Micromax Q452 Manuale utente

Q452 L3 Service Manual

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

ROM

16G

RAM

Internal SD Card memory

10.8G

Expandable Memory

64G

Factory mode code

Press Vol-/ power key at the same time

Good Earpiece volume

32Ω± 15%

Good Loudspeaker volume

8Ω± 5%

Good MIC volume

2.2kΩ± 5%

Good Vibrator volume

30Ω± 5%

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

RF 2G PA

（U1200）

（）

Flash

（U401）

CPU

（U400）

BT/WIFI/GPS/

( U1300)

Receiver

Connector

（SC4/SC5）

Main camera

connector

(J1501)

P-Sensor

( U1703)

XTAL

（Y801）

Power IC

(U601)

USB

Connector

（J1804）

3/4G PA

Backlight driver

(U1401)

RF IC

（U800）

（）

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 fresh data cable

Earphone

Connector

(J1601）

Switch

charge IC

(U1802)

Audio PA

(U1600)

LCD

Connector

(J800)

Front Camera

connector

(J1500)

connector

(J1402)

SIM

connector

(J1800)

Side KEY

connector

(J703)

Battery

connector

(J1802)

T-Flash

connector

(J1803)

Flashlight

driver

(U1502)

Flashlight

(D1502)

SIM

connector

(J1801)

4G NET

ANT

(E1101/E1102

)

WIFI/BT/GPS

ANT

(E1300/E1301)

G-Sensor

(U1700)

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

USB

Connector

CPU

Flash

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

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 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

Power IC

Switch

Charging IC

switch IC

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

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

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

connector

CPU

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