Power Supply (Smps); Main Board - LG 42LH90 Manual

42LH90 Power Supply Turn On Sequence
42LH90 Power Supply Turn On Sequence
Main (Master)
Power SW
Power Supply will
L
Off
not be on if Main
On
Power Switch is off.
L
AC In
1
Stand
By 5V Reg
Stand
By 5V
2
IC702
Reg
3
2
At point TV is
in Stand-By state.
Energy Star
3.3V_ST
compliant.
Less than 1 Watt
IC103, Q106
Resets the
Microprocessor

POWER SUPPLY (SMPS)

In Stand-By
Primary side is
160V
In Run (PWR On)
Primary side is
390V
5
12V/24V
Regulators
24V
12V
PWR
5
6 6
24V Audio
Other
Circuits
IC1003
9V Reg
Other Regs
IC1002
Q706 (½)
5V_TU Reg
5V Switch

MAIN BOARD

5
Inv On/Off
8
2
Mstar
LVDS Panel Control
Microprocessor
7
IC100
3
4
(½)
8
Inverter
On
8
Inverter On
6
24V
Regulator
24V
A-DIM
Not
P-DIM
Used
Inv
Cust Menu for Backlight
On
Picture Content
8 9
Intelligent Sensor
P-DIM
IC3502
Mstar
Dimming
IC100
IC
(½)
LVDS
12V
12V
Q706
7
(½)
Power On/Off
34
Inverter On
Starts the Inverter
LED Drive Signal
24V B+ for
Inverter
INVERTER
Global Dimming
Manipulates All
Backlight LEDs
9
Local
Dimming
Signal
Local Dimming
Control Signal
LVDS
T-CON BOARD
12V 7
Video Arrives
LVDS 11
7
T-CON DC-to-DC
Converter generates
3.3V 16V 26V -5V
4
Remote
To Panel
Left
Side LEDs
8
To Panel
Right
Side LEDs
10
Power Button