Micromax L2 User manual

GC318 L2 Service Manual
1. Technical Specifications
Particular
Remarks
Key Matrix For Flashing
N/A
Chipset
MTK6260A QSC1110
Android Version
N/A
Frequency
360Mhz
Network Mode
GSM 900/1800
CDMA 800
GSM
128 0Mb
CDMA
128 32Mb
Internal SD Card memory
NO
Expandable Memory
8GB
Factory mode code
*#629#
Good Earpiece value in ohms
32Ω±15%
Good Loudspeaker value in ohms
8Ω ±15%
Good Mic value in ohms
1.0KΩ-2.2KΩ（test condition f=1KHZ，Pin=1Pa）
Good Vibrator value in ohms
59Ω±15% ohms
At 25℃

GC318 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
MB is broken
Refer to L3 service manual
Check weather End Key is broken

GC318 L2 Service Manual
2) Restart / Hang
NO.
Description
Reason
Solution
Battery malfunction
Replace battery & check
1
Restart / Hang
Software corrupt
Update Software
Check battery Connector
Clean & Change If required
MB issue
Refer to L3 service manual
Replace battery

GC318
L2 Service Manual
3)
LCD Issue
NO
Description
Reason
Solution
Exchange the front shell module to
Problem in the LCD
judge if the LCD is OK
Damage of the LCD
Replace the LCD connector
connector
Soldering abnormality or
damage of the diode
1
Black screen and no display
of LCD
Abnormality or damage of
Refer to the service guide L3
the backlight driver IC
Soldering abnormality or
Black screen, white screen
damage of the EMI devices
2
and blurred screen when the
Refer to the service guide L3
backlight is OK
connected in series on the
LCD MIPI signal line
Front shell
assembly
LCD connector

GC318 L2 Service Manual
4) Keypad
NO.
Description
Reason
Solution
1
Keys doesn't work
MB is broken
Refer to L3 service manual

GC318 L2 Service Manual
5) Charging
NO
Description
Reason
Solution
Data cable issue
Change the data cable
I/O connector
Change the I/O connector
1
No charging
Charger issue
Change the charger
CPU
Refer to the service guide L3
Data cable issue
Change the data cable
2
Charging slow
I/O connector
Change the I/O connector
CPU <VCHG is poor soldering>
Refer to the service guide L3
CHARGER
CHARGER

GC318
L2 Service Manual
6)
USB
NO
Description
Reason
Solution
CABLE ISSUE
Change it
CHARGER ISSUE
Change it
1
NO CHARGING
The I/O connector of PCBA is
Change the I/O connector
with issue
CPU
Refer to the service guide L3
2
Cannot use DATA
D+ or D- is broken
Change the data cable
DATA CABLE

GC318
L2 Service Manual
7) Back Camera
NO
Description
Reason
Solution
Soldering issue
Re-solder it
1
Bad image
Camera issue
Change it
CPU
Refer to the service guide L3
Soldering issue
Re-solder it
2
Camera not ready
Camera issue
Change it
CPU
Refer to the service guide L3
Soldering issue
Soldering issue
3
DEAD, No functionality
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
Back camera with

GC318 L2 Service Manual
8) LED Light
NO.
Description
Reason
Solution
1
G-sensor doesn't work
MB is broken
Refer to L3 service manual
9)
Vibrator
NO
Description
Reason
Solution
The main FPC is not
Reinstall it
properly installed.
Problem of the main
Replace the main FPC
1
Vibration failure
FPC
Problem of the
Replace the subboard
subboard
Refer to the service guide
PMU
L3
MOTOR

GC318 L2 Service Manual
10) Sim Related Issues / Network
NO
Description
Reason
Solution
the connection of antenna is not
Assembly it again
good
SIM issue
use a fresh SIM to verify it
1
No signal
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
11) Bluetooth
NO.
Description
Reason
Solution
1
No signal
Wifi\BT antenna bracket assembly issue
Re-assemble
MB is broken
Refer to L3 service manual

GC318 L2 Service Manual
12) 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
13) Heating
NO.
Description
Reason
Solution
1
Device Heating
Battery issue
Change a new battery
MB issue
Refer to L3 service manual

GC318 L2 Service Manual
14) Ear Phone
NO
Description
Reason
Solution
earphone issue
change the earphone
ONE SIDE IS NOT
Cable broken
open the housing of MIC, check and solder the cable
1
WORKING
I/O connector Issue
Replace I/O connector
CPU or charging IC with
Refer to the service guide L3
issue
Cable broken
open the housing of MIC, check and solder the cable
2
Noise
SPK issue
Change the earphone
I/O connector Issue
Replace I/O connector
MIC issue
Change the earphone
3
MIC is not working
Cable broken
open the housing of MIC, check and solder the cable
4
Can’t end the call by
Assembly issue
Open the MIC housing ,check and assemble it again
earphone
EARPHONE

GC318 L2 Service Manual
15) Outgoing Audio / MIC
NO.
Description
Reason
Solution
There is dust with MIC
Clean the MIC
Solder issue
Re-solder it
1
Noise with uplink side
MIC issue
Change the MIC
The
main
LINK
FPC
Reassemble the Link FPC
assembly issue
CPU or related component
Refer to L3 service manual
There is dust with MIC
Clean the MIC
Solder issue
Re-solder it
2
Volume
low/no
MIC issue
Change the MIC
volume with uplink side
The
main
LINK
FPC
Reassemble the Link FPC
assembly issue
CPU or related component
Refer to L3 service manual
3
TDD noise
MIC issue
Change the MIC

GC318 L2 Service Manual
16) Incoming Audio / Earpiece & Speaker & Vibrator
NO
Description
Reason
Solution
There is dust with receiver
Clean the receiver
1
Noise/crack
Receiver issue
Change it
PMU
Refer to the service guide L3
Connection issue
Assembly it again
2
No voice/ volume low
Receiver issue
Change it
PMU
Refer to the service guide L3
RECEIVER

GC318
L2 Service Manual
17) Speaker
NO
Description
Reason
Solution
The SPK with dust
Clean the SPK
SPK foam issue
Change it
1
Noise/crack
SPK issue
Change it
CPU
Refer to the service guide L3
Soldering issue
Re-soldering it
2
No volume
SPK issue
Change it
CPU
Refer to the service guide L3
Soldering issue
Re-soldering it
3
Low volume
SPK issue
Change it
CPU
Refer to the service guide L3
The volume of good SPK is 8Ω +/-0.5
SPK

GC318
L2 Service Manual
18) 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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