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DASH 3.5

SERVICE MANUAL

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Summary of Contents for DASH 3.5

Page 1: ...DASH 3 5 SERVICE MANUAL...

Page 2: ...a wrist strap when exchange system boards When repairs are made to a system board they should spread the floor with anti static mat which is also grounded Use a suitable grounded soldering iron Keep s...

Page 3: ...it 11 2 6 RF circuit 11 3 Trouble Shooting 12 3 1 Fail to startup power on 12 3 2 Fail to charge 13 3 3 Fail to display 14 3 4 Fail to call 15 3 5 Speaker no sound 16 3 6 Earphone fail 17 3 7 Vibrator...

Page 4: ...electrostatic sensitive components on the handset 4 If disassembling operation is necessary for repairing comply with mechanical structure disassembling work instruction Otherwise disassembling opera...

Page 5: ...2 Technology summarize 2 1 Description of main board component map...

Page 6: ......

Page 7: ...2 2 MSM7225A circuit system MSM7225A functional block diagram as following MSM7225A functional system is made of three parts as below...

Page 8: ...225A baseband System Architecture as following Processing features High performance ARM CORTEX A5 800 MHz application processor 1 ARM architecture v7 2 32 KB instruction and 32 KB data cache 3 256 KB...

Page 9: ...2 such as LCD panels Enhanced EBI1 memory support 200 MHz bus clock for DDR SDRAM EBI2 support 1 1 8V memory interface support 2 Support for EBI2 A D mixed mode 3 NAND flash memory interface 4 Support...

Page 10: ...ions 19 2 MHz and 2 4 MHz 19 2 MHz crystal oscillator for system timing 32 768 KHz crystal oscillator and real time clock with alarm and coin cell backup Eleven configurable GPIO pins and eight MPPs V...

Page 11: ...ed BT FM function Standalone BT 1 2 4 GHz BT transceiver 2 BT baseband processor 3 Compliant with BT core specification version 4 0 BR EDR BLE Standalone FM radio 1 FM transmitter receiver 2 FM baseba...

Page 12: ...on modes 3 Trouble Shooting 3 1 Fail to startup power on The following conditions may cause boot fail battery low battery connector is damaged or bad welding components bad weld short circuit or damag...

Page 13: ...power key Y Check each power N Re solder or out of PMU replace U1001 Y Re download Y Software OK N Resold or replace Y U502 OK N Y Resold or replace OK U0401 3 2 Fail to charge Check charging circuit...

Page 14: ...one N Change T1710 or C1802 N Change related component N Hot or change U1001 First use DC power supply to start up check the board whether power on normal ensure main board can power on normal Second...

Page 15: ...r what we say This fail may cause by receiver or microphone fail it can test in factory mode type 7 enter factory mode Transmitter Receiver test if ok it may RF fail if fail we need to make sure is re...

Page 16: ...N Check RF MIC Check Receiver Receiver or MIC Y Y Change a Change Change Check a new one new MIC new new one N Rework uncorrected N N N Check Check Related Rework Related R C TVS R C TVS uncorrected Y...

Page 17: ...ound Is speaker OK Y Are B1910 B1911 NC or not N Check T1912 T1903 C1929 C1930 and C2001 ok or not Y N Check U1001 N Replace Speaker Y ADD B1910 B1911 N Re solder uncorrected component Hot or change U...

Page 18: ...n earphone Is earphone N connector OK Y Is J601 soldering N well Y Replace earphone Re solder J601 Are All TVS right direction Y Related R C right Y Hot or change U1001 N Re solder uncorrected TVS N R...

Page 19: ...ted R C OK or NOT Check D1201 reverses or not Y Hot U1001 or Change a new one N Change a new Motor N Change uncorrected component OK Side key no function N Is key switch soldering OK Y Is R1469 R1435...

Page 20: ...K Y Check each signal N on SIM is OK 3 10 Failure to flash IMEI Fail to flash IMEI N Could it power on Y Y Could it download N Re solder or N change memory U502 Y OK Clean SIM socket SIM is damaged Re...

Page 21: ...CLK CAM_PCLK MIPI_DATA and MIPI_CLK If signals abnormal check U0401 re hot or change a new one Camera fail Is camera connector soldering well Y Check camera ok or not Y Check AVDD DOVDD ok or not Y Ch...

Page 22: ...ormal Fourth test related signals such as MCCK MCCM0 MCDA0 MCDA1 MCDA3 if abnormal check U0401 re hot or change a new one T F Card is not identified Change a new TF card to test N Check T flash card s...

Page 23: ...4 BGA related GND or no function pad Red no function pad White GND pad 4 1 CPU and memory pin map...

Page 24: ...4 2 PMU pin map...

Page 25: ...4 3 BT FM WIFI pin map...

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