Micromax A310 User manual

A310 L3 Service Manual
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1. Technical Specifications :
Particular
Remarks
Key Matrix For Flashing
NA
Chipset
MT6592
Android Version
Android 4.4
Frequency
GSM：900/1800/1900MHz UMTS：900/2100MHz
Network Mode
Dual SIM: WCDMA+GSM
ROM
8 GB
RAM
2 GB
Internal SD Card memory
5GB User available
Expandable Memory
32GB
Factory mode code
*#9527*#
2. CAUTIONS

A310 L3 Service Manual
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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.

A310 L3 Service Manual
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Basic Structure of the Mobile Phone
1. PCBA Pictures of A310 Mainboard

A310 L3 Service Manual
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A310 L3 Service Manual
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A310 L3 Service Manual
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3. L3 Level trouble shooting
1) Doesn’t Power On
Solution:
There is no current when the Power Key is pressed; check SW2001 and J2002 to see if there is false soldering,
pseudo soldering or damage, if yes, Carry out resoldering or replacement;
There is no display when the Power Key is pressed, and the current stays within 100~120mA, if yes, The
problem is caused by pseudo soldering or damage of the memory; carry out repair soldering or replacement
of the memory;
When the Power Key is pressed, the display freezes in a certain interface, if yes, Upgrade the software version;
There is current when the Power Key is pressed; the current changes to 0~5mA when the key is loosened , if
yes, The problem is caused by pseudo soldering or damage of 32K or 26M crystal (X701, X1001); carry out
repair soldering or replacement of the crystal. Or, it is caused by pseudo soldering or damage of PMIC;
There is heavy current when the Power Key is pressed, if yes, Find the hot point, and replace the
corresponding material (PMIC (U701) and CPU (U201) are damaged in most cases).

A310 L3 Service Manual
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Power Key
Battery Connector

A310 L3 Service Manual
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2) Restart / Hang
Refer same to Power failure issue.
3) LCD Issues “Black screen and no display of LCD”
Solution:
Exchange the front shell to judge if the LCD itself is abnormal , if yes, Replace the LCD;
Check if the LCD connector is damaged (such as burnout) , if yes, Replace the LCD connector J1802;
Check if the diode D1803 in the backlight circuit is soldered abnormally or damaged, if yes, Carry out repair
soldering or replacement of D1803;
Check if the power inductor L1800 in the backlight circuit is soldered abnormally or damaged, if yes, Carry out
repair soldering or replacement of L1800;
Replace the backlight driver IC (U1801).
Backlight Driver IC

A310 L3 Service Manual
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Black screen, white screen and blurred screen of LCD when the backlight is OK.
Solution:
Exchange the front shell to judge if the LCD itself is abnormal, if yes, Replace the LCD;
Check if the LCD connector is damaged , if yes, Replace the LCD connector J1802;
Check if the EMI devices (LB1800, LB1801, LB1802, LB1803, LB1804) connected in series on the LCD MIPI
signal line are soldered abnormally or damaged , if yes, Carry out repair soldering or replacement of LB1800,
LB1801, LB1802, LB1803 or LB1804;
Check if the LCD power supply U1807 is abnormal or damaged, if yes, Carry out repair soldering or
replacement of U1807.

A310 L3 Service Manual
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LCD Circuit