Micromax Q427+ Service Manual
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Also See for Q427+:
- Service manual (20 pages) ,
- Disassembly manual (14 pages) ,
- Assembly manual (12 pages)
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Q427+
1、Technical Specifications
Particular
Key Matrix For Flashing
Chipset
Android Version
Frequency
Network Mode
ROM
RAM
Internal SD Card memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Good MIC volume
Good Vibrator volume
L3 Service Manual
Remarks
NA
MT 6735
Android 6.0
1GHz Quad core
850MHz/900MHz/1800MHz/1900MHz B1,B3,B7,B20
16GB
2GB
12
64G Byte
press Volume+&Volume-&Power
32Ω± 15%
8Ω± 5%
2.2kΩ± 5%
30Ω± 5%
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Summary of Contents for Micromax Q427+
- Page 1 Q427+ L3 Service Manual 1、Technical Specifications Particular Remarks Key Matrix For Flashing Chipset MT 6735 Android Version Android 6.0 Frequency 1GHz Quad core Network Mode 850MHz/900MHz/1800MHz/1900MHz B1,B3,B7,B20 16GB Internal SD Card memory Expandable Memory 64G Byte Factory mode code press Volume+&Volume-&Power Good Earpiece volume 32Ω±...
- Page 2 Q427+ L3 Service Manual 2：CAUTIONS Flashing & Servicing must be undertaken by qualified personnel only. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn. III. Use only approved Tools & components as specified in the parts list. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and alignment Ensure all cables and wires are repositioned correctly if Handset disassembled...
- Page 3 Q427+ L3 Service Manual D1500 J1500 E1101 J1602 Flashlight Camera Connector connector E1301 Wifi/BT ANT J1402 U1706 TP connector Gyro sensor J1801 J1803 T-FLASH connector connector J1800 J1802 J1700 J1804 J1400 Battery connecto connect connect connect connector...
- Page 4 Q427+ L3 Service Manual 1. Unable to load Software: Solution: First check the computer can recognize the device or not, if not, Re-load it. Then check the USB port to master control circuit is normal or not.： format the flash and upgrade again if fail in the Proceed of downloading.
- Page 5 Q427+ L3 Service Manual 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 6 Q427+ L3 Service Manual...
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Page 7: Not Charging
Q427+ L3 Service Manual 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 Q427+ L3 Service Manual...
- Page 9 Q427+ L3 Service Manual 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 Q427+ L3 Service Manual 5. Touch panel is not working N/A 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 Q427+ L3 Service Manual 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 Q427+ L3 Service Manual...
- Page 13 Q427+ L3 Service Manual 7. SIM not detecting: Solution: Flash the handset with latest SW Check the SIM card socket is obviously damaged, if yes, Replace the SIM card socket Check 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 14 Q427+ L3 Service Manual...
- Page 15 Q427+ L3 Service Manual 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 16 Q427+ L3 Service Manual...
- Page 17 Q427+ L3 Service Manual 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 18 Q427+ L3 Service Manual 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 19 Q427+ L3 Service Manual 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. ...
- Page 20 Q427+ L3 Service Manual Power IC connector...
- Page 21 Q427+ L3 Service Manual 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. Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work ...
- Page 22 Q427+ L3 Service Manual 13. Speaker not working: Solution: Flash the handset with latest SW Check the Speaker bad or not, else change it. Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work ...
- Page 23 Q427+ L3 Service Manual connector Power IC 14. Earphone not working: Solution...
- Page 24 Q427+ L3 Service Manual Flash the handset with latest SW Check the earphone normally or not, then change it; Check the earphone jack 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 25 Q427+ L3 Service Manual Check the CPU work normally or not, Re-Solder CPU or change it Sensor 16. FM not working: Solution: Flash the handset with latest SW...
- Page 26 Q427+ L3 Service Manual 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 Check the Power IC normally or not, then Re-Solder Power IC or change it. ...
- Page 27 Q427+ L3 Service Manual 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 BT/WIFI/GPS/FM Chip normally or not, then Re-Solder Power IC or change it. ...
- Page 28 Q427+ L3 Service Manual 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/WIFI/GPS/FM Chip normally or not, then Re-Solder Power IC or change it. ...
- Page 29 Q427+ L3 Service Manual 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 Key FPC 20.Reset is not working: N/A...
- Page 30 Q427+ L3 Service Manual 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 31 Q427+ L3 Service Manual 22. Proximity sensor is not working Solution: Flash the handset with latest SW Check the Proximity sensor normally or not ,if not Re-Solder Proximity sensor or change it. Check the Power IC work normally or not, Re-Solder Power IC or change it...
- Page 32 Q427+ L3 Service Manual Check the CPU work normally or not, Re-Solder CPU or change it Sensor Power IC 23.GPS cannot locate and open: Solution: Check BT 11 to 30 S if these are working fine。 Flash the handset with latest SW ...
- Page 33 Q427+ L3 Service Manual Check the BT/WIFI/GPS/FM Chip normally or not, then Re-Solder Power IC or change it. Check the CPU normally or not, then Re-Solder CPU or change it. WiFi/BT Bt/WiFi/Gps /FM/GPS ANT /FM Chip 24. Network issue: Solution: ...
- Page 34 Q427+ L3 Service Manual Check the RF connector normally or not. Re-sold it or change it Strongly solder 26M Crystal or change it Check the RF PA normally or not, then Re-Solder RF PA or change it. ...
- Page 35 Q427+ L3 Service Manual Thanks For any Query or suggestion, Please write to tech.help@micromaxinfo.com...