LG 42LH90 - Channel Management: Editing Channels; Editing Existing Channels in List

T-CON
INVERTER
STBY 5V,
12V, 24V
PWR (Power On)
Inv On/Off
PWM-DIM
24V
P-DIM
ON/OFF
(Inverter On/Off)
VBR-B
PWM-DIM
(Global Dimming)
Pulling CN306 will place all
LEDs in full bright.
Quad 12 Bit
LVDS Video
LVDS
12V
LVDS 12V
T-CON develops
-5V, 3.3V, 16V,
26V for Panel
PWM-DIM
(Global Dimming)
12V
24V
STBY 5V
MAIN BOARD
PWR
Relay On
LVDS
12V
Quad 12 Bit
LVDS Video
To LED Backlights
24V
INV-ON
Intelligent Sensor
(Room Light Monitor)
Only affects P-DIM
Customer’s Menu
Brightness Selection
Only affects
Luminance information
ON/OFF
(Inverter On/Off)
IC3502
Dimming
Tur-Motion
Luminance Manipulated by
the Brightness Setting
Customer’s Menu
Backlight Selection
Only affects P-DIM
Luminance
I100
Mstar
Chip
Backlight setting
determines the
Backlight brightness
Ceiling
CN1
27.6V
8 LEDs
Per/block
Drive
Signal
Bright
Medium
Dim
CN4 Controls
4 Boards
Each board
controls 2 rows
of 4 Blocks.
Total 8 Blocks
Drive
Signal
DC Voltage
Manipulated by:
Video Content
Intelligent Sensor
Customer’s Menu
Backlight Setting
Freq: 120Hz
There are two
DC to DC
converters
(27.6V) for
each plug
CN3/CN4
Called M1-M4
42
42LH90 LED Backlight Controls (Block Diagram)
42LH90 LED Backlight Controls (Block Diagram)
P700
P201
CN3 Controls 4 Boards
Each board controls 2 rows
of 4 Blocks.
Total 8 Blocks
CN1
P203
CN306
Drive Signals for CN3 and
CN4 going to V1 through V64
(LED Blocks)
P3501
(Pin 1)
3.54Vp/p
(Pin 4)
3.48Vp/p
(Pin 6)
3.46Vp/p
SMPS
CN3
CN4
CN2
CN5 CN4
To Panel
CN4/CN5 carry
-5V, 3.3V, 16V, 26V and
Video for Panel
12 Bit
LVDS
Video
IC801
XD Engine
12V
Panel CTL
Local
Dimming
Control
Signals
12V
Switch
Q706
M1-M3
M2-M4
Error
Error
Error
120Hz Backlight
Blanking Signal