Micromax Q346 User manual

Q346 L2 Service Manual

1. Technical Specifications :

Particular

Remarks

Key Matrix For Flashing

Chipset

SC7731

Android Version

Android5.1

Frequency

GSM：900/1800MHzUMTS：900/2100MHz

Network Mode

Dual SIM: WCDMA+GSM

ROM

8Gb

RAM

1Gb

Internal SD Card memory

Expandable Memory

MB can support up 32 Gb T card

Factory mode code

*#1923#

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

Description

Reason

Solution

Doesn’t power on

Battery connector dirty

Cleaning the battery connector

Power key FPC badly solder

Re-solder power key FPC

Q346 L2 Service Manual

Power key FPC is broken

Change power key FPC

Power key FPC install badly

Re-install power key FPC

Main PCBA is broken

Refer to L3 service manual

2. RESTART/Hang

Description

Reason

Solution

RESTAR/Hang

Software corrupt

Upgrade the SW

power key get stuck,

Assemble the key or attach

power key FPC again

Re-assemble the key or Re-attach power key FPC

Power key FPC badly install

Re-install power key FPC

Main PCBA is broken

Refer to L3 service manual

3. LCD issue

Description

Reason

Solution

LCD issue

LCD FPC was installed badly

Re-install LCD FPC

LCD is broken

Replace LCD

Main PCBA is broken

Refer to L3 service manual

Battery

connector

Power key

Power

key FPC

Power key

FPC

Power key

FPC

Q346 L2 Service Manual

4. TOUCHPAD ISSUE

Description

Reason

Solution

TP issue

TPFPC was installed badly

Re-install FPC

TP is broken

Replace TP

Main PCBA is broken

Refer to L3 service manual

5. PROXIMITY SENSOR

6. ACCELEROMETER

Description

Reason

Solution

ACCELEROMETER

Main PCBA is broken

Refer to L3 service manual

7. Keypad

Description

Reason

Solution

Keypad

side key get Stuck, Assemble the

key again

Re-assemble the key again

Power key FPC badly install

Re-install power key FPC

Keypad or Power key FPC is broken

Replace keypad or Power key FPC

TPFPC was installed badly

Re-install TP FPC

TP is broken

Replace TP

Main PCBA is broken

Refer to L3 service manual

LCD

FPC

Q346 L2 Service Manual

8. Charging

Description

Reason

Solution

charging

Charger or battery or USB

cable is broken

Replace charger or battery or USB cable

USB connector is dirty

Clean USB connector

Main PCBA is broken

Refer to L3 service manual

9. USB

Description

Reason

Solution

USB

USB cable is broken

Replace USB cable

USB connector is dirty

Clean USB connector

Main PCBA is broken

Refer to L3 service manual

10. Front camera issue

Keypad

Data cable

LCD

FPC

USB connector

Keypad

Q346 L2 Service Manual

Description

Reason

Solution

camera

Camera FPC is badly install

Re-install camera FPC

Camera is broken

Change it

Main PCBA is broken

Refer to L3 service manual

10. Rear camera issue

Description

Reason

Solution

camera

Camera is installed badly

Re-install camera

Camera is broken

Change it

Main PCBA is broken

Refer to L3 service manual

12. Flash light

Description

Reason

Solution

Flash light

Camera module is installed

badly

Re-install camera module

Camera module is broken

Change it

Main PCBA is broken

Refer to L3 service manual

Q346 L2 Service Manual

13. Vibrator

Description

Reason

Solution

vibrator

vibrator is bad solder

Re-solder vibrator

vibrator is broken

Change it

Main PCBA is broken

Refer to L3 service manual

14. SIM related ISSUE/ Network

Description

Reason

Solution

Can’t read SIM

SIM slot pin or SIM pin is dirty

Clean SIM slot pins& SIM PIN

SIM is broken

Change it

Main PCBA is broken

Refer to L3 service manual

network

Antenna pin or touch point is

dirty

Clean antenna pin and touch point

Antenna is broken

Change it

Q346 L2 Service Manual

Calibration data missing

Flash the SW

Main PCBA is broken

Refer to L3 service manual

15. 3G-LTE not working

Description

Reason

Solution

3G-LTE

Antenna pin or touch point is

dirty

Clean antenna pin and touch point

Antenna is broken

Change it

Calibration data missing

Flash the SW

Main PCBA is broken

Refer to L3 service manual

Clean SIM

SIM slot

Antenna

Touch point

Clean SIM

SIM slot

The pin of

Antenna

Q346 L2 Service Manual

16. WIFI/BLUE TOOTH

Description

Reason

Solution

WIFI/BT no

signal

Antenna pin or touch point is dirty

Clean antenna pin and touch point

Antenna is broken

Change it

Calibration data missing

Update SW

Change it

Main PCBA is broken

Refer to L3 service manual

17. FM issue

Description

Reason

Solution

No signal

SOFTWARE issue

Update SW

Headset is broken

Change it

Earphone jack is broken

Change it

Main PCBA is broken

Refer to L3 service manual

WIFI/BT antenna

The pin of

Antenna

Touch point

Q346 L2 Service Manual

18. Heating

Description

Reason

Solution

Device heating

battery issue

Change it

Main PCBA is broken

Refer to L3 service manual

19. Earphone

Description

Reason

Solution

No function

earphone issue

Change it

Earphone jack is dirty

Clean earphone jack

Earphone jack is broken

Change it

Main PCBA is broken

Refer to L3 service manual

20. Outgoing audio/MIC

Description

Reason

Solution

No voice/volume

low

Mic issue

Change it

Mic didn’t place properly

Re-place it

Mic solder issue

Re-solder it

Main PCBA is broken

Refer to L3 service manual

Earphone jack

Earphone

Q346 L2 Service Manual

21. Incoming audio/earpiece

Description

Reason

Solution

No voice/volume

low

Receiver pin or touch point is

dirty

Clean receiver pin and touch point

Receiver is broken

change it

Main PCBA is broken

Refer to L3 service manual

22.speaker

Description

Reason

Solution

No voice/volume

Speaker’s pin can’t touch the

speaker FPC issue

Re-install speaker or re-attach the speaker

FPC it

The speaker FPC can’t touch the pin

of PCBA

Re-attach the speaker FPC

speaker is broken

change it

Main PCBA is broken

Refer to L3 service manual

MIC

Receiver

MIC

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