F120 PCBA Service Manual(20130417)
Contents
1. se Canol POWE ON mesias iii ii idad 17 A MODI TT 17 Set Black SCC A ene terende dennen 17 6 0 2 AIG Mess Be oc Nasa 17 C4 Keypad NVa aa 18 85 Lete d Susie TTT 18 891 Cann 634111 urls 18 852 Vibrate with ETO aa een 18 8 5 Ty RTT eint GIFCUIL Proble Maat 19 8 6 1 Cannot Check T s lel ici 19 862 GannovAnswer IIE aa 19 Page 3 of 26 069 AMONG THROU La aon etn 19 Sh AUG CEE ODIGM rented tete taensdearandeetsueoscacmesea 20 8 7 1 BE GIEVE SIenNCe eee er PE EP 21 ee NING CNC T 21 06 O ennen 21 80 NORG renner conten eam nian eae wee 22 Boe MESS Cl Ce TT 29 S9 AEFASMPIOPDIOM nebe tnt ante 22 S91 Cannot 1aentiy Card usas 22 ade Cannot Rea 0 entered 22 E DIEM sten aanne 22 S ME ODIN a a a a a a ante eno renee 23 Sele Gamonal dalla 23 Selo GANON DS IN sais se do ae 24 A Stallone 25 Page 4 of 26 1 Brief Introduction F120 is the phone of GSM amp GSM dual standby but single using SC6531 GSM base band chip integrated with MCU and DSP part such as CPU in PC SC2661 is the RF PA chip which deals with the power control of RF Flash makes up of flash ROM and UtRAM Please read this document to be familiar with the phone refer it to maintain the PCBA 2 Security Items Before maintain please remember the items as follows 2 1 Brief Notices The phone makes up of many integrate circuit and electric components do not use them in dusty humidity and dirty area The some components has polarity static sensitivi2. FI Haacry Pargaztar chap Scasoomisaodiscebob5H Hede Cal Hede ennet 7 Seno commend power xlep factor getting Soccer lll band ECE pel 5 t aeter 15000 eed walls Lle mble La Ewit Cheer Log Choose COM port Page 25 of 26 a Pa nett A rey oom at TTI motel with the mobile Page 26 of 26
3. MIC_IN should lt 0 4V 2 Check R121 is emptily soldering 3 Check CPU is emptily soldering 8 6 3 None in out Steps 1 Check the connector is emptily soldering 2 Check the audio in out circuit is emptily soldering 3 Check CPU is emptily soldering Page 19 of 26 8 7 Audio Circuit Problem MAIN MIC The speaker trace width should be 0 5mm Page 20 of 26 should af ford 500mA current RECIEVER Circuit 8 7 1 RECIEVER Silence Steps 1 Check the contact of RECIEVER 2 Check B455 and B456 is emptily soldering 3 Check CPU is emptily soldering 8 7 2 MIC Silence Steps 1 Check the connection of MIG 2 Check B400 B401 C400 and C401 is emptily soldering 4 Check CPU is emptily soldering 8 8 Camera Problem LKR YAT i l 1 Page 21 of 26 8 8 1 Not Ready Steps 1 Check the CAMERA connector is emptily soldering 2 Check the power manager chip is emptily soldering 3 Check CPU is emptily soldering 8 8 2 Mess Screen Steps 1 Check the connector is emptily soldering 2 Check CPU is emptily soldering 8 9 T Flash Problem A f BR TE SILO 8 9 1 Cannot Identify Card Steps 1 Check the connector of T Flash card PIN of T Flash is emptily soldering 2 Check CPU is emptily soldering 8 9 2 Cannot Read Data Steps 1 Check the connector of T Flash card is emptily soldering 2 Check CPU is emptily soldering 8 10 SIM Problem Steps 1 Firstly check the SIM slot is emptily soldering Pag
4. OM program open the bus to send the signal and then execute the file in flash open the backlight and screen to enter the power on mode 7 RF Elements 7 1 RF Structure d Switch logic control CRYSTAL 25M 900931 ATV_CLK E i LL a TX Low band 2 High band L TS EN PA logic control RE_VRAMP 7 2 SC2661 Introduction SC2661 is a power dual band front end module supports GSM and DCS The specifications are as follows 1 Dual band Power Amplifier 2 O to 6dBm Drive Level 7 3 RX Loop The Rx loop of GSM900 is as same as DCS1800 so only descript the GSM receive loop Because it integrates with RF module SC6531 the external equipments reduce any more the bug rate reduces too Page 13 of 26 The RX signal runs to SC6531 RF from antenna switch SAW FILTER through matched circuit The SC6531 choose GSM900 under control signal and divided the RX TX signals through filter The signal input to SC6531 through matched circuit blow up low noise mixing band pass filter intermediate frequency blow up mixing filter I O output 7 4 TX Loop Four 1 Q signals input l Q modulation mixing PA amplifier output Antenna switch Antenna transmit 7 5 RF FAQ The main problem of RF is BT failure The PCBA BT is Board Test makes up of two parts as battery calibration and RF calibration The battery calibration main adjust the coefficient between phone and battery to display voltag
5. Technical Document Model F120 Name F120 PCBA Service Manual No Version V1 0 Drawn wanglinwen Check Sign Standard Approved Amendment Records l Drawn Brief No Version Date Reason l Amender Introduction poo 9 Note1 Fill in this table when you amend it every time Note2 When you file it for the first time write None in the Reason and Brief Introduction Page 2 of 26 8 Contents SIT BT Reise igre eT 5 SCENES MS asia 5 BoM TOPIC INOUIC CS ennen 5 22 TEQUIPRIentS enne Sissi 5 TeSt TOOS Oe SOUS AAA A e E o Pr POE OP II II T EEA 5 Sr FROST OOS aa aca a a 5 32 TOOL SOTING Seti is 5 AO ee ee EEE 6 sat OPI a 6 A2 c s ne gt Peer a E Pet ene Pee 7 Base Band Elements Circuit ANalySIS ooooooononnccnnonaninooncnononanoononanononanonannanonanos 7 5 1 SC6531 Typical Application T 8 D2 AVS EN UOC rea 8 53 POWER eE lt Te 711271 ON 9 5A SIOPAge MENACE erian EO TE EO ET 9 S Y EL eted etn dO T 9 56 IN E O 9 97 Keypad MENICO ss sia 10 98 Mala Tisk ece 11 ESB Le unto 12 OW GION S eie ee E estara lts 13 Ee PENIS E estes tags eee A A A ed EE Res ai 13 Tic RIP UEC UN en 13 Tie Seba IIT vse Tr lt e ees ccseescscts is so eesti aes 13 TE cs 6 1 8 T 13 Ta O 14 To O eee eee eee Oe eee aE me nee ns a RE eee Ree ae RE ee ne ee 14 O BUESA SIS ads 14 TOUS Secre et ne ream a TOR en DCTs RSTn ne PC mee I Tn ne 15 Sai Cannot DOWNA repisa tee a eco te e 15
6. Trouble amp Service 8 1 Cannot Download Page 15 of 26 Steps 1 Replace the download cable 2 Measure R111 R112 and R113 check that emptily soldering or short circuit 3 Measure the voltages of PMU 4 Replace Flash or crystal of CPU lf the current is too large after inserted the download cable gt 300mA it means that VCHG or VBAT short circuit please power off and find the short circuit point If the current is bigger than 50mA please check DC VCORE 1 1V VDD 2 8V AVDD 2 8V and Page 16 of 26 VRTC 1 8V If the current is very small please check J601 soldering badly Except for above possibilities it maybe 26M clock signal please use the oscillograph to check the two circuits The download mainly conversation between CPU and Flash includes data cable address cable control cable If the exterior circuit has no problem it maybe CPU or Flash soldering badly Analysis Steps Cannot Download gt HMA e Check the current Too small or non current gt 300m4 i Check the solderin Lo S of MO connector Check D D 1 33V Check VCHG K dl or VBAT short S Check the soldering of __ Check circuit to GND Bene tee VCORE LIV ae VDI 2 SV a la __Cheek25M paia gt Ne oulput or wave tousle VRIC LSV Check the soldering of X100 y y Check the soldering of Flash E N and CPU 8 2 Cannot Power on Steps 1 Check the voltages of circuits 2 Ch
7. e 22 of 26 2 Add soldering PMU chip and CPU 8 11 MP3 Problem Internal PA The speaker trace width should be 0 5mm should afford current REEF gt Steps 1 Check exterior equipment is emptily soldering 2 Check CPU is emptily soldering 8 12 Cannot Charged Step 1 Measure the voltage of VCHG is 5V otherwise it means that the connector is emptily soldering Page 23 of 26 2 Check Q200 chip is emptily soldering 8 13 Cannot Write S N Cannot write S N one reason is that serial port is badly the other is that CPU or Memory badness please check the soldering of CPU and Flash gt 40MA ql Check the power of eS Too small or the phone non current Check VBAT and GND of Check VCHG I O connector ee or VBAT short es o circuit to GND Check D D gt 2 8V 3 3V Abnormality VRTC 1 8V ud e Check the soldering of RO200 R0201 RO202 eN Mar E aes Check 26M lt crystal Se eee e AO MA a Check the soldering of Flash S and CPU Fi ee ee Page 24 of 26 8 14 BT Station Calibration Element CPU controls the PA through TX enable control GSM DCS PCS frequency band through control Band select control the amplified value of PA through control the current signal of VPAC The BT failure needs the software to analysis as follows choose the COM port Note Click CONNECT firstly and then plug in PCBA Settings Hizc Iniormat ian Calibration Flash RE SPIO Biumtooth WI
8. e of battery and voltage output RF calibration main adjust the RF parameter to accord with the GSM criterion The battery calibration failure usually includes the voltage of battery charging and current calibration The maintenance method is that check the setup of calibration tool and NV firstly and then check the connection of clamping and PCBA It has no problem it maybe the base chip U100 emptily or cold soldering please soldered again or replace to solve it The RF calibration failure usually is frequency calibration includes GSM DCS PCS TX calibration The error happen during calibrate AFC circuit calibrate the frequency through RF chain So it is caused by RF chain mainly You can open the software to check the RF chain usually the soldering of SW1 and U301 has problems solder again or replace them to solve it If the RF chain has no problem please check X100 26MHz crystal please replace or solder it again If GSM DCS PCS TX frequency calibrate error it maybe U301 emptily soldering please solder them again 7 6 BUG Analysis Coupling Power too Low If the single PCBA connection tests pass but after assembled found the signal is too bad The coupling power is too low during coupling test This problem due to these cases as follows 1 TEST PORT is emptily soldering TEST PORT is a bad one The spring of antenna assembled badly or distortion cannot connect the soldering pad of antenna on PCB Page 14 of 26 8
9. eck the crystal circuit 3 Add soldering of CPU and Flash 8 3 LCD Problem 8 3 1 Black Screen Steps 1 Confirm that LCD circuit 2 8V 2 Check the U100 is emptily soldering 8 3 2 White Mess Blue Screen 1 Check the soldering problem of LCD 2 Check the U100 is emptily soldering Page 17 of 26 8 4 Keypad Invalid Steps 1 Measure the col cable of connector and row cable resistance to GND by multimeter check short circuit 2 If it is short circuit check the soldering tin and measure it by multimeter 3 If not short circuit but high resistance status check the keypad connector is emptily soldering 4 If itis still fail please check CPU is emptily soldering 8 5 Motor Problem 8 5 1 Cannot Vibrate Steps 1 Change the VIB VIB 2 Maybe SC6531 emptily soldering 3 SW is Audio Vibrate 8 5 2 Vibrate with Power on Check the soldering of SC6531 is abnormally Page 18 of 26 8 6 Earphone Circuit Problem Base Element The earphone circuit mainly executed through GPIO47 the earphone executed through HEADMIC_IN Check GPIO00 it is High and check U400 8 6 1 Cannot Check Earphone Steps 1 Check the bottom connector is emptily soldering or connected tin After inserted the earphone GPIO47 cannot draw down 2 Check R408 is emptily soldering 3 Check CPU is emptily soldering 8 6 2 Cannot Answer Calls Steps 1 Check the connector is emptily soldering After press the button on earphone HEAD
10. er and an embedded 16 bit DSP core with the specially optimized architecture and dedicated accelerators The integrated RF transceiver provides the function of radio frequency signal transmition and receiving from or to baseband signal 5 2 System Clock Clock is the base of control in every system It has two types of clock in system 32 68KHZ clock to display the time by system the other one is working clock supplied by X100 26MHZ crystal 1 RTC Real Time Clock Generally the RTC circuit is supplied by VBAT of the main battery 2 System Clock Circuit The clock of module is supplied by X100 26MHZ crystal and supply the consult clock to Page 8 of 26 base band circuit and RF circuit 5 3 Power Management SC6531 supplies power to the main module and the voltage of all ports LED driver alerter driver Charging Management SIM card port etc One base band voltage abnormality would cause the phone cannot power on or cannot download software And the 26MHz and 32 768 KHz would affect the power on or download Because the digit circuit needs the clock signal to work The power management IC supplies the voltages as follows Output S VDDCAMA Sensor analog Sensor IO FM 2 CEN 8 8 8 8 85 5 4 Storage Interface SPI compatible serial bus interface 1 SC6531D is a integrated 32Mbits ROM and 32Mbits RAM 5 5 Audio Interface The audio interface includes MIC bias circuit Earphone bias circuit Earphone ci
11. er normal and then check SPI bus of CPU control the charging Page 11 of 26 Or EN hiss dae Ae me e B BDUTED AS DIFFEFENCE oy 5 9 LCD Interface 1 F120 PCBA screen is 1 8 2 LCD backlight is controlled by SC6531 gt i s i i c a E E a L A E Ya Rp C71 poe sI 18 20 22 23 l cn Bie Ken ESSE Page 12 of 26 6 Power on Procedure 1 Supply Power firstly after PMU of SC6531 has V BAT it supplies 1 1V voltage to LDO interior of PMU and supplies VRTC 1 8V to RTC of CPU When CPU received the VRTC 32 768K clock crystal and RTC begin to work PMU and CPU will be idle status 2 After press POWERON KEY PMU and CPU receive the power on signal and PMU supplies VCORE CPU supply power 1 1V VDD18 IO NAND LCM power 1 8V VDD28 IO NAND LCM power 2 8V VSIM 3V flash supply power Meanwhile VCORE VDD and VMEM supply power to CPU VSIM supply power to SIM card 3 After CPU receive the signal and power supply it output a control signal VCXO EN to PMU and IC When PMU receive VCXO EN it send signal to PMIC and then PMIC control 26M crystal and supply benchmark clock to base band circuit through IC 4 After 26M crystal work steadily CPU and PMU begin to reset 5 After CPU reset read the basic information of power on from ROM and check the connection through the special key press KEYINO KEYOUTO If this key is pressed it would begin to download otherwise CPU execute the R
12. rcuit Receiver circuit Speaker circuit The MIC need bias circuit and the bias circuit is supplied by CPU and the driver of the receiver also supplied by CPU directly So the exterior equipment is simple only physics connected The speaker shared with ring tone MP3 and hand free so use the audio amplifier to output big power But the speaker now is used the internal audio PA the exterior equipment is also simple only physics connected 5 6 SIM Interface The phone compatibles with 1 8V 3V SIM card and the MCU read write it through dual serial bus Page 9 of 26 SIM CARD1 SIM CARD Fig Dual SIM cards Interface 5 Keypad Interface The key part is made on the PCBA Page 10 of 26 a A POWER KEY C CC L LEXPLO_ ESE CEXPAD_ ESS CEXPAO_ ESS i t S LE LE E aE T LEXPLD Bee LESPLD ESS 1 Sale Sets CEXPAD_ ESS CEPO ESS Fig Keypad Interface 5 8 Charging Circuit The phone support charging under Power on off status 1 Check charger al EEPO ESS 3614 LEEFLD Bee 5504 CEXPLO_ ESS er nr S05 CEXPAD_ ESS CEXPAD_553_1 When plugged in the charger the voltage through D2 of U100 to power manager 2 Check charging voltage After CPU checked the charger read the voltage value and send to CPU to check 3 Check battery SC6531 check the voltage of the battery and CPU read the register to receive the information of the battery 4 Control charging After check the charg
13. ty please do not touch it by hand at the best and the iron and instrument must be grounded Please refer to the notice on every instrument 2 2 Equipments Notices Please refer to the user guides of the equipments 3 Test Tools amp Setup 3 1 Test Tools Wireless general purpose tester such as CMD55 Agilent8960 CMU200 Signal source Stroboscope HP high frequency test probe Oscillograph Digital Power Multimeter Clamping Level translation board or USB translation cable 3 2 Tool Settings Supply an external power connect VBAT 3 8V DC 1 0A use the digital power best to view the changes Please refer to the user guides of the equipments Page 5 of 26 4 PCBA 4 1 Top Side EI o Lpa L PAR YO 45154 En e 1P106 ott TPSC b i FIZOMB_V1 0_ 701303276 gt o Z RL 5604 0 S622 e s m 620 S60 m 5603 i 5618 5613 s S612 5617 Page 6 of 26 4 2 Bottom Side 5 Base Band Elements amp Circuit Analysis The main module includes all the functions LCD display Speaker Keypad T flash card Camera charging etc Page 7 of 26 5 1 SC6531 Typical Application y sel ETTR HT i AN H Tr B FO SC6531 is a highly integrated single chip with embedded baseband PSRAM and RF transceiver for GSM GPRS applications which is designed to provide a cost effective low power and high performance solution for mobile phones SC6531 consists of an embedded 32 bit microcontroll
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