Micromax A109 User manual

A109 L2 Service Manual

1. Technical Specifications :

Particular

Remarks

Key Matrix For Flashing

Chipset

MT6589

Android Version

Android 4.4

Frequency

GSM：900/1800/1900MHz UMTS：900/2100MHz

Network Mode

Dual SIM: WCDMA+GSM

ROM

4 GB

RAM

1 GB

Internal SD Card memory

No less than 1.4GB

Expandable Memory

32GB

Factory mode code

*#9527*#

A109 L2 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. L2 Level trouble shooting

1) Doesn’t Power On

NO.

Description

Reason

Solution

Doesn’t Power On

Side Key FPC is badly soldered

Re-solder side key FPC.

Side Key is broken

Change a new Side Key

MB is broken

Refer to L3 service manual

Check weather Side Key is broken

A109 L2 Service Manual

2) Restart / Hang

NO.

Description

Reason

Solution

Restart / Hang

Battery malfunction

Replace battery & check

Software corrupt

Update Software

Check battery Connector

Clean & Change If required

MB issue

Refer to L3 service manual

Replace battery

A109 L2 Service Manual

3) LCD Issue

Description

Reason

Solution

Black screen and no display

of LCD

Problem in the LCD

Exchange the front shell module to

judge if the LCD is OK

Damage of the LCD

connector

Replace the LCD connector

Soldering abnormality or

damage of the diode

D1804 in the backlight

circuit

Refer to the service guide L3

Soldering abnormality or

damage of the power

inductor L1800 in the

backlight circuit

Refer to the service guide L3

Abnormality or damage of

the backlight driver IC

Refer to the service guide L3

Black screen, white screen

and blurred screen when the

backlight is OK

Soldering abnormality or

damage of the EMI devices

(U1806, U1807, U1808)

connected in series on the

LCD MIPI signal line

Refer to the service guide L3

LCD connector

Front shell

assembly

A109 L2 Service Manual

4) Touchpad Issue

Description

Reason

Solution

Malfunction of touch

screen

Problem of the TP

Exchange the front shell module to

judge if the TP is OK

Damage of the TP connector

Replace the TP connector

Pseudo soldering or damage of

R1806 and R1810 at the TP

connection

Refer to the service guide L3

CPU

Refer to the service guide L3

TP connector

Front shell

assembly

A109 L2 Service Manual

5) Proximity Sensor

NO.

Description

Reason

Solution

Proximity Sensor is

not well

MB is broken

Refer to L3 service manual

Proximity Sensor is not

well

Change the Sensor

TP is broken

Change the LCM

6) Accelerometer

NO.

Description

Reason

Solution

G-sensor

doesn't work

MBis

broken

Refer to

service

manual

7) Keypad

NO.

Description

Reason

Solution

Keys

doesn't work

MBis

broken

Refer to

service

manual

A109 L2 Service Manual

8) Charging

Description

Reason

Solution

No charging

Data cable issue

Change the data cable

I/O connector

Change the I/O connector

Charger issue

Change the charger

CPU

Refer to the service guide L3

Charging slow

Data cable issue

Change the data cable

I/O connector

Change the I/O connector

CPU <VCHG is poor soldering>

Refer to the service guide L3

CHARGER

A109 L2 Service Manual

9) USB

Description

Reason

Solution

NO CHARGING

CABLE ISSUE

Change it

CHARGER ISSUE

Change it

The I/O connector of PCBA is

with issue

Change the I/O connector

CPU

Refer to the service guide L3

Cannot use DATA

D+ or D- is broken

Change the data cable

DATA CABLE

A109 L2 Service Manual

10) Front Camera

Description

Reason

Solution

Bad image

Soldering issue

Re-solder it

Camera issue

Change it

CPU

Refer to the service guide L3

Camera not ready

Soldering issue

Re-solder it

Camera issue

Change it

CPU

Refer to the service guide L3

DEAD, No functionality

Soldering issue

Camera issue

Change camera

CPU

Cannot turn to front camera

Camera issue

Change front camera

Cannot turn to back camera

Camera issue

Change back camera

Back camera with

flashlight

Front camera

Back camera

A109 L2 Service Manual

11) Back Camera

Same as Front Camera

12) Flash Light

NO.

Description

Reason

Solution

G-sensor

doesn't work

MBis

broken

Refer to

service

manual

13) Vibrator

Description

Reason

Solution

Vibration failure

The main FPC is not

properly installed.

Reinstall it

Problem of the main

FPC

Replace the main FPC

Problem of the

subboard

Replace the subboard

PMU

Refer to the service guide

MOTOR

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