TCL Idol4 S VF Technical manual

L2 Repair Document TCLCommunication Ltd.
Rev.
VFD 900 Level 2 Repair Document
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Idol4 S VF
VFD 900
Note: this manual is non-contractual and TCL Communication Ltd. can modify it without prior
notice on the characteristics of described equipments.

L2 Repair Document TCLCommunication Ltd.
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VFD 900 Level 2 Repair Document
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1.3
2016/8/29
Update
Xiaolong Yang
1.1
2016/5/3
Update
Xiaolong Yang
1.0
2016/3/28
Draft creation
Xiaolong Yang
Rev.
Date
Modification description
Prepared By
Checked By
Approved By

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Content
1Level 2 repair process ..............................................................................................5
2Warranty Check and Visual Inspection ...................................................................6
2.1 Warranty confirmation of L1.....................................................................................6
2.2 Pretest........................................................................................................................8
3. Battery......................................................................................................................17
3.1 Battery information.................................................................................................17
3.2 Battery test ..............................................................................................................19
3.3 Battery specification...............................................................................................20
4. Software download .................................................................................................21
4.1 Equipments requested when download.................................................................21
4.2 Install driver..............................................................................................................21
4.3 SW download process.............................................................................................22
5 Disassembly and assembly VFD 900.......................................................................26
5.1 ESD Safety................................................................................................................26
5.2 Disassembly tool......................................................................................................26
5.3 Disassembly process...............................................................................................27
5.4. Reassembly Process ..............................................................................................43
5.5. Disassembly process evaluation...........................................................................51
5.6. Disassembly Complete...........................................................................................52
6Level 2 repair...........................................................................................................54
6.1 power on issue.........................................................................................................55
6.2 Charge issue.............................................................................................................56
6.3 Display issue ............................................................................................................57

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6.4 Vibrator issue ..........................................................................................................58
6.5 Touch panel issue...................................................................................................59
6.6 SIM recognize issue................................................................................................60
6.7 TF card recognized issue.......................................................................................61
6.8 Main camera issue ..................................................................................................62
6.9 Sub camera issue....................................................................................................63
6.10MIC issue .................................................................................................................64
6.11Speaker issue..........................................................................................................65
6.12USB connector issue..............................................................................................66
7PCBA exchange.......................................................................................................66
8Other component exchange...................................................................................67
9 Function Test...............................................................................................................67
APPENDIX 1 Packaging Requirements ........................................................................69

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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.
Humidity sensitive sticker is near the SIM card tray.
Visual mechanical check

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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

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9) Others
Damage caused by disassembly ,wrong part assembly, loss of components
Use in abnormal environment like high temperature causing plastic melts
2.2 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.
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. You can get some information such as IMEI, CU-REF, PTM, Date Code, etc.

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II. Press “Pass” to continue.
SMARTPA CAL
I. It will running the test automatically and show “TOP OK; BOTTOM OK; SmartPA Test
PASS” if it functions well;
II. Press “Pass” to continue.
SpeakBOX
I. It will run the test automatically and show “TOP OK; BOTTOM OK; SpeakerBox Test PASS”
if it functions well;
II. Press “Pass” to continue.
Finger Print
I. It will run the test automatically and show ”Test passed”if it function well；
II. Press “Pass”to continue.
Finger Print Enroll
I. Please touch and lift your finger on the sensor, it will show ”Quality: Good” if the function is
OK.
II. Press ”pass”to continue.
Raw Data
I. It will running the test automatically, don‟t touch the screen during test and it will show
“Pass” if it functions well;
II. Press “Pass” to continue.

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Touch Panel
I. “Please draw on the yellow area” according to instructions;
II. Press “Pass” 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 displays grey level if it functions well;
IV.Press “Pass” to continue;
V. You will see the LCD displays black if it functions well;
VI.Press “Pass” to continue;
VII. You will see the LCD displays white if it functions well;
VIII. Press “Pass” to continue;
IX.You will see the LCD displays grey if it functions well;
X. Press “Pass” to continue.
Keyboard
I. Press the key displayed on the screen. The key on the screen will turn grey when you
press it if it functions well;
II. Press “Pass” to continue.
LCD Backlight