LG DP450P - Section 3 Electrical

3-1
LCD PART .......................................................................................................................................................3-2
LCD ELECTRICAL TROUBLESHOOTING GUIDE ...........................................................................3-2
BLOCK DIAGRAM .......................................................................................................................................3-3
CIRCUIT DIAGRAM .....................................................................................................................................3-5
PRINTED CIRCUIT BOARD DIAGRAM ................................................................................................3-7
MAIN PART ...................................................................................................................................................3-11
MAIN ELECTRICAL TROUBLESHOOTING GUIDE .......................................................................3-11
1. POWER (DC-DC CONVERTER CIRCUIT) ............................................................................................3-11
2. MPEG CIRCUIT .....................................................................................................................................3-14
3. RF/SERVO CIRCUIT .............................................................................................................................3-15
4. CHARGING CIRCUIT ............................................................................................................................3-18
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ..................................3-19
1. SYSTEM 27MHz CLOCK .......................................................................................................................3-19
2. SDRAM CLOCK .....................................................................................................................................3-19
3. MT1389 VIDEO OUTPUT WAVEFORM ................................................................................................3-20
4. AUDIO OUTPUT FROM AUDIO DAC ....................................................................................................3-20
BLOCK DIAGRAMS ..................................................................................................................................3-21
1. OVERALL BLOCK DIAGRAM ................................................................................................................3-21
2. POWER BLOCK DIAGRAM ...................................................................................................................3-22
3. SERVO BLOCK DIAGRAM ....................................................................................................................3-23
4. SYSTEM BLOCK DIAGRAM ..................................................................................................................3-24
5. A/V BLOCK DIAGRAM ...........................................................................................................................3-25
CIRCUIT DIAGRAMS ................................................................................................................................3-27
1. MPEG CIRCUIT DIAGRAM ...................................................................................................................3-27
2. MEMORY CIRCUIT DIAGRAM ..............................................................................................................3-29
3. OPU & MOTOR CIRCUIT DIAGRAM ...................................................................................................3-31
4. AV CIRCUIT DIAGRAM .........................................................................................................................3-33
5. CHARGE CIRCUIT DIAGRAM ...............................................................................................................3-35
6. LCD I/F CIRCUIT DIAGRAM ..................................................................................................................3-37
7. KEY CIRCUIT DIAGRAM .......................................................................................................................3-39
• CirCuit VoltaGe CHart ................................................................................................................3-41
PRINTED CIRCUIT BOARD DIAGRAMS ...........................................................................................3-45
1. MAIN P.C.BOARD ..................................................................................................................................3-45
2. KEY P.C.BOARD ...................................................................................................................................3-49
SECTION 3
ELECTRICAL
CONTENTS