texet X-Navi Service Manual Download Page 6

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1.2

、

Cannot power-on

Cannot power-on

Check if it can be power on after re-downloading (Follow 1.1)

Check the Battery connector and the on/off switch

Check the power supply and the output of U301

Change or Re-welding U301

Check the X600 output of U600 Change U600 or Re-welding it

Check the 32.768 crystal output of crystal

Change or Re-welding U101

Check the welding U101or U402 Change or Re-welding them

1.3

、

No Ring

Setting rightly and Check SPK

Check the speaker and it contacts with on the Main PCBA.

Change or re-welding the SPK

Check U1402 and the components around it Change or re-welding them

Check the AU_HPL and AUDIOEN signal (High) from U301

Change or re-welding U301

End

Summary of Contents for X-Navi

Page 1: ...TEXET X Navi Smartphone Service Manual This document is only for reference CONTENTS Specifications Safty Precautions Product Function Block Diagrams Chart of Troubleshooting PCB Diagrams SCH Diagrams...

Page 2: ...disassemble this product otherwise screw will be worn away Use a thicken twisted wire when you measure level A thicken twisted wire has low resistance therefore error of measurement is few Repair aft...

Page 3: ...set up ESD on product Because most of ESD are packed by box and aluminum plate to have conductive power they are prevented from static electricity You must maintain electric contact between ESD and pl...

Page 4: ...Block Diagrams...

Page 5: ...101 or Re welding it Check the welding Both U101 and U402 Change or Re welding them Cannot download Have DA Process But have no RB or FR or DL process Check the connection between Download Cable and h...

Page 6: ...t of U600 Change U600 or Re welding it Check the 32 768 crystal output of crystal Change or Re welding U101 Check the welding U101or U402 Change or Re welding them 1 3 No Ring Setting rightly and Chec...

Page 7: ...key Check side key Check U101 Change or re welding it End 1 6 The abnormality of speech Abnormality of speech Receiver no sound MIC not working Earphone no working Check receiver and the Check MIC an...

Page 8: ...LCD no display have backlight white screen LCD no display have no Backlight black screen Check or change LCD and check CON804 Check or change LCD check U801 and the Components around it Check and try...

Page 9: ...change U201 OK 1 11 SIM card failure SIM failure Check VSIM1_PMU and VSIM2_PMU power supply from U301 Re welding or change U301 Check SIM1 or SIM2 and the components around it Re welding or change the...

Page 10: ...GPS problem GPS Failure check antenna contact withANT1003 and ANT1004 Check U1006 and the components around it Re welding or change it Check U1000 and the components around it Re welding or change th...

Page 11: ...U701 PAEN BANDSW and from Z600 MODE_PA Re welding or change Z600 Check U600 and the components around it Check or try to change U600 and U101 End 2 2 2G TX failure 2G TX failure check the antenna cont...

Page 12: ...ing or change U701 Check U602 U604 and the components around them Re welding or change them Check U706 U709 and the components around them Re welding or change them Check U600 and the components aroun...