Table Of Contents - LG 42LH90 Manual

Table Of Contents

Overview Of Topics To Be Discussed3
Preliminary Matters (The Fine Print)4
Important Safety Notice4
Esd Notice5
Regulatory Information5
Lg Contact Information6
Lcd Direct View Overview7
Basic Troubleshooting Steps8
42Lh90 Product Information Section9
Basic Specifications10
Basic Specifications (Logo Familiarization)11
Remote Control Familiarization12
Accessing The Service Menu13
Main Board14
Software Download15
Disassembly Section17
Removing The Back Cover18
Circuit Board Layout19
Power Supply19
Power Supply Board Removal21
T - Con Board Removal22
Removing The Main Board25
Removing The Inverter Board26
Removing Front Boards (Ir Board And Moving Led Board)28
Key Board28
Removing Front Key Board29
Troubleshooting Section30
Power Supply Section31
Power Supply (Smps) Board Layout33
Power Supply (Smps)34
Remove Ac Power37
Power Supply Connector P201 Voltage And Diode Check38
Power Supply Connector P203 Voltage And Diode Check39
Inverter (Led Backlights) Section41
Inverter Connector Identification43
General Led Backlight Block Information45
Led Backlight Basics (Local Dimming)47
Inverter Component Identification48
Inverter 27V (M 1 - M4 Power Supplies) Information49
Inverter Component Top Half Identification50
Inverter Led D302 Information51
Inverter Fuse F1 And F2 Check52
Inverter Crystal Y301 Information53
Inverter 27V (M 1 - M4 Power Supplies) Checks54
Inverter Ic2, Ic4 And Ic15 Checks55
T - Con (Tft Drive) Board Section60
T - Con (Tft Drive) Board (Shield Removed)61
T - Con (Tft Drive) Board Checks63
T - Con (Tft Driver) Board Cn4 And Cn5 (Voltage Check)65
Main Board Section68
Mainboard Layout69
Main Board Ld1000 Function76
Main Board Connector P600 To Speakers Voltage And Diode Check81
Front (Ir, Intelligent Sensor And Moving Led) Section82
Front Boards (Connections Identified)83
Front Moving Led Board Identified84
Power Leds84
Led Driver84
Front Board Connectors P101 And P2 Voltage And Diode Check85
Front Board Connector P100 And J1 Voltage And Diode Check86
Invisible Speaker Section89
Invisible Speaker System Overview (Tweeters)90
Invisible Speaker System Overview91
Interconnect Diagram (11 X 17 Foldout) Section92