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Service Manual
Internal Use Only
Service Manual
KE990/KE990c
Model : KE990/KE990c
Date: April, 2008 / Issue 1.0
Table Of Contents
1. INTRODUCTION .............................. 5 4.12 Camera trouble ..................................118
1.1 Purpose................................................... 5 4.13 Main LCD trouble ...............................121
1.2 Regulatory Information............................ 5 4.14 Bluetooth trouble................................124
4.15 Touch Screen trouble.........................126
2. PERFORMANCE...............................7
5. DOWNLOAD .................................127
2.1 Supporting Standard ................................7
2.2 Main Parts : Solution................................7 5.1 Introduction ..........................................127
2.3 HW Features............................................8 5.2 Downloading Procedure.......................127
2.4 HW SPEC. .............................................10 5.3 Troubleshooting Download Errors .......142
5.4 Caution.................................................147
3. TECHNICAL BRIEF ........................15
6. BLOCK DIAGRAM ........................148
3.1 General Description ...............................15
3.2 GSM Mode.............................................17 6.1 GSM RF Block .....................................148
3.3 LO generation and distribution circuits...20 6.2 Interface Diagram ................................150
3.4 Off-chip RF Components .......................21
7. Circuit Diagram ............................153
3.5 Digital Baseband (DBB/ESM6270) ........28
3.6 Subsystem(ESM6270) ...........................31
3.7 Power Block ...........................................38
8. BGM Pin Map................................163
3.8 External memory interface .....................43
3.9 H/W Sub System....................................45 9. PCB LAYOUT ................................169
3.10 Feature List ..........................................61
3.11 Multimedia Chip Interface ....................67 10. Calibration & RF Auto Test
3.12 Touch Screen Interface........................73
Program (Hot Kimchi)................173
3.13 Main Features ......................................74 10.1 Usage of Hot-Kimchi ..........................173
3.14 Main Component..................................75
11. EXPLODED VIEW &
4. TROUBLE SHOOTING ...................81 REPLACEMENT PART LIST ......177
4.1 RF Component.......................................81 11.1 EXPLODED VIEW .............................177
4.2 Main Component....................................82 11.2 Replacement Parts
.....................179
4.3 Checking VCTCXO Block ......................83
............................183
4.4 Checking Front-End Module Block ........85
11.3 Accessory ..........................................203
4.5 Checking GSM Block .............................88
4.6 Power on trouble....................................94
4.7 SIM detect trouble..................................99
4.8 Key sense trouble (KEYPAD) ..............100
4.9 Keypad backlight trouble......................102
4.10 Micro SD trouble ................................104
4.11 Audio trouble......................................105
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