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X190B Repair ManualX190B Repair Manual

LONGCHEER CONFIDENTIAL

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Agenda

Product profile

Disassembly guide

Trouble shooting

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Product ProfileProduct Profile• LongCheer model ： MDR_X190B• Customer model:DS185• Platform ： MTK6225• Battery ： 1000mA （ Charger:

travel type 、 Data cable: 8pin 、 Earphone: 8pin ）

• LCD ： 2.2’ 　 Resolution:176＊ 220 　 65K 　 TFT

• Camera ： 2M (SENSOR TYPE:CMOS)

• Frequency Band ： GSM900 　 DCS1800

• Ring ： 64 chord• Support ： T-Flash 、 MP3 、 M

P4(REC ）、 FM• Support ： GPRS （ Class12) 、

WAP 、 Blue Tooth(BT1.2)• Support ： MMS 、 SMS• Support: Flashlight (double LE

D)

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Disassembly guideDisassembly guide

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1. 1. Tools PreparationTools Preparation

Nipper / Cross screwdriver / Soldering iron /Filmy plastic card/MultimeterNipper / Cross screwdriver / Soldering iron /Filmy plastic card/Multimeter

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2. Battery Cover and Front Cover disassembly 2. Battery Cover and Front Cover disassembly Disassembly Instruction:

Remove battery cover as below picture 1. Remove 2pcs rubber stopper and 6pcs screw by nipper as below picture2. then remove front cover by hand, please refer to the below picture 3 and picture 4.

Picture 1

Picture 2

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LCM

Front

Assembly

Keypad

Receiver

Keypad DOME

Picture 3

Picture 4

2. Battery Cover and Front Cover disassembly 2. Battery Cover and Front Cover disassembly

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Disassembly Instruction: Pull main board in rear cover by nipper. Please attend between LCD 、 speaker and rear cover as below picture 5 and 6.

Rear Cover

Assembly

Speaker /

Antenna

Assembly

CameraBattery connector

SIM Card

Base

T-Flash Card

Base

I/O Connector

3. Main Board and Rear Cover disassembly 3. Main Board and Rear Cover disassembly

Picture 5

Picture 6

Vibrator

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Disassembly Instruction: Remove LCM in main board by nipper, then dilacerate insulated Mylar of LCM by hand. Andthen take up the LCM and camera by soldering iron as below picture 7.

Please attention: When dilacerate in insulated Mylar of LCM by hand, please force uniform.

LCM

ConnectionSoldering iron

4. LCM Assembly Disassembly 4. LCM Assembly Disassembly

Picture 7

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Disassembly Instruction:

Remove speaker in main board by nipper( please refer to below red circle on the picture

8), then take down speaker of cable in main board by soldering iron,

And then take up the camera by soldering iron as below picture 8.

Speaker

cable of weld

Camera

Connection

Speaker

cable of weld

5. Antenna5. Antenna 、、 Speaker Speaker 、、 Motor Motor 、、 Camera disassembly Camera disassembly

Picture 8

Flashlight LED

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Bluetooth chip

NandFlash chip

26MHz crystal

Transceiver

RF　 Switch

RF PA

PMU

CPU Bearing sensor

SIM Controller

FM Chip

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三、三、 Trouble shooting for Repair and TestTrouble shooting for Repair and Test

1. Display Abnormal (display back/white1. Display Abnormal (display back/white 、 、 display disorder etc)display disorder etc)

a. Upgrading software b. LCM whether break, and FPC whether rupture.c. Re-soldering connection of FPC cabled. Replace a new LCM and to do double test.e. Measure LCM connection by multi-meter as below picture 9.f. If can’t repair yet, please refer to level 3 repair manual.

Control SignalData Signal

LED SignalTouch Panel

Signal

Reset Signal

Picture 9

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3. No ring tone and Receiver no toneNo ring tone and Receiver no tone 1)No ring tonea. Check speaker SMT issue, and re-soldering.b. If cable OK, need to replace a new speaker .c. Check component of speaker circuit on main board as below picture 10.d. If can’t repair yet, please refer to level 3 repair manual.

2) Receiver no tone a. Check whether touch ok between receiver connection’s PIN and PAD of main board, we can adjust PIN of

receiver to confirm.b. Replace a new receiver and to do double test.c. Check component of receiver circuit on main board as below picture 11.d. If can’t repair yet, please refer to level 3 repair manual.

Receiver Circuit　 Speaker Circuit

　

Speaker Circuit 　

Trouble shooting for Repair and TestTrouble shooting for Repair and Test

Picture 10 Picture 11

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4. No receiver and No vibrator1)No vibratora. Check whether touch ok between vibrator and main board. b. Replace a new vibrator and to do double test.c. Check component of vibrator circuit on main board as below picture 12.D. If can’t repair yet, please refer to level 3 repair manual.

2)No receivera. Check MIC SMT issue and re-soldering.b. Replace a new MIC and to do double test.c. Check component of MIC circuit on main board as below picture 13.d. If can’t repair yet, please refer to level 3 repair manual.

Vibrator Circuit

MIC Circuit

Trouble shooting for Repair and TestTrouble shooting for Repair and Test

Picture 12 Picture 13

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5. No Signal or Weaka. Check shrapnel of antenna weather touch ok with main board, if can’t please re-fix.

b. please measure signal receiver circuit between SA100 and W100 by multimeter as below picture 14.

c. If can’t repair yet, please refer to level 3 repair manual.

Trouble shooting for Repair and TestTrouble shooting for Repair and Test

Picture 14

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6. Camera failed (Display abnormal 、 Display distortion)a. Clear camera lens and re-soldering the camera connector.

b. Replace a new camera.

c. Check below location of picture 15 component whether OK.

d. If can’t repair yet ,please refer to level 3 repair manual.

Trouble shooting for Repair and TestTrouble shooting for Repair and Test

Picture 15

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7. Keypad Failed (No respond 、 No function)a. Check keypad DOME for one keypad abnormal or clean the keypad.a. Check keypad DOME for one keypad abnormal or clean the keypad.b. Check connector of keypad as below picture 16 ( Red b. Check connector of keypad as below picture 16 ( Red circle) circle) for one line keypad abnormal.for one line keypad abnormal.c. Replace a new keypad .c. Replace a new keypad .c. If can’t repair yet. Please refer to “level 3 repair manual”.c. If can’t repair yet. Please refer to “level 3 repair manual”.

Trouble shooting for Repair and TestTrouble shooting for Repair and Test

Picture 16

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Thanks for you attenti

on!