LG XA64 - SECTION 3 ELECTRICAL

SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE .................................................................................... 3-2
1. SMPS PART ........................................................................................................................................... 3-2
2. MUTE ...................................................................................................................................................... 3-3
3. AUDIO ABNORMAL ............................................................................................................................... 3-4
4. AUDIO FUNCTION MODE ..................................................................................................................... 3-5
5. IC301 TROUBLESHOOTING ................................................................................................................. 3-6
6. IC600 TROUBLESHOOTING ................................................................................................................. 3-7
7. IC601 TROUBLESHOOTING ................................................................................................................. 3-8
8. IC603 TROUBLESHOOTING ................................................................................................................. 3-8
9. U503 TROUBLESHOOTING .................................................................................................................. 3-9
10. TU501 FM TUNER MODULE ................................................................................................................. 3-9
11. CD PART .............................................................................................................................................. 3-10
12. CD READING CHECK .......................................................................................................................... 3-11
13. USB PART ............................................................................................................................................ 3-12
WAVEFORMS ............................................................................................................................................. 3-13
1. CD SEARCHING WAVEFORM ............................................................................................................ 3-13
2. SPINDLE DRIVE & MOTOR WAVEFORM .......................................................................................... 3-13
3. CD PLAYING WAVEFORM .................................................................................................................. 3-14
4. CD STOP ACTION WAVEFORM ......................................................................................................... 3-15
5. CD READING WAVEFORM ................................................................................................................. 3-15
6. CD PLAYING RF WAVEFORM ............................................................................................................ 3-16
7. USB OPERATING WAVEFORM .......................................................................................................... 3-17
8. RADIO OPERATING WAVEFORM ...................................................................................................... 3-17
WIRING DIAGRAM ................................................................................................................................... 3-19
BLOCK DIAGRAMS ................................................................................................................................. 3-21
CIRCUIT DIAGRAMS ............................................................................................................................... 3-23
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-23
2. MAIN CIRCUIT DIAGRAM ................................................................................................................... 3-25
3. MAIN - CD CIRCUIT DIAGRAM ........................................................................................................... 3-27
4. MCU CIRCUIT DIAGRAM .................................................................................................................... 3-29
5. FRONT, USB & HEADPHONE CIRCUIT DIAGRAM ........................................................................... 3-31
CIRCUIT VOLTAGE CHART ................................................................................................................. 3-33
PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... 3-35
1. MAIN P.C.BOARD ................................................................................................................................ 3-35
2. SMPS P.C.BOARD ............................................................................................................................... 3-37
3. MCU P.C.BOARD ................................................................................................................................. 3-37
4. KEY P.C.BOARD .................................................................................................................................. 3-39
5. FRONT P.C.BOARD ............................................................................................................................. 3-39
3-1