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.
IV. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and alignment
V. Ensure all cables and wires are repositioned correctly if Handset disassembled
VI. Electrostatic discharge can easily damage 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 given below given symptoms
1)
Doesn’t Power On...................................................
2) Restart / Hang.......................................................
3) LCD.......................................................................
4) Keypad....................................................................
5) Charging................................................................
6) USB.........................................................................
7) Main Camera..........................................................
8) Vibrator.................................................................
9) Network related issues/SIM related Issues.........
10) Bluetooth.............................................................
11) FM / Radio...........................................................
12) Outgoing Audio / MIC..........................................
13) Incoming Audio / Earpiece..................................
14) Speaker.................................................................
15) Memory Card.................................
Steps of Trouble Shooting with Images and Circuit Diagram
1.
Doesn’t’ Power On
VBAT High Current
1. VBAT High Current: Analyses
：
VBAT provide power IC are MT6252, QSC1110,
2. GSM: PA-AP5200, CDMA: PA-BST3405, Charging protecting IC, LCD light, keypad light, Torch, SIM Card
