Main Board Section - LG 42LH90 Manual

MAIN BOARD SECTION

MAIN BOARD SECTION
The Main board receives its operational B+ from the Power Supply via P400.
There are two LVDS cable feeds that go to the T-CON (TFT Driver) section. These carry the duel 12
bit LVDS Video signals and the TruMotion 60Hz duel 12 bit LVDS. 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 5V pins 7~10
The Main board also develops several B+ sources on the board.
STAND-BY VOLTAGES
• 3.3V_ST
LVDS
• LVDS 12V (Not generated, but switched
from the 12V arriving from the SMPS.
TUNER and VSB CIRCUIT
• 9V which is used to make 5V TU
• 5V TU
• 3.3V
• 1.2V
RUN
• 12V pins 13 and 14
• 24V pins 17 and 18.
GENERAL
• 5V_General
• 5V_EXT
AUDIO
• 3.3V
• 1.8V
Mstar IC100 Video and Micro Processors
• 1.2V
IC3502 Tru-Motion and Dimming IC.
• 1.26V_MEMC, 1.8V_MEMC,
1.8V_DDR, and 3.3V
68 February 2010 LCD DV 42LH90