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8. Level 3 Repair
8-1
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8-1. Block Diagram
Modem
(PNX4848)
MAIN LCD
MD(0:7) /NCS(0)/A(20)/Wen/LED_A
VGPIO2.8V
VMEM_1.8V
QQVGA(128x128)SYSRST
SIM
VSIM_3.0V
32.768kHz
NCS_FLASH / NCSRAMVMEM_1.8V
MD(0:15) / A(17:20)
LB / UB
SYSRSTPHONE MEMORY
NOR
32Mb
OEn/WEn
A(13)*F-RDY/R-WAIT# / A(14)*CLK / A(15)*AVD#
SIM_RST
SIM_CLK
LED Drv. (FAN5622SX)
LED_K1/LED_K2 VBAT
MOTORMVBAT
KEYIN/IO(0:2)
KEYOUT(0:3)
CKEYPAD
Li- Ion Battery(Standard)800mAh
SIM
SIM_DATA
MICMIC_N
MIC_P
EARMICAUX_MIC_P
AUX_MIC_N
KEY_LED_3.3V
EAR_N
EAR_P
EEAARRSSPPKK
SSPPKK && RREECCEEIIVVEERR
SPK_P
SPK_N
VCM_OUT
TX MODULE
(AM7808) RX/TX
FMM640D0B-12IA
64Mb
PSRAM32Mb
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Level 3 Repair
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8-2. PCB Diagrams8-2-1. Top
BAT200
BTC200
C100
C101C102
C103
C104
C105
C106
C108
C109
C110
C111
C113
C114
C115
C116
C117
C118
C119
C120
C121
C122
C123
C124C126
C127
C129
C130
C131
C132
C133
C134
C135
C200
C201
C202
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
C218
C219
C220
C221
C222
C223
C224
C225
C226
C227
C300
C303
C304
C305
C306
C307
C308
C309
C310
C311
C312
C313
C314
C315 C316
C317
C318
C319C
320
C321
C322
C323C
324
C325
C326
C327
C328
C329
C330
C331
CN100
CON100
F100
IFC300
L101
L102
L104
L105L106
L107
L108
L200
L201
L300
L301
L302
L303
L304
L305
L306
L307
L308
L309
L310
L311
L312
L313
L314
L315
LED300
MIC300
MO
T100
OSC
200
OSC
201
PA
M100
R100
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R116
R117
R119
R121R122
R200
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
R215
R217
R218
R219
R220
R221
R222
R300
R302
R303
R305
R306
R307
R308
R309
R310
R311
R312
R313
R314
R31
5R
316
R317
R318
R319
RFS100
SC100
SC101
SC
102
SC103
SC
104
SC105
SC
106
SC
107
SC108
SC
109
SIM300
SPK
300
TH200
TP100
TP101
TP200
TP20
1
TP202
TR200
U100
U101
U102
U200
UM
E200
V301
ZD200
ZD300ZD
301
ZD302
ZD303
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Level 3 Repair
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8-2-1. Bottom
C301
C302
DIGIT30
0
DIGIT301
DIGIT302
DIGIT303 DIGIT304DIGIT305
DIGIT306DIGIT307
DIGIT308
DIGIT309
DOWNEND
INT
LCD300
LED
301
LED
302
LED303
LED304
LEFT
R114 R115R118R120
R301
RIG
HT
SE
ND
SHARP
SO
FT300
SOFT301
STAR
UP
V300
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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
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← Multi-meter
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← 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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8-3. LOGIC
8-3-1. Power On
Check the Battery Voltageis more than 3.5V
(TP:C308)
' Power On ' does not work
Change the Battery
END
No
Yes
Check the Clock atOSC201 (1,4, 32.768kHz,
±20ppm)
No
Yes
Check the initial operation
Yes
Yes
replace the OSC201
Check the Clock atOSC200 1,3pin
(when normal operatingcondition, 26MHz ±11ppm)
Yes
NoCheck the Main Chip
(to lookover the Chip damage)
(TP : OSC200 1,3pin / look over the waverform
using the oscilloscope)
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Level 3 Repair
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8-3-2. Initial
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Level 3 Repair
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Initial Failure
END
LCD_RST > 1.7V ?
Yes
Yes
NoChange PBA.
Check the 16bit data signals.
Yes
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8-3-3. Sim Part
SIM300 pin1, pin4
≥ 3.0V?
and
pin3(SIM_CLK) ≥ 3MHz ?
Phone can't access SIM Card
Resolder or Replace SIM300
Check the SIM Card (is broken?)
END
No
Yes
Yes
No
Change PBA
Check signal sequence,VSIM_3.0V(C314) →SIM_DATA(C313) →
SIM_CLK→SIM_RST
Yes
Yes
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8-3-4. Microphone Part
C320 = 2.4Vat Mic Active?
Check the MIC Connection(look over schematics about
schemetics.)
Replace U200 using a Heatgun(Because of not soldering well)
Resolder
L311,L312,L313,R315,C320,C317,C321
(not work if those are not connected.)
END
No
Yes
Yes
Yes
Yes
No
Check the MIC sample.(it be possible the problem
things)
No Replace an another MIC
(because of being possible the problem)
Microphone does not work
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8-3-5. Ear Microphone Part
C308≥ 2.1Vat Ear Mic Active?
Check the Ear MIC Connection(look over schematics about
schemetics.)
Replace U200 using a Heatgun(Because of not soldering well)
Resolder C303,C306,R303,L302,L303
(not work if those is not connected.)
END
No
Yes
Yes
Yes
Yes
No
Check the Headset sample.(it be possible the problem
things)
No Replace an another Headset
(because of being possible the problem)
Ear Microphone does not work
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8-3-6. Speaker Part
L307, L308> 2.0 V
(Wiring the SPK N/P andchecking an waveform using
oscilloscope)
Does not work Voice call ? Replace U200 using a Heatgun(be possible of being U200 a bad sample)
No
Yes
No
Resolder L307& L308
(be possible because of soldering not well)
Yes
Does not work Ringtone?(Menu->Settings->Sound
profiles->Edit->select the Call ringtone)
Resolder or Replace U200, SPK300(be possible of soldering not well or being
U200 a bad sample)
No
Yes
END
Is Speaker working?(Listening through the
speaker)
Change Speaker(be possible of SPK Problems
or not inserting it right.)
No
Yes
Speaker does not work
Yes
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8-3-7. Motor Part
C118 = 3.3Vat Motor Active?
Check the Motor Connection(look over schematics about
schemetics.)
Replace U101 using a Heatgun(Because of not soldering well)
Resolder MOT100
(not work if those is not connected or
not soldering well.)
END
No
Yes
Yes
Yes
Yes
No
Check the Motor sample.(it be possible the problem
things)
No Replace an another Motor module sample
(because of being possible the problem)
Motor does not work
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8-3-8. Key Data Input
Check Initial Operation
Yes
Check the 3×4 keydomesheet
(adhesion condition,foreign substances)
Change the 3×4 keydomesheet
or adhere correctly toPBA.
3×4 Key
Check the keycircuit.
(not connected, notsoldered, short)
resolder L309 L310 L314L315 C331 ZD303
No
Yes
END
No
Is it the 3×4key or the SUB
key?
SUB key Change the SUB keydomesheet
or adhere correctly toSUB PBA.
Check the SUBkey domesheet
(adhesioncondition, foreign
substances)
No
Yes
Yes
Check the SUB PBA(is broken?)
Yes
END
Check theconnection
condition. (notconnected slide
FPCB)
Reconnect slideFPCB
No
Yes
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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 LCDFPCB to SUB PBA correctly.
Yes
Resolder the C329Check the LCD300 mounted to PBA correctly.
NoThe Voltage at C329=VGPIO?
END
Yes
Check the slide FPCB(connection, broken)
No Change the SUB PBA or connect the slideFPCB to PBA correctly.
Yes
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8-3-10. GSM900 Rx
RX ONCell Power : -60dBm
PAM100 Pin10 ≥-65dBm
Yes
Resolder PAM100,No
Yes
NoCheck PAM100control check
PAM100 Pin12 ≥-68dBm Check ANT Switch
control circuitNo
YesResolder PAM100
Yes
Resolder F100,L106,L108F100 6,7pin, L106,
L108≥-75dBm
Yes
No
Check U200 is working
Yes
END
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8-3-11. DCS Rx
RX ONCell Power : -60dBm
PAM100 Pin10 ≥-65dBm
Yes
Resolder PAM100,No
Yes
NoCheck PAM100control check
PAM100 Pin12≥-68dBm
Check ANT Switchcontrol circuit
No
YesResolder PAM100
Yes
Resolder F101,L105,L107F100 9,8pin, L105,
L107≥-75dBm
Yes
No
Check U200 is working
Yes
END
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Check the VoltageC103 〉3.3V?
8-3-12. GSM900 Tx
TX Power is too Low!!
TX ON (5Level)
CLOCK CHECK?26MHz @ OSC200 (pin1,
pin3)
NORe-solder OSC200
YES
PAM100 pin27 ≥ -1dBm
(R106 using spectrumanalyzer)
NO Re-solder or changeUCP200
YES
NO Check the UCP200 & VBATcircuit.
YES
NOResolder PAM100
PAM100 Pin17 ≥30dBm
(R100 using spectrumanalyzer)
YES
Resolder RFS100.Check the RFS100connection with PCB?
YES
Antennare-solder or change
NO
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Check the VoltageC103 〉3.3V?
8-3-13. DCS Tx
TX Power is too Low!!
TX ON (5Level)
CLOCK CHECK?26MHz @ OSC200 (pin1,
pin3)
NORe-solder OSC200
YES
PAM100 pin29 ≥ -1dBm
(L111 using spectrumanalyzer)
NORe-solder or change
UCP200
YES
NOCheck the UCP200 & VBAT
circuit.
YES
NOResolder PAM100
PAM100 Pin17 ≥30dBm
(R100 using spectrumanalyzer)
YES
Resolder RFS100.Check the RFS100
connection with PCB?
YES
Antennare-solder or change
NO
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- NC Point(Top View)
: NC
U200
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UME200
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BAT200
BTC200
C100
C101C102
C103
C104
C105
C106
C108
C109
C110
C111
C113
C114
C115
C116
C117
C118
C119
C120
C121
C122
C123
C124C126
C127
C129
C130
C131
C132
C133
C134
C135
C200
C201
C202
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
C218
C219
C220
C221
C222
C223
C224
C225
C226
C227
C300
C303
C304
C305
C306
C307
C308
C309
C310
C311
C312
C313
C314
C315 C316
C317
C318
C319C
320
C321
C322
C323C
324
C325
C326C
327C328
C329
C330
C331
CN100
CON100
F100
IFC300
L101
L102
L104
L105L106
L107
L108
L200
L201
L300
L301
L302
L303
L304
L305
L306
L307
L308
L309
L310
L311
L312
L313
L314
L315
LED300
MIC300
MO
T100
OS
C200
OSC
201
PA
M100
R100
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R116
R117
R119
R121R122
R200
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
R215
R217
R218
R219
R220
R221
R222
R300
R302
R303
R305
R306
R307
R308
R309
R310
R311
R312
R313
R314
R31
5R
316
R317
R318
R319
RFS100
SC100
SC101
SC
102
SC103
SC
104
SC105
SC
106
SC10
7
SC108
SC10
9
SIM300
SP
K300
TH200
TP100
TP101
TP200
TP20
1
TP202
TR200
U100
U101
U102
U200
UM
E200
V301
ZD200
ZD300
ZD301
ZD302
ZD303