LG 42LV5500 - MAIN BOARD SECTION

MAIN BOARD SECTION
The Main board receives its operational B+ from the Power Supply via P502.
There are two LVDS cable feeds that are output to the T-CON (TFT Driver). These carry the duel 24 bit
LVDS Video and TruMotion Video equaling a 120Hz video signal. These signals have already been
prepared for the T-CON board. The Main board also includes the Tuner, Audio and Audio/Video
inputs and selection circuits.
Input Voltages from SMPS.
STAND-BY
• STBY 3.5V (P502 pins 9~12)
The Main board also develops several B+ sources on the board.
RUN
• 12V (P502 pins 17, 19 and 21).
• 24V (P502 pins 2~4).
LVDS
•
Panel VCC
(12V Not generated, but switched
STAND-BY VOLTAGES
• 3.3V_ST (Direct from SMPS through L503).
GENERAL
• 5V_Normal IC507 (Made from 12V In).
• 3.3V_Normal IC505 (Made from 12V In).
• 5V USB IC506 (Made from 12V In).
Panel
_
VCC
(12V
Not
generated,
but
switched
by Q507 from the 12V arriving from the SMPS).
TUNER TU2101 and VSB CIRCUIT
• 5V_TU (Made from 5V_Normal through L2101 / 4)
• 3.3V_TU (Made from 3.3V_Normal L2103).
1 26V TU IC2103
(M d f 3 3V TU)
BCM IC101 Video Processor
• 3.3V_ST (Direct from SMPS through L503).
• 2.5V_BCM52230 (IC504)
• D1.5V_DDR (IC508 )
09V CORE(
IC501)
•
1
.
26V
_
TU
IC2103
(M
a
d
e
f
rom
3
.
3V
_
TU)
.
•
0
.
9V
_
CORE
(
IC501)
HDMI SELECTOR VOLTAGES (IC701)
• 3.3V_HDMI
AUDIO IC1702
• 3.3V_AU_AVDD (Made from 3.3V_Normal).
• 3.3V_DVDD (Made from 3.3V_Normal).
•
1.8V
(Made from 3.3V Normal
).
May 2011 LCD TV 42LV5500
56
(From 3.3V_Normal through L701)
1.8V
(Made
from
3.3V
_
Normal
).
• 24V (Direct from SMPS through L504).