Micromax A290 Manuale utente

A290 L2 Service Manual

1. Technical Specifications

Particular

Remarks

Key Matrix For Flashing

Chipset

MT6592M

Android Version

Android 4.4.2

Frequency

1.4GHz

Network Mode

900MHz/1800MHz/1900MHz/850MHz

WCDMA 900MHZ/2100 MHz

ROM

RAM

Internal SD Card memory

5.64G (share with data memory)

Expandable Memory

32G

Factory mode code

Press vol+/ 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%

A290 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：Service Details

Main Components

Camera

connector

Vibrator

connector

LCD

connector

Earphone

Connector

SPK

Battery

connector

RF coaxial

line

Main FPC

Battery

A290 L2 Service Manual

1. Does not power on

S.NO

Possible Cause

Validation steps

Action

NO power on

Power on key is fail

Change keys

Battery capacity level is

too low

Battery capacity

Charging the tablet

Sw issue

Flash the handset with latest SW

PCBA faulty

Replace PCBA / Refer L3 Repair

A290 L2 Service Manual

2. Display issue/No display

S.NO

Possible Cause

Validation steps

Action

No display

Sw issue

Flash the handset with latest SW

LCD fail

Change LCD

PCBA fail

Change PCBA

Colored screen

LCD fail

Change LCD

Dark screen

LCD fail

Change LCD

Sw issue

Flash the handset with latest SW

LCD backlight circuit issue

Change PCBA

LCD backlight is set

too low by person

Reset the value of backlight

A290 L2 Service Manual

3. Touch panel

S.NO

Possible Cause

Validation steps

Action

TP not working

SW Issue

Flash the handset with latest SW

TP issue

Charge TP

TP connection issue

Assemble TP again

PCBA issue

Refer to L3 repair

TP not working proper

TP issue

Charge TP

PCBA issue

Refer to L3 repair

A290 L2 Service Manual

4. Proximity Sensor

S.NO

Possible Cause

Validation steps

Action

Proximity sensor fail

SW Issue

Flash the handset with latest SW

Sensor holder is not

assembled well

Re-assemble the sensor holder

PCBA issue

Change PCBA

Sensor

A290 L2 Service Manual

5. G-sensor

S.NO

Possible Cause

Validation steps

Action

G-sensor is not working

SW Issue

Flash the handset with latest SW

Set problem

Reset mobile

PCBA issue

Change PCBA

6. Keys

S.NO

Possible Cause

Validation steps

Action

Key is not response

Key is fail

Change Keys FPC

The feeling of pressing

key is bad

Key is fail

Change Keys FPC

Key is not assembled well

Re-assemble

A290 L2 Service Manual

7. Charging

S.NO

Possible Cause

Validation steps

Action

Cannot charge into

Adapter is fail

Change adapter

Have charging icon, but

not charged

SW Issue

Flash the handset with latest SW

PCBA fail

Change PCBA

Battery fail

Change battery

Battery connector issue

Change battery connector

Battery

connector

A290 L2 Service Manual

8. USB

S.NO

Possible Cause

Validation steps

Action

Cannot connect to PC

USB cable is fail

Change USB cable

Main FPC fail

Change Main FPC having I/O connector

PCBA fail

Change PCBA

I/O

connector

A290 L2 Service Manual

9. Front Camera

S.NO

Possible Cause

Validation steps

Action

Colored screen when

open front camera

Camera is fail

Change camera

PCBA fail

Change PCBA

Cannot turn on front

camera

Sw issue

Flash the handset with latest SW

Camera fail

Change camera

PCBA fail

Change PCBA

10. Rear Camera

S.NO

Possible Cause

Validation steps

Action

Colored screen when

open front camera

Camera is fail

Change camera

PCBA fail

Change PCBA

Cannot turn on front

camera

Sw issue

Flash the handset with latest SW

Camera fail

Change camera

PCBA fail

Change PCBA

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