Micromax Q346 Service Manual Download Page 7

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Q346

L3 Service Manual

3、Not charging:

Solution：

1. Use a fresh USB data cable or charger, re-solder the USB (J609) connector.

2. Check charge mosfet (Q501) is poor soldering, shorted or damaged.

3. Check Mid PIN of battery connector is poor soldering or not, check the related component is shorted,

broken or not side key might be broken,

(Q501 might be broken)

4. Re-Solder the CPU (U0100) or change it.

Summary of Contents for Q346

Page 1: ...fication USB J609 ns Particular Remarks Key Matrix For Flashing Volume Chipset SC7731 Android Ver USB J609 n Android 5 1 Frequency 1 3G Network Mode GSM 900 1800MHz WCDMA 900 2100MHz Rom 8G RAM 1G Int...

Page 2: ...out at an anti static workstation USB J609 n 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 a...

Page 3: ...Q346 L3 Service Manual C L3 Service Manual...

Page 4: ...Q346 L3 Service Manual...

Page 5: ...e the poor soldering of USB J609 Connector please check the soldering quality of USB J609 Connector first and then check the related diagram Solution 1 Use a fresh data cable 2 Check the USB J609 conn...

Page 6: ...R619 from net PWRKEY to net PBINT is correct or not 2 Power on the handset with DC to verify its current is correct or not check the diagram of VBAT VBUS is shorted or damaged 3 Re Solder the 26M X90...

Page 7: ...lder the USB J609 connector 2 Check charge mosfet Q501 is poor soldering shorted or damaged 3 Check Mid PIN of battery connector is poor soldering or not check the related component is shorted broken...

Page 8: ...Q346 L3 Service Manual 4 LCD Display problem Solution 1 Re Solder the LCD or change it 2 Re Solder the CPU U0100 or change it...

Page 9: ...king Solution 1 Assembly the vibrator or change it 2 Check the vibrator circuit soldering quality 3 Re Solder the CPU U0100 or change it 6 Camera is not working Solution 1 Re Solder the camera or chan...

Page 10: ...Q346 L3 Service Manual 7 MIC no sound Solution 1 Assembly the micphone or change it 2 Check the micphone circuit soldering quality 3 Re Solder the CPU U0100 or change it...

Page 11: ...er circuit verify it is shorted with grounding or not 3 Check R714 R715 C712 C713 RV707 RV708 4 Re Solder the CPU U0100 or change it 9 Speaker not working Solution 1 Assembly the speaker or change it...

Page 12: ...Q346 L3 Service Manual 10 FM not working Solution 1 Check phone jack J701 2 Check the FM circuit built in soldering quality 3 Re Solder the CPU U0100 or change it 11 BT is not working fine...

Page 13: ...100 or change it 12 Can t detect the SIM card Solution 1 Check the connection of SIM card or change a fresh SIM card to verify it 2 Check soldering quality of the SIM connector 3 Check the SIM diagram...

Page 14: ...Q346 L3 Service Manual 13 RF module Solution 1 Flash the SW 2 Check the GSM antenna connection 3 If there was no signal then re solder or change the RF PA 4 Re solder the CPU U0100 or change it...

Page 15: ...Q346 L3 Service Manual Thanks For any Query or suggestion Please write to tech help micromaxinfo com...