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
NO
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
1
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
1
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
SW
RE-FLASH THE SW
2
LCD
Mechanically broken
LCD issue
Change the LCD
LCD broken
Change the LCD
3
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
4
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
1
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
2
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
(5) USB
NO.
Description
Reason
Solution
1
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
2
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
1
Camera not
ready/not
working/no function
Connection issue
Re-connecting
Camera issue
Change the camera
CPU
Refer to the service guide L3
2
Front camera can’t
open
Camera issue
Change the front camera
3
Rear camera can’t
open
Camera issue
Change the front camera
4
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
1
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
1
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
1
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
1
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
1
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
2
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
3
MIC is not working
MIC issue
Change the earphone
Cable broken
open the housing of MIC, check
and solder the cable
4
Can’t end the call by
earphone
Assembly issue
Open the MIC housing ,check
and assembly again
Earphone