Micromax Q427+ User manual

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

ROM

16GB

RAM

2GB

Internal SD Card memory

Expandable Memory

64G Byte

Factory mode code

press Volume+&Volume-&Power

Good Earpiece volume

32Ω± 15%

Good Loudspeaker volume

8Ω± 5%

Good MIC volume

2.2kΩ± 5%

Good Vibrator volume

30Ω± 5%

Q427+ L3 Service Manual

2：CAUTIONS

I. Flashing & Servicing must be undertaken by qualified personnel only.

II. 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.

IV. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and

alignment

V. Ensure all cables and wires are repositioned correctly if Handset disassembled

VI. Electrostatic discharge can easily damage the sensitive components of electronic products.

Therefore, Service Centre must Adhere the precautions which mentioned above.

3. L3 Service Manual

J1601

Earphone

Connector

U601

Power chip

U1703

Proximity

Sensor

U1200

RF sw

J1600

Receiver

Connect

J1501

Main camera

Connector

U1300

GPS/WIFI/F

M/BT chip

U401

Flash

J1200

RF connector

U800

RF chip

U900

3G/4G PA

U400

CPU

Y1300

Crystal

D1700

charge

indicator

U1401

Backlight

Drive

Z1101/Z1102

RF filter

Q427+ L3 Service Manual

J1400

LCD

connector

U1706

Gyro sensor

J1804

FPC

connect

J1801

SIM

connector

J1402

TP connector

J1602

MIC

J1802

Battery

connect

J1803

T-FLASH

connector

D1500

Flashlight

J1700

Key

connect

E1101

connector

E1301

Wifi/BT ANT

J1500

Camera

Connector

J1800

SIM

connecto

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.

Use a new data cable

Check the I/O connector soldering quality, if not, Re-sold it or change it.

Check the Main FPC Assembly quality, if not, Re-Assembly it or change it.

Check the FPC 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

I/O

connector

FPC

connector

Main FPC

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

Enter boot LOGO 400 ma to completely started around 500 ma, if the current not right then check

Whether has short circuit or open circuit phenomenon or not.

Check the Power IC work normally or not ,Re-Solder it or change it

The output voltage normally or not

Check the 26M crystal work normally or not ,Re-Solder it or change it

Check the CPU work normally or not, Re-Solder CPU or change it

26M

crystal

CPU

Power

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

Check the voltage of battery when charging If it reaches 4.2V, has shown in front of the

Transmission, now maybe is the battery bad so that no charging.

Check the I/O connector work well or not ,if not , Re-Solder or change it

Check the Main FPC Assembly Quality , if not ,Re-Assembly it or change it.

Check the FPC connector soldering quality , if not ,Re-sold it or change it.

Check the charging switch work well or not ,if not , Re-Solder or change it

Check the Power IC work normally or not, Re-Solder CPU or change it

Check the CPU work normally or not. Re-Solder the CPU or change it

I/O

connector

FPC

connector

Main FPC

Power IC

Charging

switch

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

Check the CPU work normally or not, Re-Solder CPU or change it

CPU

LCD

connector

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

Check the CPU work normally or not, Re-Solder CPU or change it

TP connector

CPU

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