LG C3600, Service Manual

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Table of Contents
1. INTRODUCTION ......................................................................................... 1
1.1 Purpose................................................................................................................ 1
1.2 Regulatory Information......................................................................................... 1
2. SYSTEM SPECIFICATION .......................................................................... 3
3. LG-
C3600 TECHNICAL BRIEF.................................................................... 4
3.1 LG- C3600 Block Diagram .... . ............................................................................... 4
3.2 RF Part................................................................................................................. 5
3.3 BaseBand Transmit Section................................................................................. 6
3.4 BaseBand Receive Section.................................................................................. 6
4. LG- C3600 TROUBLE SHOOTING .............................................................. 7
4.1 RF Components ................................................................................................... 7
4.2 RX Trouble ........................................................................................................... 8
4.2.1 Check ANT Feedback Points ..................................................................... 8
4.2.2 Check Regulator Circuit ............................................................................. 8
4.2.3 Check VCTCXO Circuit.............................................................................. 9
4.2.4 Check Antenna Switch & Mobile Switch....................... .............................10
4.2.5 Check SAW Filter......................................................... .............................11
4.2.6 Checking Receive IQ ................................................... .............................12
4.3 TX Trouble ............................................................................. .............................13
4.3.1 Check LDO Circuit ....................................................... .............................13
4.3.2 Check VCTCXO Circuit................................................ .............................13
4.3.3 Check Transmit IQ ....................................................... .............................13
4.3.4 Check PAM Control Signal........................................... .............................14
4.3.5 Check Antenna Switch and Mobile Switch ................... .............................15
4.4 Power On Trouble .................................................................. .............................15
4.5 Charging Trouble ................................................................... .............................17
4.6 LCD Trouble....................................................................................................... 19
4.6.1 LCD Blue Screen ..................................................................................... 19
4.6.2 LCD Blank Screen or Abnormal Screen................................................... 19
4.7 Camera Trouble ..................................................................... .............................20
4.8 Color LED Trouble ................................................................. .............................21
4.9 KEYPAD Blacklight LEDS Trouble ......................................... .............................22
4.10 SIM Trouble.......................................................................... .............................23
4.11 Ear Jack Trouble .................................................................. .............................24
4.12 Speaker/Receiver Trouble.................................................... .............................26
5. DOWNLOAD AND CALIBRATION ................................. ............................28
6. CIRCUIT DIAGRAM & PCB LAYOUT…………………………………………29
7. EXPLODED VIEW & REPLACEMENT PART LIST………………………….36