Micromax A109 User manual

A109 L2 Service Manual
1. Technical Specifications :
Particular
Remarks
Key Matrix For Flashing
NA
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
1
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
1
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
NO
Description
Reason
Solution
1
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
2
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
NO
Description
Reason
Solution
1
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
1
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
1
G-sensor doesn't work
MBis broken
Refer to L3 service manual
7) Keypad
NO.
Description
Reason
Solution
1
Keys doesn't work
MBis broken
Refer to L3 service manual

A109 L2 Service Manual
8) 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
CHARGER
CHARGER

A109 L2 Service Manual
9) USB
NO
Description
Reason
Solution
1
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
2
Cannot use DATA
D+ or D- is broken
Change the data cable
DATA CABLE

A109 L2 Service Manual
10) Front Camera
NO
Description
Reason
Solution
1
Bad image
Soldering issue
Re-solder it
Camera issue
Change it
CPU
Refer to the service guide L3
2
Camera not ready
Soldering issue
Re-solder it
Camera issue
Change it
CPU
Refer to the service guide L3
3
DEAD, No functionality
Soldering issue
Soldering issue
Camera issue
Change camera
CPU
CPU
4
Cannot turn to front camera
Camera issue
Change front camera
5
Cannot turn to back camera
Camera issue
Change back camera
Back camera with
flashlight
Front camera
Front camera
Back camera

A109 L2 Service Manual
11) Back Camera
Same as Front Camera
12) Flash Light
NO.
Description
Reason
Solution
1
G-sensor doesn't work
MBis broken
Refer to L3 service manual
13) Vibrator
NO
Description
Reason
Solution
1
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
L3
MOTOR

A109 L2 Service Manual
14) Sim Related Issues / Network
NO
Description
Reason
Solution
1
No signal
the connection of antenna is not
good
Assembly it again
SIM issue
use a fresh SIM to verify it
SIM slot issue
Refer to the service guide L3
RF IC issue
Refer to the service guide L3
Calibration data missing
Flash the SW
CPU
Refer to the service guide L3
15) 3G –LTE not working –NA
16) WI-FI / Bluetooth
NO.
Description
Reason
Solution
1
No signal
Wifi\BT antenna bracket assembly issue
Re-assemble
MB is broken
Refer to L3 service manual

A109 L2 Service Manual
17) FM / Radio
NO.
Description
Reason
Solution
1
No signal
Earphone issue
Change a new earphone
Earphone Jack of mainboard issue
Refer to L3 service manual
18) Heating
NO.
Description
Reason
Solution
1
Device Heating
Battery issue
Change a new battery
MB issue
Refer to L3 service manual

A109 L2 Service Manual
19) Ear Phone
NO
Description
Reason
Solution
1
ONE SIDE IS NOT
WORKING
earphone issue
change the earphone
Cable broken
open the housing of MIC, check and solder the cable
I/O connector Issue
Replace I/O connector
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
SPK issue
Change the earphone
I/O connector Issue
Replace I/O connector
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 assemble it again
A075 耳机
EARPHONE

A109 L2 Service Manual
20) Outgoing Audio / MIC
NO.
Description
Reason
Solution
1
Noise with uplink side
There is dust with MIC
Clean the MIC
Solder issue
Re-solder it
MIC issue
Change the MIC
The main LINK FPC
assembly issue
Reassemble the Link FPC
CPU or related component
Refer to L3 service manual
2
Volume low/no
volume with uplink side
There is dust with MIC
Clean the MIC
Solder issue
Re-solder it
MIC issue
Change the MIC
The main LINK FPC
assembly issue
CPU or related component
Reassemble the Link FPC
Refer to L3 service manual
3
TDD noise
MIC issue
Change the MIC

A109 L2 Service Manual
21) Incoming Audio / Earpiece & Speaker & Vibrator
NO
Description
Reason
Solution
1
Noise/crack
There is dust with receiver
Clean the receiver
Receiver issue
Change it
PMU
Refer to the service guide L3
2
No voice/ volume low
Connection issue
Assembly it again
Receiver issue
Change it
PMU
Refer to the service guide L3
RECEIVER

A109 L2 Service Manual
22) Speaker
NO
Description
Reason
Solution
1
Noise/crack
The SPK with dust
Clean the SPK
SPK foam issue
Change it
SPK issue
Change it
CPU
Refer to the service guide L3
2
No volume
Soldering issue
Re-soldering it
SPK issue
Change it
CPU
Refer to the service guide L3
3
Low volume
Soldering issue
Re-soldering it
SPK issue
Change it
CPU
Refer to the service guide L3
The volume of good SPK is 8Ω +/-0.5
SPK

A109 L2 Service Manual
23) Memory Card
NO.
Description
Reason
Solution
1
SD Card Issue
SD card corrupted
Change a new SD card
SD card slot issue
Clean SD card Connector ,
Replace IF required
Still not working
Refer to L3 service manual
Thanks
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