LG 42LV5500 Training Presentation page 43

42LV5500 Power Supply Start Up Sequence
AC In Primary side fuses:
Stand-By 7.6V Run 396V (Hot Gnd)
1
Relays
No AC
T510 &
Det in
Rectifier
this
model
Stand By
3.5V Reg
P201
Stand By
3.5V
3
At point TV is in
Stand-By state.
Energy Star compliant.
PWR_ON
0 .1 Watts
2
P502
9~12
3.5V_ST
MAIN
2
BOARD
5
Other Regs
Power On/Off1/2
2
Reset
Generator
3
C608
R644
POWER SUPPLY (SMPS) POWER SUPPLY (SMPS)
L601
Bridge
5
D253
Inverter On
Starts the Inverters
5
12V/24V
Regulators
12V 24V
DRV
ON
5 6 6
1 2~4
17
19
21
Q502
IC502
PWR_DET
IC1702
Audio Amp
See
Note 1:
12V
Q504
Q501
8
5 5
INV_CTL
RL_ON
Model 1_Opt1 Panel Control 7
Microprocessor IC602
Key 1 or IR
8
On Board
Inverter
8
8
9 10
Local
Dimming
P-DIM
8 9 10
Globar
Dimming
P1601
18 22 3 5 8
Q507
Panel
VCC
12V
Q506-7
7
7
10
Video
Processor
IC101
P901
4
43
P202
45V
6
To Panel Backlights
Local and
Manipulates Backlight
Global Dimming
P203
45V
6
Local and
Global Dimming
P-DIM1 (PWM-DIM)
Pulse Width Dimming
Global Dimming
Manipulated by:
Cust Menu for Backlight
SCLK
and
MOSI, CLK,
Picture Content
VS
Manipulate P-DIM
16 Blocks
Note 1:
12V TURNS ON:
VCC 3.3V, VDD 16.7V,
IC501 0.9V Core
IC503 Power Det
VGL_I -5V, VGH 28V,
IC506 5V_USB
IC507 5V_Normal
IC505 3.3V_Normal
After Mute Released
LVDS Video
P1501
9
P1502
4
Ft IR / Soft Touch Key
Remote or Power Button Key
May 2011 LCD-DV 42LV5500
BACKLIGHTS
120Hz
LEDs
Low = Bright
LCD PANEL
9
Video
Voltages for
7
the Panel
P-VDD 16V
T-CON PWB
12V LVDS
7
Tru-Motion
LVDS Video