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Model GC318

L3 Service Manual

FM can’t receive channel maintain

1. Check earphone slot, soldering

2. Check whether in the no signal area

3. Check R712, R713 R121 R120 take off soldering

4. Change FM chipset

5. FM no function, change CPU

No sound output

AUDIO EARJACK

1. Check earphone audio Jack

2. Change the Components

If Still not Solve

3. Change CPU

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Summary of Contents for GC318

Page 1: ...rks Key Matrix For Flashing N A Chipset MTK6260A QSC1110 Android Version N A Processor Frequency 360MHz Network Mode GSM 900 1800 CDMA 800 GSM 64 0Mb CDMA 128 32Mb Internal memory NA Expandable Memory...

Page 2: ...amage the sensitive components of electronic products Therefore Service Centre must take the precautions which mentioned above 3 L3 Level trouble shooting Trouble shooting Repairing steps against give...

Page 3: ...0A VBAT Connector a Press power key High Current This defect cause of VDD VCC supply power Shorting Problem 1 First take off connected components 2 Such as LCD and CAMERA 3 Then judge is CDMA module p...

Page 4: ...ix It may be CPU problem Change a CPU Steps Not power on checking procedure Power on condition have power clock signal and Software these three conditions is the basic power on request 1 Check battery...

Page 5: ...ther has soldering caused short circuit 2 call drop usually stand by calling searching net drop it is leading by RF circuit RF PA defect or battery Protector board problem lack of power 3 consumption...

Page 6: ...No back LCD light chaos showing or abnormal color In maintain first check LCD soldering if FPC damaged or soldering not well change or re soldering If connect well need check the LCD module change go...

Page 7: ...CD connector If back light also have problem checking VIO18 VIO28 If above all no problem maybe PCB problem usually CPU Dry soldering 4 Keypad keypad no function a Refer to keypad connector circuit Ph...

Page 8: ...of Register Value 1 Check whether the whether the DOM in the correct position or not if not you should Change or re attach the DOM 2 if the DOM itself can working fine now you should check the circui...

Page 9: ...l b Keypad LED cannot lighten Please check the resistance which the LED matches soldering properly If the soldering has problem just Re soldering If soldering has no issue then change the LED Remove t...

Page 10: ...ing animation on the LCD displaying 2 There is a mistaken displaying while charging The steps of analyzing 1 Change the charger 2 To check the USB comport whether the soldering is properly or not 3 Ch...

Page 11: ...B USB connect to CPU directly the phenomenon as below PC Cannot read the USB it can charges but cannot use as a disk The analyzing steps 1 Change the USB cable 2 Check whether the USB is damages or so...

Page 12: ...Model GC318 L3 Service Manual 7 Main Camera 1 Check whether the camera soldering properly or not 2 Check the Camera module damaged or not 3 Change the Camera module 3 Check the camera power supplying...

Page 13: ...ition to check whether the Vibrator working fine or not If Vibrator cannot work then change another one if the vibrator working fine it proves that the control signal has not reached at the vibrator y...

Page 14: ...d if it can be detected it proves that the previous SIM card is damaged CPU 1 If there is no issue about the card slot itself then you have to check the around resistance and capacitance soldering pro...

Page 15: ...n power on but cannot detect the UIM card Insert UIM Card and power on the handset if it is displaying Insert UIM card and can check the CDMA saw version you can input 0000 to check the CDMA sw versio...

Page 16: ...RFA2 VREG_ MPLL VREG_ XO whether the voltage is proper or not 2 No current 1 Check the output voltage of CDMA CPU and check the soldering of resistance and capacitance if there is some problem about t...

Page 17: ...oth BT fault BT not Activating Check antenna soldering well or not C315 C314 soldering or not BT Antenna Can t find other equipment Change CPU 11 FM Radio FM circuit theory and maintain FM fault FM no...

Page 18: ...earphone slot soldering 2 Check whether in the no signal area 3 Check R712 R713 R121 R120 take off soldering 4 Change FM chipset 5 FM no function change CPU No sound output AUDIO EARJACK 1 Check earp...

Page 19: ...et mica no sound first check micbias0 whether is high voltage C401 C501 damaged or not C net C net mic no sound first check micbias0 weather is high voltage C410 C425 damaged or not 2 If above inspect...

Page 20: ...n 1 If receiver is damaged change it 2 check U402 B703 B704 is fake soldering or not C708 C709 whether short circuit with earth RV400 RV402 whether soldered reversed 3 check receiver s circuit after a...

Page 21: ...Model GC318 L3 Service Manual Physical Aoudo Jack...

Page 22: ...ll up function Analysis under not plug earphone status remind plug earphone pull out earphone not identify earphone earphone can t pick up and hang off call earphone no sound earphone noise earphone M...

Page 23: ...ibration mode reset it If setting is ok check the soldering of the speaker If connect well change a speaker and try If still not work check spk circuit and related components G C together G side CPU M...

Page 24: ...mory Card T card circuit theory and fault maintain Not reading T card 1 Change T card identify whether T card damaged 2 Check T card slot shrapnel and oxidation or stain material 3 Check T card circui...

Page 25: ...Model GC318 L3 Service Manual GC318 PCBA Thanks For any Query or suggestion Please write to tech help micromaxinfo com...

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