l2 repair document tcl communication ltd. pixi3-4rsh.a-novo.com/userfiles/file/pixi3 4.5 - one touch...

L2 Repair Document TCL Communication Ltd.

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4027A_D_N_X _&4028A_E_J Level 2 Repair Document

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All rights reserved. Transfer, copy, use or communication of this file is prohibited without authorization.

Pixi3-4.5

4027A_D_N_X &4028A_E_J


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Note: this manual is non-contractual and TCL Communication Ltd. can modify it without prior

notice on the characteristics of described equipments.

1.0 Draft creation Wilson li Alex Lin

Rev. Date Modification description Prepared By Checked By Approved By


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Content

1 Level 2 repair process .............................................................................................. 4

2 Warranty Check and Visual Inspection ................................................................... 5

2.1 Warranty confirmation of L1..................................................................................... 5

2.2 Visual mechanical check .......................................................................................... 5

2.3 Pretest ........................................................................................................................ 6

3 Software download ................................................................................................... 7

Equipments requested when download： ......................................... 错误!未定义书签。

Handset driver installation： ............................................................... 错误!未定义书签。

SW download process ......................................................................... 错误!未定义书签。

4 Disassembly and assembly 4027A ............................................................................ 11 4.1 ESD Safety ................................................................................................................ 15

4.2 Disassembly tool ...................................................................................................... 15

4.3 Disassembly process ............................................................................................... 15

4.4 Reassembly Process .............................................................................................. 25

4.5 Disassembly process evaluation ........................................................................... 26

5 Disassembly Complete ........................................................................................... 27

6 Level 2 repair ........................................................................................................... 38

7 PCBA exchange ....................................................................................................... 39

8 Other component exchange ................................................................................... 39

9 Final test ........................................................................................ 错误!未定义书签。

APPENDIX 1 Packaging Requirements ............................................... 错误!未定义书签。


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1 Level 2 repair process

Reassembly

Record in BIG

End

OK

Retest

OK

OK

Start

Visual Inspection

Warranty Check

Pretest & Failure confirm

SW Upgrade

Disassembly

L2 Repair

Retest

Function test

PCBA Replace

NG

NG

NG

Restore User Information

Back up user data


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2 Warranty Check and Visual Inspection

2.1 Warranty confirmation of L1

IMEI sticker check:

1) Power on the handset, enter *#06#

2) If the IMEI sticker in the back casing is not lost:

We should make sure that the IMEI number MUST be the same with the one on the IMEI sticker; if

not, it’s out of warranty policy.

Humidity sensitive label

If humidity sensitive label is not good, the cell phone will be considered as out of guarantee.

1). Liquid was detected by humidity sensitive label.

2). Position of humidity sensitive sticker.

2.2 Visual mechanical check

Mechanical warranties check items:


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1) Corrosion

Corrosion on the USB connector, SIM connector, and other metal surfaces。

2) Hole (diameter > 1mm)

Holes on any surface, including the front casing, furnished frame, battery cover, touch Lens,

keypad…

3) Bump

Bumps (diameter > 1mm) on any surface, including front casing, decorate frame, battery

cover, touch Lens, keypad, etc.

4) Scratch

Scratches (length > 3mm) on any surface, including the front casing, decorate frame, battery

cover, touch Lens, keypad, etc.

5) Distortion

Bend, twisted or crushed on the h/s, cover/casing or connectors, etc.

6) Broken

Touch broken, casing/cover broken, etc.

7) Dropped

Keypad tear off, touch lens, connectors dropped, etc.

8) Gap

External physical damage relating to abnormal use, like front case and frame opened

9) Others

Damage caused by disassembly ,wrong part assembly, loss of components

Use in abnormal environment like high temperature causing plastic melts

2.3 Pretest

1) Check that the SIM card is set correctly.

2) Insert the battery.

3) Power on the cell phone.

4) If the cell phone cannot power on, visually check the condition of the battery connector. Replace

it if necessary.


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5) If the cell phone asks to input NCK code, this means it is SIM locked and can only be worked

with dedicated SIM card. Use the correct SIM card.

6) Enter the phone code if necessary.

7) Enter auto test in power off mode:

8) Press *#2886# in dial screen and then you will see the interface displaying the SW version.

Select “Auto” to start the auto test, or select “MANU” to do the MMI test manually.

If one of the test failed during “Auto” test mode, it will ask you “Restart?”, press “YES” to restart the

auto test from the first one and “NO” to exit the auto test, while “NEXT” to continue the auto test.

Traceability

I. (1) “Auto” test mode: You can get some information such as PT,PFT, BW, MMI

and FT;

(2) “MANU” mode: You can get information such as IMEI, CU-REF, WIFI, BT

address, etc.

II. Press “Pass” to continue.

TP

I. It will test the TP raw data automatically and it will show “FT Rawdata test result:

Pass” if it functions well;

II. Press “Pass” to continue;

III. Please draw on the yellow area and it will show “TEST RESULT OK!”;

IV. Press “Pass” to continue;

V. Please draw on the yellow area and it will show “TEST RESULT OK!”;

VI. Press “Pass” to continue

LCD display

I. You will see the LCD display three colors: RED, GREEN and BLUE if it

functions well;


III. You will see the LCD displays black if it functions well;


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V. You will see the LCD displays grey if it functions well;

VI. Press “Pass” to continue;

VII. You will see the LCD displays grey level if it functions well;

VIII. Press “Pass” to continue;

IX. You will see the LCD displays white if it functions well;

X. Press “Pass” to continue.

Keypad

I. Press the key displayed on the screen. The key on the screen will darken when

you press it if it functions well;

LCD backlight

I. The screen backlight will be flashing if it functions well;


Camera

I. Press “Pass” to continue if the main camera functions well.

II. Press “Pass” to continue if the front camera functions well

III. Press “Pass” to continue if the camera LED functions well

IV. Press “Pass” to continue if the charger LED functions well

Audio

I. You will hear a voice prompt which introduces some emergency call numbers

from receiver if it functions well;


III. You will hear a voice prompt which introduces some emergency call numbers

from speaker if it functions well;


V. Put the handset near your ear and make a noise near the MIC, then you will


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hear it from receiver if it functions well;

VI. Press “Pass” to continue.

Vibrator

I. You can feel the phone’s vibrating if it functions well;


Accessory

II. Insert headset according to the instruction and you will hear a voice prompt

which introduces some emergency call numbers through the headset left if it

functions well;

III. Press “Pass” to continue;

IV. You will hear a voice prompt which introduces some emergency call numbers

through the headset right if it functions well;

V. Press “Pass” to continue;

VI. Make a noise near the headset’s mic and you will hear it from headset if it

functions well;

VII. Press “Pass” to continue.

VIII. You will hear FM playing and FM frequency will be displayed on the

screen if it functions well;

IX. Press “Pass” to continue;

X. Remove headset according to instruction.

Charger

I. Insert USB cable according to instruction, it will detect it and say “Charger: OK”

if it functions well;


III. Remove USB cable.

USB

I. Insert USB cable according to instruction, it will detect it and say “USB: OK” if it


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functions well;

II. Remove USB cable according to instruction.

G-sensor

I. Put the handset up and towards up according to instruction;

II. Put the handset “face up”, “face down”, “left” and “right” , towards “down”

according to instruction;

Proximity Sensor

I. Please shadow the sensor according to instruction.

SIM

I. Insert SIM card and the phone will detect it if it functions well;


SD card

I. Insert SD card and the phone will detect it if it functions well;


Battery

I. It will display the value of battery temperature, battery content, current Voltage

if it functions well;


Bluetooth

I. Bluetooth will search automatically and it will display device address if it

functions well;

Wi-Fi

I. It will search for WIFI hotspot and it will display searched result on the screen if it functions

well;

GPS

I. It will run GPS and search for satellite, and then it will display info such as “PRN”, “SUR”,

etc. on the screen if it functions well;


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II. Press”Pass” to continue;

3 Software download

It is authorized to download software for the handset which needs to be updated. This

downloading tool is called “Sugar MTK_SP”. Handset Software can be downloaded from

TS website via it. Thus internet access is necessary.

TS Website: https://css.tclmobile.cn/.

1.1. Equipments requested when download：

⑴ A handset with full power;

⑵ PC with windows system;

⑶ A USB cable.

1.2. Handset driver installation

Double click to install the Sugar MTK_SP, then select the “Install driver” check box for the driver installation.

https://css.tclmobile.cn/


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1.3. 4.3 SW download process

I. Login the Sugar MTK_SP, then select the 4027 model:

II. Click the button ”Get Version” to check the SW version of the headset


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III. Click the “Upgrade” button, disconnect the USB cable, then insert USB cable again

Online upgrade process starting:

IV.Upgrade finished:


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Note: During the download progress a warning window will prompt as below if the phone has been rooted before.

If the phone has been rooted, it means that the phone is out of warranty. End users need

to pay to upgrade, otherwise click "No" to exit the upgrade.


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4 Disassembly and assembly 4027A

4.1 ESD Safety

Please wear static loop or static glove

4.2 Disassembly tool

You may use the following tools during the disassembly and reassembly procedure:

4.3 Disassembly process

The steps of disassembly 4027A are as below.

Step1: Take off battery cover and battery by using the plastic flake.

Plastic Flake Tweezers Screwdriver

(TORX6)

Soldering iron

Suction cups Hot wind gun


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Step2 : take off 8 screws on the furnished frame ,then separate it by using plastic flake


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You can separate Vibrator from furnished frame.

Step 3: disconnect the main/front camera, TP/LCD


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Step 4: Separate the main board by using the plastic flake.


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Step 5: separate speaker by using iron soldering. Separate receiver by using tweezers.


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Step 6: separate cover lens, first apply the hot air, then separate it by using suction cup and plastic

flake


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Note: for the details of this step, please refer to the video “how to separate cover lens”

Step 7 separate the TP/LCD by using plastic flake:

Note: When you finish replacing, use the furnished fcasing to locate in order to assemble the LCD. And

then assemble the TP Cover Lens.


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Step8 Disassemble complete.

4.4 Reassembly Process

Please make reference to the disassembly process for assembly reverse an order of the disassembly

steps.

Attention:

When assembling Furnished frame, make sure the TP FPC, LCD FPC and Slide key FPC

connected firstly.

There are 2 kinds of different screws when assembling screws, please do remember to distinguish

them.

Before assembling furnished back cover, please check whether there’s any deformation or damage

for the buckles; if yes, replace it with a new furnished back cover.

When assemble the LCD/TP, please assemble the LCD/TP first, then change the new back glue of

cover lens, finally fit on the cover lens


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4.5 Disassembly process evaluation

We list the Pixi3-4.5 4027A parts disassembly time, technique levels and disassembly methods as below,

for technique levels, Class 1 signifies easy to disassembly, Class 2 signifies normal to disassembly and

Class 3 signifies hard to disassembly.

Spare part Time for

disassembly Jigs for

disassembly Difficulty Class Remark

Furnished battery cover 2s Class 1

Battery pack 2s Class 1

Screws 8s Screwdriver Class 1

Furnished frame 5s Plastic Flake Class 2

BTB connector 2s Tweezers Class 1

Main PCBA 15s Tweezers Plastic Flake

Class 2

LCM 5s Plastic Flake Class 1

Camera 2s Plastic Flake Tweezers

Class 1


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Receiver 2s Tweezers Class 1

Slide key FPC 3s Tweezers Class 1

Vibrator 3s Tweezers Class 1

Speaker 3s Tweezers Soldering iron

Class 1

TP 80s Hot wind gun Plastic Flake

Class 2

Furnished front casing 80s Hot wind gun Plastic Flake

Class 2

5 Disassembly Complete

Explored view

Below table lists4027A/D/N/X _4028A/E/J L2 spare parts. You could also refer to:

https://css.tclmobile.cn/.

https://css.tclmobile.cn/


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6 Level 2 repair

This chapter describes the Level 2 repair that can be done without any diagnostic equipment.

Problem description Action And Solution

Charging Bad

or

No Charge

1.Check voltage of the battery: if 0V, charge

some minutes and check the charge indicator;

2.Check the battery contact, change the

battery connector if broken;

3.Check the charge plug on B cover, change it

if necessary;

Switch on with

battery power

Can ‘t Switch on 1.Check voltage of the battery;

2.Check the battery contact, change the

battery connector if broken;

3.Check the power on key;

4.Check BTB connector socket pin

Main display Missing line or column; no

display; bad or no LCD

Check Connection flex (FPC cable),change it

if necessary;


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backlight Replace display module if necessary;

Vibrator The vibrator does not work Check the contact on the PCBA (dirty or

oxidized), replace the vibrator if necessary;

Network Problem No emission or No reception Check the antenna contactor on the B cover;

Check the contact on the PCBA (dirty or

oxidized);

Camera Camera doesn't work Check camera module

Check also camera socket broken or not

Audio Bad or no emission (TX

audio from mobile);

Bad or no reception (RX

audio on mobile);

Hands-free problem;

Key beep and melody

problem

Check microphone, replace it if necessary;


oxidized)

Check loud speaker, replace it if necessary;


oxidized)

In case the Level 2 repair can’t solve the problem, or the PCBA is damaged, exchange the PCBA.

7 PCBA exchange

If Level 2 repair does not solve the failure, it is mandatory to change the PCBA and follow the process as

below.

1) Collect the PCBA (without accessories, LCD and camera).

2) Get a new PCBA from the swap stock. Reuse those accessories to assemble the mobile.

3) Fill in the record sticker with IMEI number, fault code, short code, Hardware Technical Level and

software version.

4) Send the NG PCBA with record sticker back to L3 repair center with the recommended packaging

method,

Note: packaging method please refer item “APPENDIX 1 Packaging Requirements”.

8 Other component exchange

The other components exchange such as

1) LCM

2) TP


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3) Antenna spring

4) Slide key FPC

5) Vibrator

6) Speaker

7) Camera

8) Receiver

9) Other related mechanical components

Please follow the detail steps 4.3 (Disassembly and assembly process).

But need to be very careful to handle the components with related special tool or jig (especially replacing

new components)

It is better to handle it with plastic tools (plastic tweezers and wedge etc.).

Besides operator must wear anti-static gloves, fingertips or wear static loop during the whole process of

components exchange.

Function Test

During the function test, the following items must be checked and validated.

1) Cosmetic aspect of the handset,

2) The Software Technical sticker state on the Board

3) Switch on the handset

4) Default welcome message

5) Press *#2886# on the idle screen to start the auto test

1. Any L3 PCBA which has appearance like below cases is not acceptable.

1) The PCBA which shielding cover is rusty or distortion, copper peel off;

×


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2) Smudge on PCBA, such as soldering flux, rudimental glue, handwriting, burn, scratch and so

on ;

× ×

×

×


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3) Symptom sticker, high temperature adhesive or nonstandard label on PCBA; Note:

a. Nonstandard label means broken label, label with handwriting, dirty label, label pasted in the wrong place, etc.

b. L2E label, IMEI label and BSN sticker are acceptable to be kept on PCBA only under the condition that these labels are intact, clean and smoothly pasted in the right place)

×

×

×

×


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4) PCBA with liquid or mildew.

2. Packing requirements

a) Wrap PCBA with anti-static bag

Note: please keep the anti-static bag clean and intact, especially not to paste any label on it.

×

×


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b) Choose box according to shipping quantity. Each slot usually put 4 or 5pcs. (4pcs for big one and

5pcs for small one). Meanwhile, use Wrinkled tape (marking the material code and qty) to distinguish the PCBA of different code.

c) Put this box into a bigger carton and put a cardboard on top (this is to avoid the PCBA to drop around during transportation)

d) Symptom list of all returned PCBAs is requested (refer to below table). Please send the electronic edition to all relevant receivers/departments. If possible, put the hard copy Excel file of L3 PCBA Symptom description into the carton.

No. Country Project Name

Commercial Reference

IMEI (SN) Symptom decription

Symptom code

1 (eg.)

SPAIN Pisco 916X-

2AYGES1 862387010987343

can't power on

TON

√ ×


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If you have any question or problem, please feel free to contact us

Thanks for your cooperation.

TCL Communication Ltd.

Global Customer Service TS Dept.

Apr 2th, 2015

l2 repair document tcl communication ltd. pixi3-4rsh.a-novo.com/userfiles/file/pixi3 4.5 - one touch...

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