LG FAS166F - Section 3 Electrical

3-1
SECTION 3 ELECTRICAL
CONTENTS
TRAINING MASTER .......................................................................................................................................... 3-2
1. NO SOUND FROM SPEAKERS ............................................................................................................. 3-2
2. NO SOUND IN PORT. IN FUNCTION .................................................................................................... 3-3
3. NO SOUND IN IPOD FUNCTION........................................................................................................... 3-4
4. NO SOUND IN AM/FM FUNCTION ........................................................................................................ 3-5
5. NO SOUND IN CD FUNCTION .............................................................................................................. 3-6
6. NO SOUND IN USB FUNCTION ............................................................................................................ 3-8
7. NO POWER ............................................................................................................................................ 3-9
ONE POINT REPAIR GUIDE .......................................................................................................................... 3-10
1. NO POWER PROBLEM ....................................................................................................................... 3-10
2. SPEAKER NO AUDIO OUTPUT .......................................................................................................... 3-11
3. USB NO DETECT ................................................................................................................................. 3-12
4. NO BOOTING ....................................................................................................................................... 3-13
ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................. 3-14
1. POWER (SMPS) ................................................................................................................................... 3-14
2. P-SENS ................................................................................................................................................. 3-15
3. VKK CHECK ......................................................................................................................................... 3-15
4. μ-COM PART CHECK-1 ....................................................................................................................... 3-16
5. μ-COM PART CHECK-2 ....................................................................................................................... 3-16
6. FLD DISPLAY CHECK ......................................................................................................................... 3-17
7. TOUCH PART CHECK ......................................................................................................................... 3-18
8. PWM MODULATION CHECK ............................................................................................................... 3-19
9. POWER AMP PART CHECK ............................................................................................................... 3-20
10. TUNER FUNCTION CHECK ................................................................................................................. 3-21
11. USB FUNCTION CHECK ...................................................................................................................... 3-22
12. CD FUNCTION CHECK ........................................................................................................................ 3-23
WAVEFORMS .................................................................................................................................................. 3-24
1. SERVO .................................................................................................................................................. 3-24
2. MOTOR DRIVE ..................................................................................................................................... 3-24
3. AUDIO PATH ........................................................................................................................................ 3-25
4. ADC ....................................................................................................................................................... 3-26
5. IPOD ..................................................................................................................................................... 3-26
6. USB ....................................................................................................................................................... 3-27
7. CRYSTAL .............................................................................................................................................. 3-27
WIRING DIAGRAM .......................................................................................................................................... 3-29
BLOCK DIAGRAMS ........................................................................................................................................ 3-31
1. MAIN BLOCK DIAGRAM ...................................................................................................................... 3-31
2. SMPS BLOCK DIAGRAM ..................................................................................................................... 3-33
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-35
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-35
2. MAIN-MICOM CIRCUIT DIAGRAM ...................................................................................................... 3-37
3. MAIN-ADC/IPOD CIRCUIT DIAGRAM ................................................................................................. 3-39
4. MAIN-MPEG(DSP) CIRCUIT DIAGRAM .............................................................................................. 3-41
5. MAIN-RF SERVO CIRCUIT DIAGRAM ................................................................................................ 3-43
6. MAIN-POWER CIRCUIT DIAGRAM ..................................................................................................... 3-45
7. AMP CIRCUIT DIAGRAM ..................................................................................................................... 3-47
8. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-49
9. FRONT JACK CIRCUIT DIAGRAM ...................................................................................................... 3-51
10. IPOD DOCKING CIRCUIT DIAGRAM .................................................................................................. 3-53
CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-55
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-57
1. MAIN P.C.BOARD ................................................................................................................................ 3-57
2. SMPS P.C.BOARD ............................................................................................................................... 3-59
3. AMP P.C.BOARD .................................................................................................................................. 3-61
4. FRONT P.C.BOARD ............................................................................................................................. 3-63
5. FRONT JACK P.C.BOARD ................................................................................................................... 3-65
6. IPOD DOCKING P.C.BOARD ............................................................................................................... 3-65