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1080P
Direct View LCD
42LH50 Direct View LCD
42LH50 TABLE OF CONTENTS
TOPICS
PRELIMINARY .......................... 2 BACKLIGHT SECTION ............ 29 MAIN BOARD SECTION .......... 48
Outline ........................................... 2 EEFL Introduction ......................... 30 Removing the Main board .............. 49
Overview ....................................... 3 EEFL to CCFL ............................... 31 Main board layout .......................... 50
Safety Notice and Cautions ........... 4 Ballast Section of the SMPS .......... 32 Front side component voltages ....... 51
ESD Notice .................................... 5 Ballast Turn on signals ................... 33 Main board (Back Side) layout ...... 52
Regulatory Info............................... 5 P-DIM Effect on the drive ............. 34 Back side component voltages ....... 53
Contact Information ....................... 6 P201 Connector checks .................. 35 Crystal checks ................................ 54
Handling and Safety ...................... 7 SK100 and SK101 checks .............. 36 LD2400 functions .......................... 55
Basic Troubleshooting Steps ......... 8 Tuner with shield off ...................... 56
T-CON SECTION ........................ 37 Tuner signal checks ........................ 57
PRODUCT INFORMATION ..... 9 Removing the T-CON board .......... 38 Clock and Data lines ...................... 58
Feature List .................................... 10 Removing the LVDS cables ........... 39 P2400 connector check .................. 59
Pixel Count Explained ................... 11 Removing locking tabs .................. 40 P1100 connector check .................. 60
Product Logos ................................ 12 T-CON layout ................................ 41 P1101 connector check .................. 61
Remote Control ............................. 13 T-CON component locations ......... 42 P3400 connector check .................. 62
Accessing Service Menu ............... 14 T-CON voltage checks .................. 43 P2300 connector check .................. 63
Rear and Side Inputs ...................... 15 T-CON panel voltage generation .. 44
Software Download Screen ........... 16 CN4 and CN5 voltage checks ........ 45 FRONT IR AND LED ................ 64
Dimensions .................................... 17 CN1 voltage checks ....................... 46 Connectors identified ..................... 65
CN2 voltage checks ....................... 47 Components identified ................... 66
TROUBLESHOOTING .............. 18 P1 and P2 connector checks ........... 67
Back Cover Removal ..................... 19
Circuit Board Layout ..................... 20 SIDE KEY SECTION .................. 68
Power Supply Section .................... 21 P3000 connector checks ................. 69
Power supply board Removal ........ 22
Master Power Switch Warning ...... 23 INVISIBLE SPEAKERS ............ 70
Power Supply layout ...................... 24 Speakers identified ......................... 71
Power Supply Start Up sequence ... 25 Tweeter damage warning ............... 72
Power Supply Micro commands .... 26 Tweeter layout ............................... 73
Power Supply Testing Step 1 ......... 27
Power Supply Testing Step 2 ......... 28 11X17 FOLDOUT SECTION ..... 74
Page 1
OUTLINE
Section 1
Contact Information, Preliminary Matters, Specifications,
LCD Overview, General Troubleshooting Steps,
Signal Distribution, Disassembly Instructions and Voltages
Section 2
Circuit Board Operation, Troubleshooting of :