A67 SERVICE MANUAL
Contents
1. 7 re solder the CPU or change it 3 CANOT CHARGING Close to 0 19 ae tT ER should afford 14 curren 3 1 CHARGING DIAGRAM 1 Use a fresh USB data cable or charger 2 re solder the IO connector 3 check the charging diagram to verify it is shorted with grounding or not 4 Check the solder quality of the VCHG of CPU re solder the CPU or change it 4 LCD display fail It might be soldering quality of EMI filter or LCD 4 1 LCD DIAGRAM 1 re solder the LCD or change it 2 check the LCD diagram to verify it is shorted with grounding or not 3 re solder the EMI filter or change it 4 re solder the CPU or change it 5 TP is not working It might be assembly quality of TP or the FPC got broken lan sel sr Da THe SBS es ML EP TRE BEN iii Se a wW Li EP Be Rp th So Ge anen Sed E east te Gen ees Aa San cee Ta 5 1 TP DIAGRAM 1 check the TP 2 check the TP connection 3 check the TP diagram to verify it is shorted with grounding or not 4 Check the FPC is connected with PCBA or not 6 the LCD canot lighten up There is 2 type of backlight driver IC CPU and other 6 1 LCD BACKLIGHT DIAGRAM 1 re solder the LCD or change it 2 check the LCD diagram to verify it is shorted with grounding or not 3 If some LED was not working please check the Rs is cut off or not 4 re solder the CPU or change it 7 canot detect the SIM CARD 7 1 SIM DIAGRAM 1 check the connection of SIM card or change2. a fresh Sim card to verify it 2 Check soldering quality of the SIM connector 3 check the SIM diagram to verify whether component is shorted with grounding the component missed or opened 4 If there was a signal of output please flash the SW 5 Re solder the CPU or change it 8 canot detect the TF card 8 1 T card DIAGRAM 1 checking the connection of TF card or use a fresh TF card to verify it 2 Check the soldering quality of TF slot 3 check the TF diagram to verify it is shorted with grounding or not 4 If there was a signal of output please flash the SW 5 Re solder the CPU or change it 9 Camera is not working The Camera got fail or the soldering quality of camera is poor 9 1 CAMERA DIAGRAM 1 re solder the camera or change it 2 check the Camera diagram to verify it is shorted with grounding or not 3 If there was a signal of output please flash the SW 4 Re solder the CPU or change it 10 Mic is not working 10 1 MIC DIAGRAM 1 MIC re solder the MIC or change it 2 check the MIC diagram to verify it is shorted with grounding or not 3 Re solder the CPU or change it 11 receiver is not working 11 1 Receiver DIAGRAM 1 Assembly the receiver or change it 2 Check the REC diagram to verify it is shorted with grounding or not 3 Re solder the CPU or change it 12 SPK not working 12 1 Speaker Hg El re assembly the SPK or change it flash the SW check the SPK diagram to veri
3. A67 SERVICE MANUAL Charging IC TP connector Earphone Jack CPU DBB 2 AA ak NE pm CPU ABB T CARD SLOT Light sensor A DINI In 3 1 Canot download flash SW It might be the poor quality soldering of IO Connector or CPU so you should check the soldering quality of PCBA first then check the diagram as below l use a fresh cable 2 check the I O connector and its soldering quality 3 re solder the IO connector 4 re solder the 32K crystal or change it 5 re solder the 26M crystal or change it 6 re solder the flash or change it 7 re solder the CPU or change it 8 Checking other function diagram 2 Canot power on Check the positive and negative terminals of the PCBA to verify it is shorted or not then power on the handset with DC to verify its current is correct or not then check the PWR is opened or not Re flash the SW if the current is always 50mA check the solder quality of 26M crystal or RF Transceiver if the current is always 10mA 1 Check the battery connector to verify it 1s shorted or not then power on the handset with DC to verify its current is correct or not 2 Re flash the SW check the DM DP U1TXD is shorted with ground or not 3 check the current is correct or not check the LDO VBAT is shorted with ground or not 4 check the visible component is shorted with ground or not 5 re solder the 32K crystal or change it 6 re solder the 26M crystal or change it
4. er the CPU or change it 17 WIFI not working 17 1 WIFI DIAGRAM 1 flash the SW 2 Check the Voltage of VDDWIFIO 3V3 VDDWIFII 1V2 VDDSDI 3 Check the WIFI diagram to verify it is shorted with grounding or not 4 Check the diagram of WIFI antenna 5 re solder the IC or change it 6 re solder the CPU or change it 18 GSM communication not working 18 1 GSM communication diagram 1 flash the SW 2 Check the voltage of VDDRFO VBAT 3 Check the GSM communication diagram to verify it is shorted with grounding or not 4 Check the diagram of GSM antenna 5 re solder the IC or change it
5. fy it is shorted with grounding or not Re solder the CPU or change it 13 Handsfree not working Kos gi Okay Ae pi On tan Le LE Ce A sr HEAD PR D te ae SS Gee hp ee eee Mn Res A 7 AF A SE En ee DUR _ MS Lo QU Ae ee ee aa SS Hp D HEADMIC IN pig g tn IN pp gg Taine i MAN Ps LE P L AUDIO 1 13 1 Handsfree DIAGRAM 1 use a fresh handsfree to verify it 2 check the soldering quality of handsfree connector 3 check the output signal of hansfree 4 check the hansfree diagram to verify it is shorted with grounding or not 5 re solder the CPU or change it 14 G SENSOR sensor not working 14 1 G SENSOR DIAGRAM 1 flash the SW 2 Checking the voltage of VDD28 and VDDIO 3 Check the G sensor diagram to verify it is shorted with grounding or not 4 re solder the IC of G sensor or change it 5 Re solder the CPU or change it 15 light sensor not working 15 1 LIGHT SENSOR DIAGRAM 1 flash the SW 2 Check the voltage of VDD28 and VDDIO VBAT 3 Check the light sensor diagram to verify it is shorted with grounding or not 4 re solder the IC of LIGHT sensor or change it 5 Re solder the CPU or change it 16 the Bluetooth or FM not working BlueTooth 16 1 BT DIAGRAM 1 flash the SW 2 Check the voltage of VBAT 3 Check the BT FM diagram to verify it is shorted with grounding or not 4 Check the diagram of BT FM antenna 5 re solder the IC or change it 6 re sold
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