LG RH188H Service Manual page 13

HDR PART
ELECTRICAL TROUBLESHOOTING GUIDE ......................................................................................................................3-2
1. POWER SUPPLY ON SMPS BOARD...........................................................................................................................3-2
2. POWER SUPPLY ON I/O BOARD ................................................................................................................................3-4
3. SYSTEM CIRCUIT PART ..............................................................................................................................................3-7
4. DISC NOT RECOGNIZED.............................................................................................................................................3-7
5. WHEN PLAYING DISC, NO AUDIO OUTPUT ..............................................................................................................3-8
6. NO OPTICAL / DIGITAL OUTPUT.................................................................................................................................3-9
7. NO TUNER AUDIO OUTPUT ......................................................................................................................................3-10
8. NO EXTERNAL INPUT AUDIO....................................................................................................................................3-11
9. NO RGB / COMPONENT VIDEO SIGNAL WHEN PLAY DISC ..................................................................................3-12
10. NO COMPOSITE / S-VIDEO SIGNAL WHEN PLAY DISC .......................................................................................3-12
11. NO TV, EXTERNAL INPUT VIDEO SIGNAL ............................................................................................................3-13
12. NO DV(IEEE 1394) INPUT (VIDEO/AUDIO) SIGNAL...............................................................................................3-14
BLOCK DIAGRAMS............................................................................................................................................................3-16
1. OVERALL BLOCK DIAGRAM .....................................................................................................................................3-15
2. LAYOUT CONNECTION BLOCK DIAGRAM_1 ..........................................................................................................3-17
3. LAYOUT CONNECTION BLOCK DIAGRAM_2 ..........................................................................................................3-19
4. SMPS BLOCK DIAGRAM............................................................................................................................................3-21
5. POWER : MAIN BOARD BLOCK DIAGRAM ..............................................................................................................3-23
6. POWER : I/O BOARD BLOCK DIAGRAM ..................................................................................................................3-25
7. IN/OUT BLOCK DIAGRAM ( SCART MODEL ONLY )................................................................................................3-27
8. VIDEO BLOCK DIAGRAM...........................................................................................................................................3-29
9. VIDEO S/W PATH BLOCK DIAGRAM.........................................................................................................................3-31
10. AUDIO BLOCK DIAGRAM.........................................................................................................................................3-33
11. AUDIO S/W PATH BLOCK DIAGRAM.......................................................................................................................3-35
12. FLD / µ-COM / TUNER BLOCK DIAGRAM...............................................................................................................3-37
13. MAIN BLOCK DIAGRAM ( SCART MODEL ONLY ).................................................................................................3-39
14. TIMER BLOCK DIAGRAM.........................................................................................................................................3-41
CIRCUIT DIAGRAMS..........................................................................................................................................................3-43
1. SMPS 1 CIRCUIT DIAGRAM ......................................................................................................................................3-43
2. SMPS 2 CIRCUIT DIAGRAM ......................................................................................................................................3-45
3. MPEG CIRCUIT DIAGRAM .........................................................................................................................................3-47
4. FLASH/DDR CIRCUIT DIAGRAM ...............................................................................................................................3-49
5. RESET & 1394 & JEPG CIRCUIT DIAGRAM .............................................................................................................3-51
6. ATAPI & MEMORY CARD CIRCUIT DIAGRAM ..........................................................................................................3-53
7. I/O, µ-COM CIRCUIT DIAGRAM .................................................................................................................................3-55
8. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM ...................................................................................................3-57
9. DECODER CIRCUIT DIAGRAM..................................................................................................................................3-59
10. TIMER CIRCUIT DIAGRAM ......................................................................................................................................3-61
• WAVEFORMS ...................................................................................................................................................................3-63
• CIRCUIT VOLTAGE CHART ............................................................................................................................................3-65
PRINTED CIRCUIT DIAGRAMS .........................................................................................................................................3-71
1. MAIN P.C.BOARD........................................................................................................................................................3-71
2. I/O P.C.BOARD............................................................................................................................................................3-73
3. POWER P.C.BOARD ...................................................................................................................................................3-77
4. TIMER1 P.C.BOARD ...................................................................................................................................................3-79
5. TIMER2 P.C.BOARD ...................................................................................................................................................3-81
6. HDMI P.C.BOARD .......................................................................................................................................................3-83
SECTION 3
ELECTRICAL
CONTENTS
3-1