201503171608490.Pride 369-Pride 370
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1. Over 20 3 5 2 send voice Detail The other side people can t hear your voice B Analysis The MIC connect badly or broken There are some problems in MIC circuit n Repair Can t send voice Dose MIC connected well Is MIC Replace it Is R212 R217 C222 C227 B201 B202 R213 R209 ok Replace BB 21 3 6 Power on failure Detail Mobile can t power on Analysis The 26M crystal is broken The power on off key dome is broken The baseband or flash chip is broken n Repair Power on failure Big current i 3 Find short current point Is VDD VCORE VM VTCXO ok Power supply problem Replace BB 26M crystal ok Replace them Download again Over 22 3 7 Download failure B Detail Can t download code to mobile B Analysis The 26M crystal is broken The power on off key dome is broken The baseband or flash chip is broken n Repair Download failure Is VDD VCORE VIO Power supply problem VM VTCXO ok Replace BB 26M crystal ok Replace X601 Replace BB Download again Over 23 3 8 Detect failure B Detail The mobile can t detect plugging in and out of earphone Analysis The baseband chip can t receive interrupt signal n Repair Detect earphone failure Is 4205 connected well Replace J204 Are R211 R201 R207 B208 Repl2. 9 FAIL AND ADC SLOPETAIL 4 4 rete eere 25 5 10 FROUBLESHOOTING QN GO PER ee FER 25 S IE BLUETOOTH TROUBLESHOOTING EORR lates EUR EGRE E ee ON 28 3 12 TROUBLESHOOTING reete hike een ge eee te ehe 29 1 Product Characteristic 1 1 Overview M810C is dual frequency mobile main board It supports 1 77 128 160 and 2 0 176 220 LCD module digital camera and MMS module 64 chord ring MP3 USB and many kinds of useful functions multi language input phone note ck alarm clock calculator games FM radio Bluetooth 1 2 Functions M810C main board system overview 97mm 3 6mm GSM900 DCS1800 dual frequency mode Supports 2 0 2 4 LCD module Supports digital camera Supports MP3 music Supports MPEG4 format movies Extensible Memory T FLASH Supports longtime sound record Earphone connector Electric torch Supports MMS 64 chord ring Short message Many games integration Rings volume desktop individuation setup 1 4 Main board placement M810C MB Bottom Ear phone connector SIM Card LCD M810C_MB_TOP MIC 2 Circuit 2 1 System Overview MT6261M is a feature rich and extremely powerful single chip solution for high end GSM GPRS capability Based on 32 bit ARM7EJ STM RISC processor MT6261M 5 superb processing power along with high bandwidth architecture and dedicated hardware support provid
3. 01 C708 c709 L 704 L705 R705 and the ANT ok N gt Replace them 15 BB IC Replace or re solder it 28 3 12 FM Troubleshooting B Detail FM Fail m Analysis Are BBIC and the ant OK 1 Earphone FM Fail Earphone connected ok N Replace or re solder Are R237 B211 ok N Replace or re solder Replace 29 EZ FM Fail GSM antenna N Replace or re solder connected well Are U701 and the around components OK N Replace or re solder Replace BB Over 30
4. M810C Service Manual Document Type Maintenance Training Document Name M810C Service Manual Version 1 0 Date 2014 11 07 1 PRODUCT 3 Ds OVERVIEW EC E 3 LED FUNCTIONS GG AR ERE RO ON IS E MY EMEN AIR A DERE 3 1 3 TECBNOBOGYDEPAIDS E ER ERA te d Et Hin 1 4 MAIN BOARD PLACEMENT 4 2 5 2 SYSTEM OVERVIEW ode D rU osito 5 2 2 AUDIO CIRCUIT rt e pp itr deret terat a ORE RE p reme 7 2 3 LCD CODE 9 2 4 BATTERY AND CHARGER T ERO e ER ee PU rop Mens 9 2 9 REMODULE beet eret e east dated m 10 2 6 BEUETOOTH AND EM ess cete 12 3 TROUBLESHOOTING 13 3S4 LEGD MODUEE iti e eri ER Rt E rmt im terere eris 13 3 2 RING AND VIBRATOR 15 CHARGE CIRGUIT P DRE 17 SAL KEYPAD AND BACK LIGHT eicere teer teneret ee eee Peer mr eeu rato 18 RIS aC Em 20 3 6 POWER ON FAILURE DRE SRO EET TREE 22 3 DOWNLOAD ease PU 23 3 8 DETECT EARPHONE FAILURE RE REOR RERO Reis 24 3
5. ace them Solder joint ae Replace BB Over 3 9 ADC FAIL ADC SLOPE FAIL Detail ADC calibration fails B Analysis The baseband chip is broken n Repair Re solder or replace baseband chip 3 10 RF Troubleshooting 3 10 1 Calibration A AFC calibration Fail B Detail AFC calibration Fail Analysis RF test line connects badly The crystal and components beside are broken or cold solder joint n Repair AFC calibration Fail Dose RF line connected well Is crystal in reverse Replace or re solder Replace U603 25 path loss B Detail Rx path loss calibration Fail B Analysis RF test line connects badly There are some problems in the components at RX channel Repair Rx path loss Are RF test port J60 and the RF ant connected well Are U603 and path component OK Replace or re solder BB 26 Detail calibration Fail Analysis RF test line connects badly PA is in reverse There are some problems in the components at PA and components beside n Repair APC Fail Are RF test port P601 and the RF ant connected well Are U603 and RX path component OK Replace or re solder BB 27 3 11 Bluetooth Troubleshooting Detail Bluetooth Fail Analysis Is Bluetooth ant connected ok Is 0101 n Repair APC Fail The voice is abnormal BT Can not open Are C7
6. and FM circuit If need better performance please use MTK qualified bandpass filter 7 4 Ji please refer to design note 223 27 J ira i L701 1702 704 FRUI 4TnH 33nH Il 703 L703 ATnF 9701 Re IN en H gt gt GPIOM FM p eno GND2 mE 1 4 5 8 1 vop our H 715 57177 C707 Il 47nF__SFM_ANT_GSM SFM_ANT_GSM HKALE Tu FM R231 247nF LANT P1 B ANTP lt lt B211 ANT GSM lt lt 82nH 4205 4 R 20 1 8 100 XMP3 20 0 L BB B208v A1K8 100M XMIC IN 2 0 05382 0101 to T222 12 3 troubleshooting 3 1 LCD module 3 1 1 No display Detail no display B Analysis LCM FPC is broken LCM is broken n Repair No display Is LCD FPC Re solder Replace DSP chip OK Replace BB chip OK BERN 3 1 2 back light failure Detail LCM back light failure B Repair LCM back light failure Is LCD FPC Re solder Replace chip 14 3 2 3 2 1 B Detail vibrator doesn t work Repair Vibrate failure Is Vibrate ok Dose it connect Ok C411 joint Is sol
7. der Replace BB chip 3 2 2 No ring Detail no ring Analysis speaker connects failure n Repair no ring Is speaker connected well Replace one Replace R202 R203 T206 T207 T208 T209 Replace BB 16 3 3 Charge circuit 3 3 1 No charge message Detail no charge message after charger 5 plugging Analysis Is the charger OK Is the battery OK The charge circuit is abnormal n Repair No charge message Replace charger Replace Battery Is R440 R411 R414 R410 U403 OK Replace BB 17 3 4 Keypad back light 3 4 1 Press failure B Detail press failure B Analysis The dome is broken The side key is short circuit n Repair Press failure Is dome ok dome replace one Clean Is side key short circuit Replace BB Over 18 3 4 2 Keypad back light off B Detail The keypad back light is always off B Analysis LEDs are broken The current control resistance is cold solder joint n Repair Keypad back light off replace R216 Replace BB Over 19 3 5 Calling 3 5 1 Can t hear voice Detail t hear voice when calling Analysis The receiver connect badly or broken n Repair Can t hear voice Dose receiver connected well K Is receiver OK Replace it OK Is C208 C209 T228 T229 OK them OK Replace BB K BEEN
8. es a platform for high performance GPRS Class 12 MODEM application and leading edge multimedia applications L EIE EIE TTAG L ARMTEIS Memory l Boot rtf weg co CODEC Control Image DMA E DES Memory AFE Interrupt Controller Voice The power management unit manages the power supply of the entire chip such as baseband processor memory SIM cards camera vibrator etc The digital part of PMU is integrated into the analog part see the figure below PMU includes the following analog functions for signal processing 2G RF Transceiver on chip There are three types of LDOs in PMU of MT6261A PMU The analog LDO is optimized for low frequency ripple rejection in order to reject the ripples coming from the burst of RF power amplifier The digital IO LDO is a linear regulator optimized for very low quiescent current The single step RTC LDO is a linear regulator that can charge up a capacitor type backup coin cell which also supplies the RTC module even at the absence of the main battery The single step LDO features reverse current protection and is optimized for ultra low quiescent current while sustaining the RTC function as long as possible Volto Description S Mcad 1 Dis 9 Dg Vibrator 39 Memoysad VSF RTCLDO VRTE 2 2 AUDIO ci
9. rcuit Speaker 41 SPKPO lt lt 4 SPKNO lt lt 8 as zl mm 9 4 5 AU_OUTO_P gt 14 5 4 5 AU_OUTO_N gt lt 4 5 SFI0402 050E Spe SFI0402 050E SINE R212 1K MICBIASP_N 4 4 100nF C201 4 TuF 0503 MICROPHONE lt lt C227 1 00 T220 SFI0402 050E3 SFI0402 050E330NP MICBIASP R209 1K m KRESS gu RE Psi Aprea nh a nb 4 np ES Mi 2 3 LCD module mode 1 77QQVGA 2 0 QICF Resolution 128 160 176 220 Dot m Back light mode Write LED 4 ISINKO lt lt 1 3 4 4 I 8 L bA S 7 8 n lt lt 1 LSCEB 44 1 LSAO 12 1 LSCK 13 1 LSDA __ 14 xc M LSRSTB lt lt T 16 x 17 Y 18 19 2 4 Battery and charger 1 Battery The Li on battery is advised Spin Dimension and capacity is decided by mechanism solution 2 Charge process The switch charger is recommended for 533 with USB cable can be used too The charge process is optimized for Li on battery specially that include pre charge constant current charge and constant voltage mode It can protect battery and extend usage life of ba
10. ttery 7 Charging path trace width 411 from VCHG to battery connector CHRIN max 8 07 when 0290 NC Cap power rating depends on i R410 requirement 04037 TuF 4 g C419 1200 Power rating gt 30V ISENSE 4mil R411 0220805 1 1 BATSNS 40mil J402 1 1 2 5 8 2 2 2405 4 1 2 5 6 2 TMP_TST NC 03463 1002 ps 2 5 RF module Transceiver RF7170DS The RF7170D is a dual band EGSM900 DCS1800 GSM GPRS Class 12 compliant transmit module with two symmetrical receive ports This transmit module builds upon RFMD s leading power amplifier with PowerStar integrated power control technology pEMT switch technology and integrated transmit filtering for best in class harmonic performance The results are high performance reduced solution size and ease of implementation The device is designed for use as the final portion of the transmitter section in EGSM900 DCS1800 handset and eliminates the need for a PA to antenna switch module matching network The device provides 50 matched input and output ports requiring no external matching components 10 EGSM900 gt e RX ADC RX Calibration Predistortion Gaussian Loop ES SX Calibration Engine DCS1800 le E TXO LB TX TXO HB ES M810C RF circuit 2 6 Bluetooth and M810C Bluetooth
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