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Summary of Contents for Micromax Q452
- Page 1 Q452 L3 Service Manual...
- Page 2 1：Technical Specifications Particular Remarks Key Matrix For Flashing Chipset MT6737 Android Version Android M Frequency Quad Core, 1.1GHz LTE CAT4 Network Mode 850MHz/900MHz/1800MHz/1900MHz 3G Band B1,B8,B5 4G Band B3,B7,B8 Internal SD Card memory 10.8G Expandable Memory Factory mode code Press Vol-/ power key at the same time Good Earpiece volume 32Ω±...
- Page 3 3. L3 Service Manual Main camera Receiver P-Sensor connector Connector Connector ( U1703) （SC4/SC5） （J1804） (J1501) XTAL （Y801） BT/WIFI/GPS/ ( U1300) RF IC Flash （U800） （U401） （） RF 2G PA （U1200） Backlight driver Power IC 3/4G PA （） （U400） (U1401) (U601)
- Page 4 Earphone Front Camera Connector connector connector (J1601） (J1402) (J1500) WIFI/BT/GPS 4G NET (E1300/E1301) (E1101/E1102 Flashlight Switch driver charge IC (U1502) (U1802) Flashlight (D1502) connector (J1800) connector Side KEY (J1801) connector (J703) G-Sensor (U1700) Audio PA Battery T-Flash Connector (U1600) connector connector (J800) (J1802)
- Page 5 Check the I/O connector soldering quality, if not , Re-sold it or change it. Check the CPU work normally or not. Re-Solder the CPU or change it Connector Flash...
- Page 6 2. No power on Solution: Flash the handset with latest SW Check the battery have capacity or not ,if not ,Change it Charging with transferred to 4.0 V dc power supply to the mainboard on battery Re-soldering ,check The mainboard work current, the normal starting current will be from 100 ma jump to light screen ...
- Page 7 3. Not charging: Solution: Flash the handset with latest SW Plug in the charger to check whether the machine has a charging icon, if don’t have, then check the 5V power pin of USB port connect the mainboard or not ...
- Page 8 Switch connector Charging IC switch IC Power IC...
- Page 9 4. LCD / Display problem: Solution: Flash the handset with latest SW Check the connect ribbon cable saddle normally or not , Re-assembly LCD. Check the LCD connector work normally or not, Re-Solder LCD connector or change it ...
- Page 10 5. Touch panel is not working Flash the handset with latest SW Check the connect ribbon cable saddle normally or not , Re-assembly TP. Check the TP connector work normally or not, Re-Solder TP connector or change it ...
- Page 11 6. LCD backlight not on or dark Solution: Flash the handset with latest SW Check the connect ribbon cable saddle normally or not , Re-assembly LCD. Check the LCD connector work normally or not, Re-Solder LCD connector or change it ...
- Page 12 7. SIM not detecting: Solution: Flash the handset with latest SW Check if the SIM card is obviously damaged, if yes, Replace the SIM card socket Check if the ground impedance of each pin of the SIM card socket(except the ground pin)is low(lower than grade ),if yes, Replace the resistor of the corresponding pin;...
- Page 13 8. SD card not detecting: Solution: Flash the handset with latest SW Check if the TF card is obviously damaged, if yes, Re-Solder TF connector or change it Check if the ground impedance of each pin of the TF card socket(except the ground pin)is low(lower than grade ),if yes, Replace the resistor of the corresponding pin;...
- Page 14 9. Front camera is not working: Solution: Flash the handset with latest SW Check if the Camera is obviously damaged, if yes, Replace the Camera ; Check if the ground impedance of each pin of the Camera connector (except the ground pin)is low(lower than grade ),if yes, Replace the resistor of the corresponding pin;...
- Page 15 10. Rear camera is not working: Solution: Flash the handset with latest SW Check if the Camera is obviously damaged, if yes, Replace the Camera ; Check if the ground impedance of each pin of the Camera connector (except the ground pin)is low(lower than grade ),if yes, Replace the resistor of the corresponding pin;...
- Page 16 Camera connector...
- Page 17 11. MIC no sound: Solution: Flash the handset with latest SW Check the MIC bad or not. then Re-Solder MIC or change it Check the connection of main board and vice board normally or not. Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work ...
- Page 18 12. Receiver not working: Solution: Flash the handset with latest SW Check the receiver bad or not, then change it. Check the receiver circuit normally or not.
- Page 19 Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work Check the Power IC work normally or not. Re-Solder the Power IC or change it Check the CPU normally or not, then Re-Solder CPU or change it. Receiver Slot Power IC...
- Page 20 LCD/SPK FPC Connector Power IC FPC connector SPK Slot...
- Page 21 14. Earphone not working: Solution Flash the handset with latest SW Check the earphone normally or not, then change it; Check the earphone connector normally or not. then Re-Solder earphone connector or change it Check the Power IC normally or not, then Re-Solder Power IC or change it. ...
- Page 22 15. G SENSOR not working: Solution: Flash the handset with latest SW Check the g-sensor work normally or not, Re-solder or change it Check the CPU work normally or not, Re-Solder CPU or change it G-Sensor...
- Page 23 16. FM not working: Solution: Flash the handset with latest SW Check the earphone normally or not, then change it; Check the first pin of earphone, well connect with earphone line or not. then Re-Solder earphone connector or change it ...
- Page 24 17. WI-FI is not working properly: Solution: Check WIFI 11 to 30 S if these are working fine。 Flash the handset with latest SW Check the WIFI antenna normally or not, then Re-Solder or change it. Check the WIFI chip work normally or not, then Re-Solder CPU or change it. ...
- Page 25 18. BT is not working fine: Solution: Check BT 11 to 30 S if these are working fine。 Flash the handset with latest SW Check the BT antenna normally or not, then Re-Solder or change it. Check the BT chip work normally or not, then Re-Solder CPU or change it ...
- Page 26 19. Keys are not working: Solution: Flash the handset with latest SW Check if the keys FPC normally or not, Re-Solder Side key or change it Check the circuit from keys to CPU normally or not ,then Re-Solder CPU or change it Side key Slot...
- Page 27 20. Reset is not working: N/A 21. Vibrator is not working: Solution: Flash the handset with latest SW Check if the vibrator is failure then Re-Solder Vibrator or change it Check the Main FPC Assembly Quality ,if not ,Re-Assembly it or change it. ...
- Page 28 22. Proximity sensor is not working Solution: Flash the handset with latest SW Check the Proximity sensor normally or not ,Re-Solder Proximity sensor or change it. Check the Power IC work normally or not, Re-Solder Power IC or change it ...
- Page 29 23.GPS cannot locate and open: Solution: Check BT 11 to 30 S if these are working fine。 Flash the handset with latest SW Check the GPS antenna normally or not, then Re-Solder or change it. Check the WIFI&BT&GPS&FM IC normally or not, then Re-Solder CPU or change it. ...
- Page 30 24. Network issue: Solution: Flash the handset with latest SW Check the RF Antenna Slot soldering quality, if not, Re-sold it or change it. Check the RF coaxial line normally or not. Re- Assembly it or change it. ...
- Page 31 Thanks...