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Technical Document Name: Model K455 Mobile Phone Maintenance Instructions
Technical Document No.:
Version: V1.0
Amendment Record:
Document No.
Note 1: Fill this table when documents are amended and filed every time.
Note 2: The answers for the columns of Reasons for Amendment and Main Amendment Contents should
be NONE when the document is firstly filed.
QD0094
All information showed in this document belong to Huaqin Co., Ltd. Do not disclose any information to
the third party or person without prior approval.
V1.0
Technical Document
(Including front cover)
Made By:
Checked By:
Countersigned By:
Standardized By:
Approved By:
Shanghai HuaQin Telecom Technology CO., Ltd.
Made or
Version
Revised by
V1.0
Tan Riping
23 Pages
Tan Riping
Date
Reasons for
of Making or
Amendment
Amendment
2009/08/27
Security Level: Confidentiality
Main
Amendment
Contents(Only
showmain oints)
None
None
Page 1 of 25
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Table of Contents
Related Manuals for HQ K455
Summary of Contents for HQ K455
- Page 1 Security Level: Confidentiality Technical Document Technical Document Name: Model K455 Mobile Phone Maintenance Instructions Technical Document No.: Version: V1.0 23 Pages (Including front cover) Made By: Tan Riping Checked By: Countersigned By: Standardized By: Approved By: Shanghai HuaQin Telecom Technology CO., Ltd.
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Page 2: Table Of Contents
Security Level: Confidentiality Contents 1 Assembly and Disassembly Instructions 1.1 Attached Drawing of Complete-machine Assembly Process 1.2 Disassembly Instructions 2 Common Failures Analysis and Troubleshooting Flow Chart 2.1 Failures on Structural Elements 2.2 Non-starting up Failure 2.3 Non-ringing Failure 2.4 Abnormal Displaying on LCD 2.5 Abnormal Charging 2.6 Abnormal Photo-taking and Video-making 2.7 Non-recognizing SIM Card... -
Page 3: Assembly And Disassembly Instructions
Security Level: Confidentiality 1 Assembly and Disassembly Instructions 1.1 Attached Drawing of Complete-machine Assembly Process （1） take screw Cover、RF Cover、Battery cover screw Cover and RF Cover Directly to the upturned，Be careful not to scratch the shell。remove the battery cover screw Cover battery cover RF cover （2）... - Page 4 Security Level: Confidentiality （4） Demolition Main board first Relax Card Hook，The Main board and C Shell Separation，Shown to the right，Gently moving card hook，The master FPC motherboard removal。 hook （5） Demolition See the left picture，In accordance with the direction of the arrow，Shall SIM Card separated，SIM card connector PCBA Welded Demolition （6）...
- Page 5 Security Level: Confidentiality （7） Demolition MIC and Motor Iron Melting MIC and Motor Pad On Solder，Demolition MIC and Motor。 Motor Pad （8） Demolition Number keys DOME First, the number buttons on the removal of conductive foam，And then gently removed to expose the motherboard DOME （9）...
- Page 6 Security Level: Confidentiality （10） Demolition B Shell See the left picture，First of all demolition B shell screw cap，And then demolition B Shell the of the two screws，Reference picture gently moving the demolition B shell。 B Shell Screw cap （11） Demolition Slide See the Next picture，4 Slide screw Demolition，Slide the final demolition.
- Page 7 Security Level: Confidentiality （12） Demolition Keyboard Stand and Magnet See the left picture, According to the arrow direction, gently moving, removal of the keyboard bracket； Then, Demolition Keyboard Stand Back Magnet Magnet （13） Demolition Main FPC See the left picture，First Gently Demolition FPC Conductive Fabric，See the Right picture，Arrow Direction，And then gently moving cable buckle，Demolition Main FPC。...
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Page 8: Disassembly Instructions
Security Level: Confidentiality （15） Demolition camera and Speaker See the Right picture，Iron melting camera pad, plus tin, and then drag, demolition camera。See the left picture，Facing the speaker pads, direct the demolition speaker. Speaker pad Camera pad （16） Demolition LCD Along the edge of LCD，one side of lcd is not smooth，Camera directly to the demolition。 Assembly Instructions Assembly process is opposite to Disassembly process... -
Page 9: Failures On Structural Elements
Security Level: Confidentiality Common mistakes analysis flow chart 2.1 Mechanical mistakes Please refer to the Uninstall processing change the parts. 2.2 Non-starting up Failure Failure to starting Check the battery mounted correctly& Properly Re-mount it battery voltage >3.4V? & charge the battery Re-weld Check If the LCD and the mainboard are connector... -
Page 10: Non-Ringing Failure
Security Level: Confidentiality 2.3 Non-ringing Failure Non-ringing Re-weld Check if the speaker wires are in Speaker poor solder Replace with new one & Mark Replace with a new speaker failure Speaker Repair it Referring Check if the speaker circuit short circuit maintenance manual or open circuit of the mainboard... -
Page 11: Abnormal Displaying On Lcd
Security Level: Confidentiality 2.4 Abnormal Displaying on LCD Abnormal LCD Display Replace with Check If the lcd be damaged Weld Check if the lcd connector in poor solder connector Check If the LCD is intervened with the Re-mount the lcd Mechanical part Reference Replace with the new mainboard... -
Page 12: Abnormal Charging
Security Level: Confidentiality 2.5 Abnormal Charging Abnormal Charging Change the battery Replace with the new battery or charger or charger Check if the charger connector in poor Weld the connector solder Repair it Reference to Repair the charging circuit of maintenance the mainboard manual... -
Page 13: Abnormal Photo-Taking And Video-Making
Security Level: Confidentiality 2.6 Abnormal photo Abnormal photo Camera FPC damage Change camera Assembly again Camera FPC not solder correctly on UB Link FPC damage Change Link FPC Check the camera circuit Reference to the maintenance manual of the UB mainboard Replace with the new mainboard Reference to the maintenance manual of the mainboard... -
Page 14: Non-Recognizing Sim Card
Security Level: Confidentiality 2.7 Non-recognizing SIM Card Non-recognizing sim card If the SIM card is inserted correctly Change the SIM card Check if the SIM connector has poor Re-weld solder connector Repair it Reference Check if the sim circuit to the maintenance manual damaged mainboard... -
Page 15: No Reply Or Unable To Record Sound (With Ringing)
Security Level: Confidentiality 2.8 No Reply or Unable to Record Sound (with Ringing) No Reply or Unable to Record Sound(with Ringing) Re-weld or change Check if the mic is in poor solder the MIC Check if the mic hole be stoppaged Clean the mic hole Repair it Reference... -
Page 16: Failure On Push Number Key
Security Level: Confidentiality 2.9 Failure on numeric keypad Failure of the numeric keypad Check if the demo is placed correctly or if Re-mount or clean it there is any foreign material on its surface Check if the sidekey in poor solder or Re-weld or clean it short circuit If the structure is intervened with the... -
Page 17: Failure On Push Function Key
Security Level: Confidentiality 2.10 Failure on functional keypad Failure of the functional keypad Check if the demo is placed correctly or if Re-mount or clean it there is any foreign material on its surface Check if the sidekey in poor solder or Re-weld or clean it short circuit If the structure is intervened with the... -
Page 18: Receiving Or Silent Speaker
Security Level: Confidentiality 2.11 No Receiving Radio or Silent Speaker No Receiving Check if the receiver is in poor solder Re-weld the receiver Replace with the new Receiver Change the Receiver Repair it Reference to the Check if the receiver circuit is damaged maintenance manual of the mainboard Replace with the new mainboard... -
Page 19: Non-Vibration Or Abnormal Vibration
Security Level: Confidentiality 2.12 Abnormal vibrate or no vibrate Abnormal vibrate or no vibrate Check if the Moto is in poor solder Re-weld the MOTO Replace with the new MOTO Change the MOTO Repair it Reference to the Check if the MOTO circuit is damaged maintenance manual of the mainboard Replace with the new mainboard... -
Page 20: No Receiving Radio
Security Level: Confidentiality 2.13 No receiving of headset Radio No receiving of headset Radio Repair the headset Check if the headset is damaged or change w i t h a new one Re-weld Check if the headset connector of the connector mainboard is in poor solder Check if there is any foreign body in the... -
Page 21: No Bluetooth
Security Level: Confidentiality 2.14 No Bluetooth No signal Re-mount and Keep Check if The antenna poor contact them good contact Reset to the normal mode Check if the bluetooth is OK Repair it Referrence to the Check if RF circuit is damaged maintenance manual of the mainboard Mark the failure mainboard... -
Page 22: No Signal
Security Level: Confidentiality 2.15 No signal No signal Re-mount and Keep Check if The antenna poor contact them good contact Reset to the normal Check if the handset is in fly mode mode Repair it Referrence to Check if RF circuit is damaged the maintenance manual of the mainboard Mark... -
Page 23: Non-Recognizing T Card
Security Level: Confidentiality 2.16 Non-recognizing T Card Non-recognizing T Card Properly Check if the T card be inserted inserte correctly T card Change with the new Check if the T card is damaged card connector of Weld the connector of T-flash Check if the T-flash damaged... -
Page 24: Failure On Earphone
Security Level: Confidentiality 2.17 Failure on Earphone Failure on Earphone Repair the earphone or Check if the USB interface of the Change with a new one earphone in poor Solder or open circuit Weld the usb interface Check if the USB interface of mainboard in poor Solder Check if the earphone interface have Clean the foreign body... -
Page 25: Slide Invalid
Security Level: Confidentiality 2.18 Slide invalidation Slide invalidation Check if the slide screw is not stable Assembly again Check if the slide intervene with Change configration configratiion Change slide slide Check if the is damaged QD0094 All information showed in this document belong to Huaqin Co., Ltd. Do not disclose any information to the third party or person without prior approval.
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