1. Manuals
  2. Brands
  3. Micromax Manuals
  4. Cell Phone
  5. Q427+
  6. Service manual

Micromax Q427+ Service Manual

Hide thumbs Also See for Q427+:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Service Manual
Q427+
1：Technical Specifications
Particular
Key Matrix For Flashing
Chipset
Android Version
Frequency
Network Mode
Data Segment
Rom
RAM
Internal SD Card memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Good Mic volume
Good Vibrator volume
Remarks
NA
MT6735P
Android 6.0
1.3GHz
2G: 8
0MHz/900MHz/1800MHz/1900MHz
5
3G: B1 B8
GPRS, EDGE, HSPA+ 21Mbps, FDD-LTE, TDD-LTE
16G
2G
12G
64G
Press vol+/ Vol-/ power key at the same time
32Ω± 15%
8Ω± 5%
2.2kΩ± 5%
30Ω± 5%
L2 Service Manual

Advertisement

Table of Contents
loading

Related Manuals for Micromax Q427+

Summary of Contents for Micromax Q427+

  • Page 1 Q427+ L2 Service Manual 1：Technical Specifications Particular Remarks Key Matrix For Flashing Chipset MT6735P Android Version Android 6.0 Frequency 1.3GHz 2G: 8 0MHz/900MHz/1800MHz/1900MHz Network Mode 3G: B1 B8 Data Segment GPRS, EDGE, HSPA+ 21Mbps, FDD-LTE, TDD-LTE Internal SD Card memory Expandable Memory Press vol+/ Vol-/ power key at the same time Factory mode code...
  • Page 2 Q427+ L2 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+ L2 Service Manual 1. Does not power on S.NO Possible Cause Validation steps Action Replace PCB if found Shorting Check shorting with Multi meter faulty a) Clean the 3 or 4 golden color point(its terminals)on the battery Battery Replace if found faulty b) Check voltage with Multi meter Value must be 3.7V DC or above a) Check battery connector...
  • Page 4 Q427+ L2 Service Manual 2：Display issue/No display S.NO Possible Cause Validation steps Action SW issue Flash the handset with latest SW LCD issue Re-assembly LCD/Replace it No display PCBA issue Re-assembly PCBA/Replace it PCBA issue Re-Solder the LCD connector or change it Colored screen LCD issue Re-assembly LCD/Replace it...

  • Page 5: Touch Panel

    Q427+ L2 Service Manual 3：Touch panel S.NO Possible Cause Validation steps Action SW Issue Flash the handset with latest SW TP issue Re-assembly TP/Replace it TP not working PCBA issue Refer to L3 repair PCBA issue Re-Solder the TP connector or change it TP issue Re-assembly TP/Replace it TP not working proper...

  • Page 6: Proximity Sensor

    Q427+ L2 Service Manual 4：Proximity Sensor S.NO Possible Cause Validation steps Action SW Issue Flash the handset with latest SW Sensor holder is not Proximity sensor fail Re-assemble the sensor holder assembled well PCBA issue Change PCBA Proximity sensor 5：G-sensor S.NO Possible Cause Validation steps...
  • Page 7 Q427+ L2 Service Manual 6： Keys S.NO Possible Cause Validation steps Action Key is fail Change Key Key is not response SW Issue Flash the handset with latest SW soldering Quality Solder Key again The feeling of pressing Some dust with dome Clean it key is bad Key is not assembled well...
  • Page 8 Q427+ L2 Service Manual 7：Charging S.NO Possible Cause Validation steps Action Adapter is fail Change adapter Cable is fail Change Cable Cannot charge into Battery is issue Charging or Change it Main FPC issue Re-assembly or Change it I/O connector is fail Re-Solder or Change it SW Issue Flash the handset with latest SW...
  • Page 9 Q427+ L2 Service Manual 8：USB S.NO Possible Cause Validation steps Action USB cable is fail Change USB cable I/O connector fail Re-Solder or Change it Cannot connect to PC Main FPC issue Re-assembly or Change it PCBA fail Change PCBA connector Cable Main...

  • Page 10: Front Camera

    Q427+ L2 Service Manual 9：Front Camera S.NO Possible Cause Validation steps Action Camera is issue Re-assembly camera or Change it Colored screen when open front camera PCBA fail Change PCBA SW issue Flash the handset with latest SW Camera issue Re-assembly or Change it Cannot turn on Rear camera...

  • Page 11: Rear Camera

    Q427+ L2 Service Manual 10：Rear Camera S.NO Possible Cause Validation steps Action Camera is fail Re-assembly or Change it Colored screen when open front camera PCBA fail Change PCBA SW issue Flash the handset with latest SW Camera fail Re-assembly or Change it Cannot turn on Rear camera Camera issue...
  • Page 12 Q427+ L2 Service Manual 12：Vibrator S.NO Possible Cause Validation steps Action Vibrate assemble issue Re assemble it Vibrating is not properly SW issue Flash the handset with latest SW Main FPC issue Re-assembly Main FPC or change it. Soldering issue Re soldering it PCBA issue Re soldering FPC connector or change it...
  • Page 13 Q427+ L2 Service Manual 14：RF Network S.NO Possible Cause Validation steps Action SW issue Flash the handset with latest SW RF antenna issue Re-assemble or Change it SIM socket is fail Re-Solder or Change it RF Network cannot Some dust with RF Slot Clean it searchable RF Coaxial line issue...
  • Page 14 Q427+ L2 Service Manual 15： FM S.NO Possible Cause Validation steps Action SW issue Flash the handset with latest SW Earphone is fail Change Earphone Cannot turn on FM FM antenna fail Re- Solder or Change earphone connector PCBA fail Change PCBA Earphone connector...
  • Page 15 Q427+ L2 Service Manual 16: Receiver S.NO Possible Cause Validation steps Action Dust with receiver Clean it Noise/crack Receiver issue Re-assemble or Change it SW issue Flash the handset with latest SW Receiver is set too low by Noise/volume low Reset the value of volume person PCBA issue...
  • Page 16 Q427+ L2 Service Manual 17：Earphone S.NO Possible Cause Validation steps Action SW issue Upgrade the handset with latest SW Earphone is fail Change Earphone Not working / from earphone PCBA issue Refer to L3 service Earphone connector Re-Solder or Change it having poor soldering Earphone connector...
  • Page 17 Q427+ L2 Service Manual 18：MIC S.NO Possible Cause Validation steps Action Some dust with MIC Clean it MIC issue Re-assemble or Change Main FPC Noise with uplink side Re- Solder or Change Main FPC MIC issue connector PCBA issue Refer to L3 repair soldering issue Re-Solder or Change it Volume low...
  • Page 18 Q427+ L2 Service Manual 19: GPS S.NO Possible Cause Validation steps Action SW issue Flash the handset with latest SW Set GPS turn off as default Reset GPS to turn on GPS GPS not connecting GPS antenna issue Re-assemble or Change GPS antenna PCBA issue Refer to L3 service Antenna...
  • Page 19 Q427+ L2 Service Manual 20: Speaker S.NO Possible Cause Validation steps Action Speaker with dust Clean speaker Noise/crack Speaker foam issue Re-assemble or Change SPK Speaker issue Change speaker Assemble issue Assemble again SW issue Flash the handset with latest SW Speaker issue Re-assemble or Change Main FPC No volume...
  • Page 20 Q427+ L2 Service Manual 21：Battery S.NO Possible Cause Validation steps Action Battery issue Change battery Show charging but it is not charged Charging connector issue Re-Solder or Change it No charging PCBA issue Re-assemble or Change PCBA PCBA issue Refer to L3 repair Some dust with Battery golden color Clean golden color point point...

Table of Contents