cromax P310 Service Manual

P310 L2 Service Manual

Product introduce

Model ：P310

Product size：188.4*108.3*10mm

Platform：MTK8317 ，Quad 1.0GHz

Memory：4GB+1GB (Nand&sdram+RAM）

System：Android 4.1.2

Frequency band: Dual-SIM WCDMA 900/2100MHz，GSM 900/1800 MHZ

Battery：2800mAh

Charger: Travel charger

USB cable: MICRO 5PIN

Earphone：3.5jack

LCD&TP： resolution: 1024*600，Capacitance TP

Camera：2.0M+0.3M

Support：FM, GPS，BT4.0，WIFI

Support：G-sensor

P310 L2 Service Manual

1. Tools list

I. Tweezer Cross

II. Screw driver

III. Solder

IV. Tommy bar

V. Hot gun

P310 L2 Service Manual

2. Cover Plate disassembly

 Open the cover plate，as the Fig. 1

FIG.1

COVER PLATE

P310 L2 Service Manual

3. Back case disassembly

 Insert tommy bar into the gap between middle frame and back case, then

slide it slowly along the gap, as the Fig.2

FIG.2

P310 L2 Service Manual

4. Disassemble battery&speaker&mic&motor

 First, remove battery with soldering iron. Then remove the four screws as

shown in the fig.3 to disassemble speaker holder and antenna holder.

FIG.3

FIRST REMOVE

FOUR SCREWS

P310 L2 Service Manual

5. Tear off conduction tape and high temp tape，as the Fig.4

FIG.4

P310 L2 Service Manual

6. The main components distribution，as the fig.5

FIG.5

TOUCH IC

CPU/DDR/PMU

FLASH

WIFI+BT MODEL

P310 L2 Service Manual

7. Remove the three screws and open the LCD con. & TP con.,as the fig.6

FIG.6

TF CON

LCD CON

P310 L2 Service Manual

8. Remove main board from case，as the FIG.7

FIG.7

P310 L2 Service Manual

9. Remove camera ，as the FIG.8

FIG.8

CAM

P310 L2 Service Manual

10.Receiver disassembling, as the fig.9

FIG.9

RECEIVER

P310 L2 Service Manual

11. Exploded view

MIC

MOTOR

CAM

SPK

RECEIVER

PCBA

COVER PLATE

HOLDER

BACK CASE

MIDDLE FRAME

BATTERY

LCD

P310 L2 Service Manual

L1 & L2 Repairing guide

1. LCD

 Check the SW is correct, otherwise to upgrade the SW;  Check the LCD is ok, otherwise change a new LCD;  Ifthe LCD loose, re-assemble the LCD and test;  Checking the LCD connector is ok, otherwise re-solder it or change a new

one;

 Check the circuit around the LCD connector.

LCD CONNECTOR

P310 L2 Service Manual

2. Camera

 Check the camera assemble correctly, otherwise re-assemble the camera

and test;

 Cross test with a good camera, and check the camera is ok;  Check the camera connector is ok as shown in the below picture,

otherwise re-solder or change a new one;

 Check the circuit around the camera connector.

CAM CONNECTOR

P310 L2 Service Manual

3. Touch Pannel

 Check the SW is correct, otherwise to upgrade the SW;  Check the FPC of TP is correct, otherwise re-assemble it;  Cross test with a good TP;  Check the TP connector is correct, otherwise re-solder or change a new

one;

 Check the circuit around the TP connector.

P310 L2 Service Manual

4. Ringer

 Check the shrapnel of speaker is ok;  Check the resistance of speaker is ok, otherwise to change a new one;  Check the FPC is ok;  Check SPK-FPC connector with sub-board is ok.

SPEAKER

P310 L2 Service Manual

5. Receiver

 Check the shrapnel of receiver is ok;  Check the resistance of receiver is ok, otherwise change a new one;  Check the connector point on the main board is ok, as shown in the below

picture;

 Check the receiver circuit is ok.

P310 L2 Service Manual

6. MIC and Vibrator

 Check the MIC and Vibrator is cold soldering, otherwise re-solder it;  Change the MIC and Vibrator;  Check the circuit of MIC and Vibrator;  Check the FPC is connect correctly.

MIC

VIBRATOR

P310 L2 Service Manual

7. Earphone

 Check the shrapnel of earphone is ok;  Check the connector point on the main board is ok, as shown in the below

picture;

 Change earphone connector;  Check the circuit of earphone is OK.

EARPHONE

P310 L2 Service Manual

8. No Power On / Dead

 Check the voltage of battery is 3.8-4.2V and connect correctly;  Upgrade the SW;  Check power on key and the circuit around it.

POWER BUTTON

P310 L2 Service Manual

9. No Charging

 Checkthe voltage of battery is over 3.4V;  Check the charger and USB cable is ok;  Check the USB connector and circuit is ok.

USB CONNECTOR

P310 L2 Service Manual

10. No SIM card and no memory card

 Check the connector of T –card and SIM card;  Change the connector of T –card and SIM card;

Thanks

For any questions or suggestions please email to [email protected]

SIM

TF