GW620 Service Training V1[1].1

LG UK Mobile ServiceTechnical Support Department

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GW620 Service Training

Revision : V1.1 (20 /April / 2010)

GW620 LG Intouch Max3D S-Class or ANDROID V1.5 user interface

QUALCOMM DBB MSM7200A

Training Guide




3. Halogens chemical properties

TABLE OF CONTENTS

Chapter Page

Pim Jore

With the collaboration of: Ruben Cuadrillero & Tony ProverbsMaterial produced by

Features & Appearance

1. Features. 3General description

2. Block diagram overall. 43. What is Android system (Architecture)

Linux Kernel 5The Dalvik & The Libraries 6

The Applications 74. What is new with Android system for LG handsets 85. Electronic compass

Physics I,II,II (New) 9,10 & 11Block diagram 12

Trouble shooting6. General topics 13

7. Electronic compass I & II. (New) 14 & 15

Further information. 16




1. Features This phone is mainly aimed at:

- 1st time Smart phone users

- Social networking

The customer can choose between the S-class user interface and the Android user interface.

To some extent the set of features is only limited by the hardware capabilities.

The customer can download any Android/JAVA

application/feature to his phone that is supported by the hardware.

Google applications integrated: Google Maps, G-Mail, Market, You Tube, Calendar, Talk.

SNS manager integrated with applications

Facebook, Twitter, Bebo

There is no TV-out on this design. There is no audio output on the 5 pin micro USB connector.

There is no VGA camera for video calling.

Without SD-card you cannot enter the mass

storage mode.Without SD card it is not possible to make and

save pictures and videos.A default 1 Gb SD-card is provided in the box in

most countries.

DLNA is not supported in Android currently so

also not available on GW620.

There is no PC suite for GW620, instead Moxier applications are provided on the phone. This set

of applications syncs directly with Microsoft

outlook on a PC.

GW620 is the first LGE phone with Android Software

Features:

3D S-Class or ANDROID user interface

Quad band GSM (With EDGE)

Dual band UMTS (with HSPA 7.2/2.0 MBPS)

5 MP Camera

HVGA LCD (320x480 with ambient light sensor)

Touch screen

WiFi (54 Mbps) & Bluetooth (2.1)

GPS

Electronic Compass sensor

Accelerometer, Proximity Sensor

FM radio

4Gb Flash & 2GB SDRAM

Max 32GB uSD- card

Android base sync applications

3.5 mm jack for headset

Micro USB connector

5 line QWERTY keypad




2. Block diagram overall.

The block diagram is similar to the BL40. The Camera controller circuits are very

similar to the BL40.

The major differences are listed below.

- There is 4 Gbit NAND flash and 2Gbit DDR SDRAM memory. There is no separate

multimedia I-NAND memory on the GW620.

- There is no RGB converter on this design. - The LCD module accepts MDDI data directly.

- There is no audio and video output on the 5 pin micro USB connector.

- The compass sensor is new and will be explained in the next slides.

- The receiver audio signals flow through the

subPCB.




3. ( Architecture) – Linux Kernel

Android is an Operating system + core applications for mobile devices

Android is open source software. This is a very important property.

With the exception of brief update periods, Android has beenavailable as open source since October 2008. Google opened the

source code under an Apache License.

With the Apache License, application developers are free to add proprietary extensions without submitting those back to the open

source community.

The Linux kernel is a so called abstraction layer for the hardware.

If we decide to use another microprocessor (another ARM or even another brand/architecture) only the Linux Kernel is different.

All other software can remain the same.




3. ( Architecture) – The Dalvik & The Libraries


The Dalvik virtual machine is right on

top of the Linux kernel. Applications

can be executed independent of each other; this is important for security.

However if an application puts the hardware in a certain status this

status will not necessarily be brought back to its initial state by the Dalvik

virtual machine when the application

ends.

The Libraries make it easy to

develop applications. The media framework for example contains a

library that is able to process most

audio and video formats like mp3, mpeg4, jpeg etc.

If you want to develop an application that modifies this type

of file you do not have to worry

about decoding the compressed media; the library will do that for

you.




3. ( Architecture) – The Applications


The application framework offers so called Application Programming Interfaces. This is a very

good way to let applications communicate (=interface) with each other.

A simple example: If you want to record some audio

you will have to tell the hardware to use a certain audio source (microphone), what media encoder

format (AMR_NB) and what type of output format (THREE_GPP) to use. This is done by using the

android media recorder API. You can see here that these APIs use the libraries to provide the

services.

The applications are written in JAVA language.

There are standard applications like contact shown in the picture but you can write your own

applications also.

An example of an application is toggle switch which will set unit in silent mode. Using the View system

you can create a toggle button.The button can be sensed and the output can be

sent to the Audio manager API. This can be done in a very small JAVA program.

Any person with basic programming skills can install

and develop such an application within a couple of hours !

Advanced users can and will use lots of applications.

Unlike the JAVA applications that you find for regular

LGE phones the Android applications may use parts of the hardware that are not used with the standard

software.Reproducing problems can be difficult in an

environment like this. See next slide also for some details.




4. What is new with Android system for LGE handsets

The SW architecture is fundamentally different from previous models

The GW620 uses Android version 1.5 (also know as Cupcake)

Although the S-Class user interface looks almost identical to

previous models all the software is completely different.Customers can come “much closer” to the hardware with

their own applications (designed themselves or downloaded).

A customer can download his own applications only through his

Google account (same as gmail account).In this account a customer can see his downloaded applications.

You cannot download applications from an SD-card or Computer so a flat fee data traffic contract with the service provider or good

WiFi connection is almost mandatory.

After a customer factory reset all the applications are gone

(just like with the engineering menu factory reset). However the applications are still visible in the “my

downloads” section in the Google account.

The android version on GW620 cannot be upgraded to 1.6 or

2.0/2.1 by customers.




5. Electronic compass: - Physics I.

The electronic compass in the GW620 measures the earth magnetic field.A hall effect sensor is used to measure the field.




5. Electronic compass: - Physics II.

When a current carrying conductor is placed into a magnetic field a voltage will be generated perpendicular to the current and the magnetic field.




5. Electronic compass: - Physics III.

When you measure the voltage VH of 3 hall effect sensors (X,Y and Z direction) the direction of a magnetic field can be determined.The voltage can be both positive or negative depending on the direction of the magnetic field.

The voltage is temperature dependent and in the microvolt range.




5. Electronic compass: - Block diagram

The electronic compass IC is a mixture of analogy and digital circuits.

The analogy circuits are required to amplify and analyze the very small signals that are induced by the earth magnetic field.

The digital interfacing and digital circuits are straightforward and contain standard elements for sensor ICs.

Calibration data includes temperature offset data.The display reading is compensated for the magnetic fields of the phone vibrator and speaker magnet with calculations.




6. Trouble shooting: General topics

A limited amount of trouble shooting is

covered in this presentation.

Only items that are missing or need additional explanation on top of the service

manual are covered.

An example of the android settings is the silent mode. If the phone is put in silent

mode with the user android settings menu you cannot test the ring in the engineering

menu sound test.

Also if a customer has downloaded an application that will mute the sound or

interferes with any other functionality this will affect the engineering menu

performance.The engineering menu itself is a set of JAVA

applications also..




7. Trouble shooting: Electronic Compass I.

The service manual does not take the Regulator test points into account.Experience shows that up to 10 degrees deviation of the compass is normal.

The Engineering menu contains a compass sensor test.

When the device is opened it may be more convenient to access a compass

application with one push on the touch screen.These compass applications can be downloaded for free. This type of

application is a good example of how accessible the hardware is. There is direct control by the application of the

android.hardware.SensorManager Application Programming Interface.




7. Trouble shooting: Electronic Compass II. 7. Trouble shooting: Electronic Compass II.

The compass sensor is on the main PCB on the QWERTY keypad side.

The COMPASS_INT and COMPASS_RESET are not accessible.

It can be convenient to use a little magnet to see if the sensor is working.

You get the best results if you hold the magnet ~ 3cm below the device at ~5 cm from where the compass sensor is and make a circle with a 10 cm diameter.To check the accuracy you really have to compare with a regular compass in the earth magnetic field so preferably somewhere outside a building an away from

any currents or magnets. Storage temperature of this IC = -40..+85 Celsius. Soldering must be done carefully.




• Industry Standards:http://www.android.com/index.html

• GW620: On the LGE web site

http://www.lge.com

http://www.lg.com/uk

8. Further information

You can find additional information on:




GW620 LG Intouch Max3D S-Class or ANDROID V1.5 user interface

QUALCOMM DBB MSM7200A

Training Guide

For LG Authorised Service Centers only do not copy or distribute!

GW620 Service Training V1[1].1

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