TCL Pixi4-6 3G Technical manual

L2 Repair Document TCLCommunication Ltd.
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Pixi4-6 3G
8050X_D_G&E
Note: this manual is non-contractual and TCL Communication Ltd. can modify it without prior
notice on the characteristics of described equipments.

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1.1
Update
1.0
2015-12-19
Draft creation
Mani Lee
Rev.
Date
Modification description
Prepared By
Checked By
Approved By

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Content
1Level 2E repair process............................................................................................4
2Warranty Check and Visual Inspection ...................................................................5
2.1 Warranty confirmation of L1.....................................................................................5
2.2 Visual mechanical check..........................................................................................6
2.3 Pretest........................................................................................................................6
3Battery......................................................................................................................11
3.1 Battery information.................................................................................................11
3.2 Battery test ..............................................................................................................13
3.3 Battery specification...............................................................................................14
3.4 WARNING of Battery disassembling .....................................................................18
4Software download .................................................................................................18
4.1. Equipments requested when download：............................................................18
4.2. Handset driver installation .....................................................................................18
4.3. SW download process............................................................................................19
5 Disassembly and assembly 8050E ............................................................................23
5.1 ESD Safety...............................................................................................................23
5.2 Disassembly tool.....................................................................................................23
5.3 Disassembly process...............................................................................................24
5.4 Reassembly process................................................................................................35
5.5 Disassembly process evaluation............................................................................35
6Disassembly Complete...........................................................................................35
7Level 2 repair...........................................................................................................36
8L2 Enhance repair...................................................................................................44
8.1 Position of L2 enhance components on PCBA ....................................................45
8.2 Trouble shooting for common failures..................................................................47
8.3 L2 enhance spare part list......................................................................................60
9PCBA exchange.......................................................................................................62
10 Other component exchange...................................................................................62
10 Function test............................................................................................................63

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1 Level 2E 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
L2E Repair
Retest
OK
NG

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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 ”Settings” -> “About phone” -> “Status” -> “IMEI/IMEI SV”
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.

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2.2 Visual mechanical check
Mechanical warranties check items:
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 and SD card are set correctly.
2) Power on the cell phone.
3) If the cell phone asks to input NCK code, this means it is SIM locked and can only be worked

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with dedicated SIM card. Use the correct SIM card.
4) Enter the phone code if necessary.
5) If power on, test step by step with the auto test code:
Open “Calculator” application, and input “0x0-0+=” to enter MMI test mode, and then you will
see the interface displaying the SW version and SN. Select “Auto” to start the auto test, or
select “MANU” to do the MMI test manually.
Traceability
I. You can get information such as BT, CU-REF, PTH ,MMI,etc.,
II. Press “pass” key to continue.
Touch Panel
II. “Please draw in the yellow area” according to instructions
III. Press “PASS” to continue.
RAW Data
I. You can see Raw data test is running;
II. Press “pass” key to continue;
LCD
I. You will see the LCD display three colors - RED, GREEN and BLUE - if it functions well;
II. Press “Pass” to continue.
III. You will see the LCD display greychart if it functions well.
IV. Press “Pass” to continue.
V. You will see the LCD display black if it functions well.
VI. Press “Pass” to continue.
VII. You will see the LCD display white if it functions well.
VIII. Press “Pass” to continue.
IX. You will see the LCD display grey if it functions well.
X. Press “Pass” to continue.
KEYPAD
I. You will see the key of the V+, V-, and power, click the corresponding key, then the key
turn gray on the screen.

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II. Press “Pass” to continue.
LCD BACKLIGHT
I. You will see the screen flash if it functions well
II. Press “Pass” to continue.
Main Camera
I. You will see the LCD displays the picture that back camera catch if it functions well;
II. Press “Pass” to continue;
Front Camera
I. You will see the LCD displays the picture that front camera catch if it functions well;
II. Press “Pass” to continue.
Charge Led
I. It will display “Please check charge LED" if it functions well.
II. Press “Pass” to continue;
Hall
Press “Pass” to continue if it functions well
AUDIO
I. You will hear piece of record if it functions well;
II. Press ”Pass” to continue;
MIC
I. Press “start “to record sound, and then press” Play” if it functions well
II. Press “PASS” to continue.
Sub MIC
I. Press “start “to record sound, and then press” Play” if it functions well
II. Press “PASS” to continue.
Vibrator
You can feel the vibration if it functions well.
Accessory
I. Insert the headset.

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II. You will hear one record in left discrete;
The “Volume Down “and “Volume Up” will display grey if it functions well.
III. Press ”Pass” ,you will hear one record in right discrete;
The “Volume Down “and “Volume Up” will display grey if it functions well.
IV. Press ”pass” to continue;
V. You will hear piece of record if it functions well;
VI. remove your headset
VII. Press ”Pass” to continue;
FM
I. You will hear the sound from on channel when you insert earphone if it functions well;
II. Remove the ear phone then press “Pass” to continue;
USB/ Charger
I. Insert USB cable according to instruction, then it will say “USB:OK Charger :OK” ;
II. Remove USB cable according to instruction
III. Press “Pass” to continue;
Virtual Proximity Sensor
I. It will display “Please shadow the touch panel “ ,and follow the instruction if it functions well.
II. Press “Pass” to continue;
G-Sensor
I. Put the handset up and towards up according to instruction;
II. Put the handset towards the directions indicated by instructions; it will say “All positions
checked” after you following all the directions if it if it functions well;
III. Press “Pass” to continue;
SIM
I. Insert SIM card and the phone will detect it if functions well;
II. Press “Pass” to continue;
Memory Card
III. Insert Memory card and the phone will detect it if functions well;

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IV. Press “Pass” to continue;
Battery Temperature
I. It will display “Battery temperature should between: 20~50”, “current is xxx”
“Battery content should between: 30~80%”, “current is xxx”
“Battery Voltage is 3.704V”, “Battery Present is xxx” if it functions well;
II. Press ”Pass” to continue;
BLUETOOTH
I. Bluetooth will search automatically and it will display device address if it functions well;
II. Press ”Pass” to continue;
WIFI
I. It will search for WIFI hotspot and display searched result on the screen if it functions well;
II. Press”Pass” to continue;
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;
II. Press”Pass” to continue;
Network
I. Insert SIM card and follow the instruction if it functions well.
II. Press”Pass” to continue;
Calling
I. It will automatically call the emergency call if it functions well.
II. Press “Pass” to continue;
Battery ctrl
I. You will see the battery status information.
II. Press ”Exit” to continue;
Factory Reset
It will do the factory reset automatically if you press the item.
EXIT