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Inventec DG12BT, Maintenance Instruction

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Inventec DG12BT Maintenance Instruction Download Page 29

29

Innovating Customer Value  

Inventec Confidential

No ring

Check whether the 

SPK is void-welded 

or broken

Y

Re-weld or

change the SPK

N

Checking method

：

testing 

the resistance of the SPK 
by Multimeter, gearing to 
the resistance, the 
resistance of it is 8ohm 
normally

D/L the latest edition, 

Check whether it is OK

Y

OK

N

Check whether it 

has an output 

voltage of 1.8V at 

U404 pin5,8

Y

Check L405,L406

N

Check whether is has 

an output voltage of 

1.8V at U404 pin3,4

Y

Check R422,R421,

R431,C421,C431

N

H

¾

No ring

Summary of Contents for DG12BT

Page 1: ...DG12BT FLY DS400 _Maintenance Instruction Prepared by Tan Hong Yun Approved by Zhang Guo Pei Date 2008 07 12 ...

Page 2: ...tically Death halt No charge Quantity of electricity faulty detection No display LED NG on the LCD LED NG on the keyboard Key NG No ring No receiving voice No sending voice or the voice is small No vibration Card inefficacy Main module Card inefficacy Sub module Camera inefficacy Bluetooth inefficacy TF card inefficacy ...

Page 3: ...M area Antenna sub module FLASH sub module Socket of PIN card main module Antenna Main module Socket of PIN card TF card sub module CPU sub module Earphone CONN Crystal sub module Adapter CONN RF transceiver sub module BT area Camera CONN Ring Chip RF PA sub module ...

Page 4: ...4 Innovating Customer Value Inventec Confidential Transceiver main module Receiver FLASH main module K B CONN RF PA main module LCD Power supply chip CPU main module ...

Page 5: ... whether the battery and the key pad of J501 is oxidized or there is anything else on it Y N Wipe off the thing or clean the key pad Check whether the connection of K B M B is OK Y N Reassemble the K B Take out the LCD and SPK Check whether it is powered on Cross testing the LCD SPK Change the defective Y N A No power on No power on ...

Page 6: ... NO key check whether the output voltage of U501 is normal Y N C509 1 8V the capacitor C509 C511 2 8V the capacitor C511 C528 2 8V the capacitor C528 C527 2 8V the capacitor C527 C530 2 8V the capacitor C530 C505 1 5V the capacitor C505 Change X100 C100 C101 Check whether the output voltage of U5 pin3 is 0 58V around Y Change U5 C33 L8 Change the CPU U100 OK Change the FLASH U903 of the main modul...

Page 7: ...7 Innovating Customer Value Inventec Confidential R548 R502 R504 R505 R506 R507 R508 ...

Page 8: ...8 Innovating Customer Value Inventec Confidential ...

Page 9: ...hether RG106 RG107 47K QG101 is broken Y N Check whether there is anyone in CG120 CG127 broken N Change RG106 RG107 QG101 D L the latest edition both main sub module Check whether it is OK N Check whether the output frequency of XG100 is 32 768K Y N Change XG100 CG114 CG113 Y Change the defective Y OK B ...

Page 10: ...tial Replace with the programming FLASH UG200 of sub module check whether it is OK Change the CPU U100 of main module OK Check whether the output frequency of XG5 is 26M N Y N Change XG5 Change the CPU UG100 of sub module check whether it is OK N B ...

Page 11: ...11 Innovating Customer Value Inventec Confidential ...

Page 12: ...12 Innovating Customer Value Inventec Confidential ...

Page 13: ...N Change the battery Check whether the rubber used to fix the battery is lost or at the other location Y N Reassemble the rubber Check whether the battery and the key pad of J501 is oxidized or there is anything else on them Y N Wipe off the thing or clean the key pad D L the latest edition Check whether it is OK Y OK N C Shut off automatically ...

Page 14: ...ge J501 Check whether X100 output frequency is 32 768K exactly N Y ChangeX100 C100 C101 OK Refer to the maintenance method of No power on Check whether the connection of CN601 K B FPC is OK FPC is void welded Y N Reassemble the K B Or change the FPC Check whether there is any pin of the connector CN601 M B K B broken Y Change CN601 N C ...

Page 15: ...15 Innovating Customer Value Inventec Confidential ...

Page 16: ...ther the primary cell is broken Y N Change the battery Check whether the problem is resulted from KEY NG Y N Clean the K B reassemble or change the metal dome Check whether the problem is resulted from the LCD itself Y N Change the LCD D L the latest edition Check whether it is OK Y OK N D Dead halt ...

Page 17: ...N OK Refer to the servicing method of No power on Check whether the connection of CN601 K B FPC is OK FPC is void welded Y N Reassemble or change the FPC Check whether there is any pin of the connector CN601 M B K B broken Y Change CN601 Check whether the output frequency of X100 is 32 768 exactly Re weld or change X100 C100 C101 N D ...

Page 18: ...l is broken Y N Change the battery Replace with a good adaptor Check whether the primary adaptor is broken Y N Change the adaptor Check whether the battery connector J501 is oxidized or is broken Y N Clean or change J501 Check whether the connector CN602 is void welded or broken Re weld or change CN602 N Y E No charge ...

Page 19: ...eck whether there is anyone broken of R505 R508 100K N Y Change the defective Plug in Check whether it has an voltage of 1V between R502 and R504 N Y Change R502 24K R504 100K Check whether there is anyone broken of Q501 R510 N Change Q501 R510 0ohm Change the CPU U100 of the main module OK E ...

Page 20: ...lty detection Change U501 check whether it is OK N OK Check whether there is anyone broken of R505 R508 100K Y N Change the battery Change the CPU Replace with a good battery Check whether the primary cell is broken Y N Change the battery Quantity of electricity faulty detection ...

Page 21: ...CD driver can solve the problem Y N Change and save the driver Check whether the LCD is weakly welded or broken Y N Re weld or change the LCD D L the latest edition Check whether it is OK Y OK N Check whether R602 0ohm is broken Y N Change R602 Change the CPU Of the main module OK No display ...

Page 22: ...22 Innovating Customer Value Inventec Confidential ...

Page 23: ... backlighting check whether the voltage of Q502 pin3 is at the high level Y N Change Q502 D502 Check whether L501 L502 are broken Y N Change L501 L502 Change the CPU of the main module OK Check whether there is anyone broken of R539 R537 R540 R541 Y N Change the defective Change U501 check whether it is OK N LED NG on the LCD ...

Page 24: ...24 Innovating Customer Value Inventec Confidential ...

Page 25: ...roken Y N Re weld or change the LED Checking method Cross testing the two sides of LED by Multimeter gearing to the short circuit if the LED is on at one direction it shows good Check whether the connection of CN601 K B FPC is OK FPC is void welded Y N Reassemble the K B Or change the FPC Check whether there is any pin of the connector CN601 M B K B broken Y Change CN601 N F LED NG on the key boar...

Page 26: ...Value Inventec Confidential Y Check R620 R619 Q602 Y Change the resistor Check whether the resistor beside the LED is broken N Check whether the voltage at R620 is at the high level 1V OK N Change the CPU Of the main module F ...

Page 27: ...ad Y N cleaning the key pad With YC336 Check whether the metal dome is oxidized or broken Y N Change the metal dome N Check whether the connection of CN601 K B FPC is OK FPC is void welded Y N Reassemble the K B Or change the FPC Check whether there is any pin of the connector CN601 M B K B broken Y Change CN601 G Key NG ...

Page 28: ...lue Inventec Confidential Change the CPU Of the main module OK G N Check whether the side key is NG Y Chang the side key FPC Or the side key metal dome N Check whether there is anyone broken of D605 D618 Y Change the defective ...

Page 29: ...testing the resistance of the SPK by Multimeter gearing to the resistance the resistance of it is 8ohm normally D L the latest edition Check whether it is OK Y OK N Check whether it has an output voltage of 1 8V at U404 pin5 8 Y Check L405 L406 N Check whether is has an output voltage of 1 8V at U404 pin3 4 Y Check R422 R421 R431 C421 C431 N H No ring ...

Page 30: ...ovating Customer Value Inventec Confidential OK Check whether the voltage at U404 pin1 is at the high level Change U404 N Y Change the CPU Of the main module Check whether R423 20K is broken Change R423 N Y H ...

Page 31: ...31 Innovating Customer Value Inventec Confidential ...

Page 32: ...REC N Checking method testing the resistance of the REC by multimeter gearing to the resistance the resistance of it is 30ohm around D L the latest edition Check whether it is OK Y OK N Check whether L412 L413 are broken Y Check L412 L413 N Change U407 U406 U408 check whether it is OK N OK Change the CPU Of the main module No receiving voice ...

Page 33: ...33 Innovating Customer Value Inventec Confidential ...

Page 34: ...the resistance of the MIC by multimeter gearing to the resistance the positive resistance of it is 1K the opposite is 0 8K around in general Check whether the MIC is weakly welded or broken Y Re weld or change the MIC N D L the latest edition Check whether it is OK Y OK N Check whether there is anyone broken of R400 R432 1K R405 R406 1 5K Y N Change the defective I No sending voice or the voice is...

Page 35: ...vating Customer Value Inventec Confidential Change U400 U401 check whether it is OK N Change the CPU of the main module OK Check whether there is anyone broken of C402 C403 L401 L402 Y Change the defective N I ...

Page 36: ...36 Innovating Customer Value Inventec Confidential ...

Page 37: ...or is broken Y Change the motor N Checking method testing the resistance of the motor by multimeter gearing to the resistance the resistance of it is 22ohm in general D L the latest edition Check whether it is OK Y OK N Entering test mode Check whether it has an voltage of 1V at R526 Y Check R533 1K Q503 D500 N Change the CPU Of the main module OK No vibration ...

Page 38: ...38 Innovating Customer Value Inventec Confidential ...

Page 39: ...the SIM card is broken Y Change the SIM card N Check whether the socket J602 is void welded or broken Y Re weld or change J602 N D L the latest edition check whether it is OK Y OK N N Change the CPU Of the main module Change U501 Check whether it is OK OK Card inefficacy Main module ...

Page 40: ...oken Y Change the SIM card N Check whether the socket J601 is void welded or broken Y Re weld or change J601 N D L the latest edition check whether it is OK Y OK N Check whether there is anyone broken of D619 D622 Y Change the defective N Change the CPU Of the sub module OK Card inefficacy Sub module ...

Page 41: ...41 Innovating Customer Value Inventec Confidential ...

Page 42: ...roken Y Change CN701 N Check whether the camera is broken Y Change the Camera N Check whether U702 pin1 has an voltage of 2 8V pin3 has 1 5V 更换主模CPU N Y Check whether the voltage at U702 pin4 6 is the high level Y Change U702 Check whether R701 R703 are broken Y Change R701 R703 N Change the CPU Of the main module OK ...

Page 43: ...43 Innovating Customer Value Inventec Confidential ...

Page 44: ...44 Innovating Customer Value Inventec Confidential ...

Page 45: ...cy BT NG Check whether the BT antenna is touched well N Reassemble the antenna Y D L the latest edition check whether it is OK Y OK N Check whether J301 is void welded or broken Change J301 Y N Check whether BPF301 L302 are void welded or broken Change BPF301 L302 Y N J ...

Page 46: ...ction check whether is has an voltage of 2 8V at R525 N Y N Change X301 C309 C310 Check whether X301 has an output frequency of 26M Y Change R525 Y Check whether R525 0ohm is broken Change U501 N Change U301 check whether it is OK Change the CPU Of the main module OK J ...

Page 47: ...47 Innovating Customer Value Inventec Confidential ...

Page 48: ...48 Innovating Customer Value Inventec Confidential ...

Page 49: ...49 Innovating Customer Value Inventec Confidential ...

Page 50: ...y TF NG Check whether the socket J601 is void welded or broken Y Change J601 N D L the latest edition check whether it is OK Y OK N Check whether it has an voltage of 2 8V at R530 Change R530 N N Change the CPU Of the main module OK Change U501 check whether it is OK N ...

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