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Model GC318
1. Technical Specifications :
Particular
Key Matrix For Flashing
Chipset
Android Version
Processor Frequency
Network Mode
GSM
CDMA
Internal memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Remarks
N/A
MTK6260A+QSC1110
N/A
360MHz
GSM 900/1800 CDMA 800
64+0Mb
128+32Mb
NA
8GB
*#629#
L3 Service Manual
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Summary of Contents for cromax GC318
- Page 1 Model GC318 L3 Service Manual 1. Technical Specifications : Particular Remarks Key Matrix For Flashing Chipset MTK6260A+QSC1110 Android Version Processor Frequency 360MHz Network Mode GSM 900/1800 CDMA 800 64+0Mb CDMA 128+32Mb Internal memory Expandable Memory Factory mode code *#629# Good Earpiece volume...
- Page 2 Model GC318 L3 Service Manual 2. CAUTIONS I. Flashing & Servicing must be undertaken by qualified personnel only. II. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn. III. Use only approved Tools & components as specified in the parts list.
- Page 3 Model GC318 L3 Service Manual 3. analog switch and so on First method: Touch heat under High Current Through touch the heat components finding problem, after charging in short time. Second Method: Excluding method If can’t find problem， using excluding method. Take off components one by one: Proceeding：take off LCD, keypad board, torch—>...
- Page 4 Model GC318 L3 Service Manual 16) Restart / Hang Steps：Auto power off, hang investigation 1. Check battery connecting well or not, battery protector circuit damaged or not；check the battery by millimeter. 2. Voltage whether is above 3.5V, if below 3.0V, battery is over drained damaged.
- Page 5 Model GC318 L3 Service Manual Steps: Call drop, draining check procedure Call drop, drain and Leakage usually phenomenon are phone heat, short stand by. Ampere meter testing will show High current, leakage. If don’t fix this defect, it will damage cell phone and battery 1, first check whether 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...
- Page 6 Model GC318 L3 Service Manual 3) LCD abnormal showing refer to LCD connector circuit LCD Display Problem: Phenomenon： White LCD, 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 good LCD...
- Page 7 Model GC318 L3 Service Manual light also have problem, checking not working, should check the back light VBAT added on LCD connector. If back VIO18/VIO28 If above all no problem，maybe PCB problem，usually CPU Dry soldering 4) Keypad (keypad no function)
- Page 8 Model GC318 L3 Service Manual Power On key: Check the Value of Register Value 1, Check whether the whether the DOM in the correct position or not, if not you should Change or re-attaché the DOM 2, if the DOM itself can working fine, now you should check the circuit line regarding...
- Page 9 Model GC318 L3 Service Manual 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 the Keypad Dome Sheet to test...
- Page 10 Model GC318 L3 Service Manual 5）Charging The phenomenon of charging issue is as below: 1, There is no charging animation on the LCD displaying. 2, There is a mistaken displaying while charging. The steps of analyzing ： 1. Change the charger 2.
- Page 11 Model GC318 L3 Service Manual 6）USB 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 soldering properly...
- 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 Model GC318 L3 Service Manual 4. Change the CPU 8）Vibrator 1. Check the soldering between Vibrator and PCBA is properly or not, if soldering has no issue, using the digital power supply at 2 Volt position to check whether the Vibrator working fine or not .If Vibrator cannot work, then change another one;...
- Page 14 Model GC318 L3 Service Manual 1. Check whether the SIM card is damaged 2. The component of card slot is damaged or not; whether the indication of inserting SIM card is correct or not 3. Check whether the power supply to SIM card is connected or not 1.
- Page 15 Model GC318 L3 Service Manual b）CDMA UIM：CDMA part can 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 version ),it proves that the issue exist on the...
- Page 16 Model GC318 L3 Service Manual Phenomenon 2: CDMA part cannot power on, it caused the UIM card cannot be detected： Insert UIM card, and going to idle screen, if it can displaying “Insert UIM card”，but cannot check the CDMA SW code by inputting *#0000#,it proves that CDMA part cannot power on.
- Page 17 Model GC318 L3 Service Manual 10）Bluetooth 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 function, FM no channel, no sound output...
- Page 18 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...
- Page 19 Model GC318 L3 Service Manual 12）Outgoing Audio / MIC (MIC no sound maintain) Check MIC first。If MIC is ok，check R471， R472 fake soldering or not，check TVS703，TVS704 soldering reversed? C406，C408 short circuit with earth 1.confirm G net or C net no sound：...
- Page 20 Model GC318 L3 Service Manual Receiver no sound maintain 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 above , still have problem, change CPU...
- Page 21 Model GC318 L3 Service Manual Physical Aoudo Jack...
- Page 22 Model GC318 L3 Service Manual EINT_HEADSET is earphone checking pin， plug in earphone， pull down this pin， judge earphone in， other hand is earphone out。ADC_HEADSET is checking receiving call; hang off，press receiving key XMIC line pull down， then ADC_HEADSET detect low voltage. MICBIAS is positive bias voltage，pull up function. Analysis：under not plug earphone status，remind plug earphone, pull out earphone；not identify earphone, earphone can’t pick...
- Page 23 Model GC318 L3 Service Manual 14）Speaker（speaker not work（Speaker circuit）） First check setting，if setting is vibration 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 MT6260 inside PA，...
- Page 24 Model GC318 L3 Service Manual 15）Memory 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 circuit fake soldering, check power supply...
- 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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