R117
CON100
R
10
7
R116
R108
R121
R119
R104
R122
R105
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Level 3 Repair
8-2-1. Bottom
V300
R301
C302
C301
LCD300
INT
SOFT301
RIGHT
LEFT
SOFT300
UP
SEND
END
DOWN
LED304
LED303
2
30
IT
IG
IG
IT
30
0
DIGIT301
30
IT
IG
D
DIGIT305
DIGIT304
DIGIT306
DIGIT308
DIGIT307
LED302
LED301
STAR
SHARP
DIGIT309
R120
R118
R114
R115
8-3
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Level 3 Repair
8-3. Flow Chart of Troubleshooting
presetting methods for checking TP
- GND & TP(exp. VBAT=C105 ) using Oscilloscope
- look over the coming out signal.
Oscilloscope
GND
8-4
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Multi-meter
8-5
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Level 3 Repair
Checking the TP(test point) using Multi-meter
- EX) to look up the TP, shunt Cap.
- if checking the GND, you can listen "beep"
if checking the Signal, you can't listen it.
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Level 3 Repair
8-3. LOGIC
8-3-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.5V
(TP:C308)
No
Change the Battery
Yes
Check the Clock at
OSC201 (1,4, 32.768kHz,
20ppm)
No
replace the OSC201
Yes
Check the Clock at
OSC200 1,3pin
(when normal operating
condition, 26MHz 11ppm)
No
Check the Main Chip
(to lookover the Chip damage)
(TP : OSC200 1,3pin / look over the waverform
using the oscilloscope)
Yes
Check the initial operation
Yes
END
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8-8
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8-3-2. Initial
8-9
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Initial Failure
Yes
No
LCD_RST > 1.7V ?
Change PBA.
Yes
Check the 16bit data signals.
Yes
END
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8-11
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8-3-3. Sim Part
Phone can't access SIM Card
Yes
SIM300 pin1, pin4
No
3.0V?
Resolder or Replace SIM300
and
pin3(SIM_CLK) 3MHz ?
Yes
Check signal sequence,
VSIM_3.0V(C314)
SIM_DATA(C313)
SIM_CLK
SIM_RST
No
Change PBA
Yes
Check the SIM Card (is broken?)
Yes
END
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8-13
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8-3-4. Microphone Part
Microphone does not work
Yes
C320 = 2.4V
at Mic Active?
No
Replace U200 using a Heatgun
(Because of not soldering well)
Yes
Check the MIC Connection
(look over schematics about
schemetics.)
No
Resolder
L311,L312,L313,R315,C320,C317,C321
(not work if those are not connected.)
Yes
Check the MIC sample.
(it be possible the problem
things)
No
Replace an another MIC
(because of being possible the problem)
Yes
END
8-14
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8-15
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8-3-5. Ear Microphone Part
Ear Microphone does not work
Yes
C308 2.1V
at Ear Mic Active?
No
Replace U200 using a Heatgun
(Because of not soldering well)
Yes
Check the Ear MIC Connection
(look over schematics about
schemetics.)
No
Resolder C303,C306,R303,L302,L303
(not work if those is not connected.)
Yes
Check the Headset sample.
(it be possible the problem
things)
No
Replace an another Headset
(because of being possible the problem)
Yes
END
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8-17
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8-3-6. Speaker Part
Speaker does not work
Yes
L307, L308
> 2.0 V
No
(Wiring the SPK N/P and
checking an waveform using
oscilloscope)
Resolder L307& L308
(be possible because of soldering not well)
Yes
No
Does not work Voice call ?
Replace U200 using a Heatgun
(be possible of being U200 a bad sample)
Yes
Does not work Ringtone?
(Menu->Settings->Sound
profiles->Edit->
select the Call ringtone)
No
Resolder or Replace U200, SPK300
(be possible of soldering not well or being
U200 a bad sample)
No
Change Speaker
(be possible of SPK Problems
or not inserting it right.)
Yes
Is Speaker working?
(Listening through the
speaker)
Yes
END
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8-19
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8-20
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8-3-7.
Motor Part
Motor does not work
Yes
C118 = 3.3V
at Motor Active?
No
Replace U101 using a Heatgun
(Because of not soldering well)
Yes
Check the Motor Connection
(look over schematics about
schemetics.)
No
Resolder MOT100
(not work if those is not connected or
not soldering well.)
Yes
Check the Motor sample.
(it be possible the problem
things)
No
Replace an another Motor module sample
(because of being possible the problem)
Yes
END
8-21
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8-22
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8-23
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8-3-8. Key Data Input
Check Initial Operation
Yes
Check the SUB
Is it the 34
key or the SUB
key?
key domesheet
SUB key
No
(adhesion
Change the SUB key
domesheet
or adhere correctly to
SUB PBA.
condition, foreign
substances)
34 Key
Yes
Check the 34 key
domesheet
(adhesion condition,
foreign substances)
No
Change the 34 key
domesheet
or adhere correctly to
PBA.
Yes
Check the key
circuit.
(not connected, not
soldered, short)
Check the
connection
condition. (not
connected slide
FPCB)
No
No
resolder L309 L310 L314
L315 C331 ZD303
Yes
Check the SUB PBA
(is broken?)
Yes
END
Yes
END
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Reconnect slide
FPCB
Level 3 Repair
8-25
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8-3-9. Back Light (LCD)
LCD does not work
Yes
Check the LCD FPCB
(connection, broken)
No
Change the LCD module or connect the LCD
FPCB to SUB PBA correctly.
No
Change the SUB PBA or connect the slide
FPCB to PBA correctly.
Yes
Check the slide FPCB
(connection, broken)
Yes
No
The Voltage at C329=VGPIO?
Resolder the C329
Check the LCD300 mounted to PBA correctly.
Yes
END
8-26
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8-27
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8-28
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8-3-10. GSM900 Rx
RX ON
Cell Power : -60dBm
Yes
PAM100 Pin10
-65dBm
No
Resolder PAM100,
Yes
PAM100 Pin12
-68dBm
No
No
Check PAM100
control check
Yes
Yes
F100 6,7pin, L106,
L108
-75dBm
No
Resolder F100,L106,L108
Yes
Check U200 is working
Yes
END
8-29
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Check ANT Switch
control circuit
Resolder PAM100
Level 3 Repair
8-3-11. DCS Rx
RX ON
Cell Power : -60dBm
Yes
PAM100 Pin10
-65dBm
No
Resolder PAM100,
Yes
No
PAM100 Pin12
-68dBm
Check PAM100
control check
No
Yes
Yes
F100 9,8pin, L105,
L107
-75dBm
No
Resolder F101,L105,L107
Yes
Check U200 is working
Yes
END
8-30
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Check ANT Switch
control circuit
Resolder PAM100
Level 3 Repair
8-31
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8-32
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8-3-12. GSM900 Tx
TX Power is too Low!!
TX ON (5Level)
CLOCK CHECK?
26MHz @ OSC200 (pin1,
pin3)
NO
Re-solder OSC200
YES
PAM100 pin27 -1
dBm
(R106 using spectrum
analyzer)
NO
Re-solder or change
UCP200
YES
NO
Check the Voltage
C103 3.3V?
Check the UCP200 & VBAT
circuit.
YES
PAM100 Pin17
30dBm
(R100 using spectrum
analyzer)
NO
Resolder PAM100
YES
NO
Check the RFS100
connection with PCB?
Resolder RFS100.
YES
Antenna
re-solder or change
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8-3-13. DCS Tx
TX Power is too Low!!
TX ON (5Level)
CLOCK CHECK?
26MHz @ OSC200 (pin1,
pin3)
NO
Re-solder OSC200
YES
PAM100 pin29 -1
dBm
(L111 using spectrum
analyzer)
NO
Re-solder or change
UCP200
YES
NO
Check the Voltage
C103 3.3V?
Check the UCP200 & VBAT
circuit.
YES
PAM100 Pin17
30dBm
(R100 using spectrum
analyzer)
NO
Resolder PAM100
YES
NO
Check the RFS100
connection with PCB?
Resolder RFS100.
YES
Antenna
re-solder or change
8-34
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8-35
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8-36
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- NC Point(Top View)
: NC
U200
8-37
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UME200
8-38
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LED300
SPK300
L308
C31 5
ZD302
C115
L307
ZD301
U101
R310
R308
R309
C118
R306
R307
C308
C312
C316
TR200
L306
L305
R300
R302
L302
R303
MOT100
R305
C221
R211
C222
L304
L303
C309
C305
IFC300
C311
C310
ZD300
L300
ZD200
L301
C133
BTC200
R215
SIM300
C104
R101
R100
C102
C119
C130
U100
C100
R113
U102
R103
R102
C227
C103
C101
R217
R218
R219
R220
C325
C313
C328
R313
C326
C314
R317
C330
R318
C329
R221
R222
CN100
SC105
SC108
SC106
C131
C120
C122
C121
TP100
C226
C209
R213
C224
R314
SC104
SC109
R112
C105
PAM100
C327
C323
C324
R316
C320
C319
R31 5
C318
C205
C110
C109
L102
R319
TH200
C111
C208
L10 1
L200
C207
C203
C223
C210
C204
C304
C225
L201
R312
R311
R214
R212
C300
C200
C303
C306
C307
SC103
C202
C214
C206
U200
C113
F100
L108
L107
C124
C123
OSC201
SC101
TP201
C212
SC102
SC107
R204
TP202
TP200
R200
C211
TP101
UME200
R207
R205
C117
R111
C201
OSC200
C217
C216
R203
R208
C215
C220
R206
C116
R110
L105
C126
C114
C127
C106
L106
C129
R210
R209
C219
ZD303
C218
SC100
R201
C213
L104
C108
R202
RFS100
C132
C135
L311
V301
L312
C321
C317
C322
L313
L314
L315
L310
MIC300
L309
BAT200
C134
R106
10
C331
R117
CON100
10
7
R116
R108
R121
R119
R104
R122
R105
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