Micromax A190 User manual

A190 L2 Service Manual

1. Technical Specifications

Below given remarks are for reference only

Particular

Remarks

Key Matrix For Flashing

N/A

Chipset

MT6591

Android Version

KITKAT 4.4.2

Frequency

Quad 1.5GHz

Network Mode

GSM850/900/1800/1900

WCDMA 900/2100

ROM

8GB

RAM

1GB

Internal SD Card memory

Expandable Memory

32GB

Factory mode code

*#510838#

A190 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

Soldering issue of sidekey

Re-soldering

Sidekey broken

Change the sidekey FPC

Mainboard issue

Refer to the L3 Repair

Check if the sidekey is

broken and solder issue.

A190 L2 Service Manual

(2) TP&LCD

No.

Description

Reason

Solution

LCD segments missing, Fading, Contrast

issue, Black lines, Color issue, Backlight

issue, Blank display, Bad pixel, Flickering.

LCD FPC assemble

issue

Reassemble LCD FPC

LCD FPC broken

Change the LCD

Mainboard issue

Refer to the L3 Repair

RE-FLASH THE SW

LCD

Mechanically broken

LCD issue

Change the LCD

LCD broken

Change the LCD

TP not working and the light perception

issue.

FPC assembly

Reassemble the FPC

FPC broken

Change the TP

Mainboard

Refer to the L3 Repair

The light perception

issue.

Change the TP

TP Mechanically broken

TP issue

Change the TP

TP broken

Change the TP

Check the TP/LCD FPC if it is assembled OK.

Check the LCD

FPC if it is

assembled OK.

Check the TP

FPC if it is

assembled OK.

A190 L2 Service Manual

Take off the LCD, and then check and test if it is working normally use the jig and fixture.

Test the mainboard if it is OK by the PCBA jig and fixture.

A190 L2 Service Manual

(4) Charging

NO.

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

Refer to the service guide L3

(5) USB

NO.

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

Cannot use DATA

D+ or D- is broken

Change the data cable

A190 L2 Service Manual

(6) Main Camera/ Front Camera

NO.

Description

Reason

Solution

Camera not

ready/not

working/no function

Connection issue

Re-connecting

Camera issue

Change the camera

CPU

Refer to the service guide L3

Front camera can’t

open

Camera issue

Change the front camera

Rear camera can’t

open

Camera issue

Change the front camera

Bad image

Assemble issue

Reassemble the camera

Camera issue

Change the camera

CPU

Refer to the service guide L3

Rear Camera

Front Camera

A190 L2 Service Manual

(7) Vibrator

NO.

Description

Reason

Solution

No vibrating

Soldering issue

Re-soldering the vibrator

Vibrator issue

Change the Vibrator

CPU

Refer to the service guide L3

Assemble issue

Reassemble the vibrator

(8) Network&3G –LTE not working

NO.

Description

Reason

Solution

No signal

The coaxial cable assembly issue

Reassemble

GSM antenna assembly issue

Reassemble

SIM card broken

Change a new SIM card

RF IC issue

Refer to the service guide L3

Have not calibration

Re-calibrate

CPU

Refer to the service guide L3

Vibrator

Coaxial cable

GSM antenna

and the stand

A190 L2 Service Manual

(9) WIFI & Bluetooth & GPS

NO.

Description

Reason

Solution

No signal

Wifi/BT antenna stand assembly

issue

Reassemble

Mainboard

Refer to the service guide L3

BT/WIFI antenna

and the stand

GPS antenna

and the stand

A190 L2 Service Manual

(10) FM / Radio

NO.

Description

Reason

Solution

No signal

Earphone issue

Change a new earphone

Earphone Jack of mainboard

issue

Refer to the service guide L3

Earphone jack

A190 L2 Service Manual

(11) Ear Phone

NO.

Description

Reason

Solution

One side is not working

Earphone issue

Change a new earphone

Cable broken

open the housing of MIC, check

and solder the cable

CPU or charging IC with issue

Refer to the service guide L3

Noise

Cable broken

open the housing of MIC, check

and solder the cable

Cable broken

open the housing of MIC, check

and solder the cable

MIC is not working

MIC issue

Change the earphone

Cable broken

open the housing of MIC, check

and solder the cable

Can’t end the call by

earphone

Assembly issue

Open the MIC housing ,check

and assembly again

Earphone

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