CSL G16, G13, EM941 Service Manual

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G16(EM941) SERVICE MANUAL

GSM/GPRS 900/1800MHz

Support EDGE, only downloading.

WAP/MMS

GPRS Class 12

player

MP3 player

music library

SRS

Voice Recorder

FM Radio

Micro USB 2.0

JAVA

Main WIFI

Blue tooth

MSN,Yahoo messenger,Youtube, Google talk,

Facebook,Twitter,Mini Opera,Google search

3.5mm Audio Jack,Yamaha amplifie

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INTRODUCTION

The purpose of this document is to help service workshop technicians to service products. This service
manual must be used only by authorized service suppliers. The content of it is confidential. Please note that
provides other guidance documents for service suppliers. Follow these regularly and comply with the given
instructions. while every effort has been made to ensure the accuracy of this document, some errors may
exist. please keep in mind also that this documentation is continuously being updated and modified, so
always watch out for the newest version.

CAUTIONS

Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance,
which include important safety information.

1. Servicing and alignment must be undertaken by qualified personnel only.

2. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.

3. Use only approved components as specified in the parts list.

4. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and
alignment

5. Ensure all cables and wires are repositioned correctly

Electrostatic discharge can easily damage the sensitive components of electronic products. Therefore,
every service supplier must observe the precautions which mentioned above.

GENERAL REPAIR INFORMATION

1. Make sure your testing equipment is functioning properly before beginning repair work.

2. before starting repairs you must observe ESD precautions such as being in your ESD
protected area and connecting your wristband.

3. use gloves to avoid corrosion and fingerprints.

4. cover windows and displays with a protective film to avoid dust and scratches.

5. use a lint-free cloth to clean the LCD.

6. when cleaning the pads use a soft cloth\ESD brush and isopropanol. Do not use a glass
fiber pencil: this scratches the surface and will corrosion.

7. non-faulty mechanical parts(except shielding lids and bent parts or soldered components).
May be reused if they are not soldered.

8. when removing the shielding lids make sure to replace them with new ones, otherwise the
high-frequency leakage can affect the device.

9. always use the original spare parts.

10. check the soldering joints of the parts concerned with regard to the fault symptom. And
resolder them if necessary.

11. remove excess soldering flux after repair.

12. observe the torque requirements when assembling the unit.

13. please aware that some malfunctions may be software related and solved by an update

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DISASSEMBLY AND ASSEMBLY

SERVICE TOOLS

Voltage regulator

Multimeter

Iron

850 heater

Constant temperature heater

Oscillograph

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Wrist grounding strap, Antistatic gloves

Wrist
grounding strap

Antistatic gloves

Software
download cable

Microscope

Solder wire, soldering paste

Metal tweezers, Screw driver, SRT-6 Plates

Metal tweezers

SRT-6

Screw driver

MTK series CPU plate

Plate

soldering paste

Solder wire

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DISASSEMBLY

Pull out battery cover.

Take out the screws.

Take off the back cover.

Separate the FPC connector

Take off the screw

Prize up the middle housing.

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Paste the film on lens and LCD

Take PCBA out of A cover

Take off the main key

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ASSEMBLY

Put the PCBA into A cover

Close the FPC connector

Put the cover on the PCBA Install the screw

Close back cover and front cover together.

Install power on key

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-FINISH-

Lock the screws

Assemble battery cover

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Chapter 2

SYSTEM BLOCK DIAGRAM

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Chapter4

ACTUALL BOARD

PCBA layout drawing A side:

J701 LCD connector

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Electronic schemes

Main CPU

③

①

②

④

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Keypad input

①