Table Of Contents - LG FM300 Service Manual

1. INTRODUCTION ..................................................................... 3
1.1 Purpose ........................................................................................................3
1. Regulatory Information .........................................................................3
1.3 Abbreviations.............................................................................................5
2. PERFORMANCE ...................................................................... 8
.1 H/W Features ..............................................................................................8
. LTE Technical Specification (TS 36.101 v10.0.0)............................9
3. TECHNICAL BRIEF ................................................................ 12
3.1 MAIN ........................................................................................................... 1
3. LTE(SUB) .................................................................................................... 19
4. TROUBLE SHOOTING .......................................................... 24
4.1 Power on Trouble - 3.3V Main power ........................................... 4
4. Power on Trouble - BCM Booting Trouble .................................. 7
4.3 Power on Trouble - 3.75V LTE power ............................................ 31
4.4 SIM card Trouble .................................................................................... 35
4.5 Power LED Indication Trouble .......................................................... 41
4.6 Ethernet LED Indication Trouble ..................................................... 43
4.7 RGB LED Indication Trouble .............................................................. 45
4.8 USB Connection Trouble .................................................................... 47
4.9 Ethernet Connection Trouble ........................................................... 5
4.10 LTE RF Component (Primary) ......................................................... 55
4.11 LTE VCXO Trouble ................................................................................ 56
4.1 LTE Tx Trouble ....................................................................................... 58
4.13 Power on Trouble - LTE Booting Trouble .................................. 60
4.14 Memory Trouble shooting .............................................................. 64
5. DOWNLOAD ......................................................................... 67
6. BLOCK DIAGRAM ................................................................. 73
7. CIRCUIT DIAGRAM .............................................................. 74
8. BGA PIN MAP ...................................................................... 85
9. PCB LAYOUT ......................................................................... 86
LGE Internal Use Only

Table Of Contents

10. CALIBRATION ..................................................................... 90
10.1 LTE AUTO CALIBRATION ................................................................... 90
11. STAND ALONE TEST .......................................................... 97
11.1 Introduction .......................................................................................... 97
12. EXPLODED VIEW & REPLACEMENT PART LIST ............... 99
1.1 EXPLODED VIEW .................................................................................. 99
1. Replacement Parts ...........................................................................101
1.3 Accessory .............................................................................................18
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