Main Board Section - LG 42LH50 Training Manual

MAIN PWB SECTION
MAIN PWB SECTION
The Main PWB processes all video signal input types, Tuner (VSB, 8VSB and QAM), Component,
Composite, S-In, HDMI and RGB (PC).
There are two LVDS cable feeds that go to the T-CON. Each one carries duel 12 bit LVDS Video
signals that have been prepared for the T-CON board (TFT Driver Control board).
The Main board receives its operational B+ from the Power Supply via P2400.
STAND-BY
• STBY 5V pins 7~10
The Main board also develops several B+ sources on the board.
LVDS
• LVDS 12V (Actually just switched 12V
input from the power supply).
GENERAL
• 5V (Actually just switched STBY 5V
input from the power supply).
TUNER and VSB CIRCUIT
• 9V
• 5V
• 3.3V
• 1.2V
RUN
• 12V pins 13 and 14
• 24V pins 17 and 18.
AUDIO
• 3.3V
• 1.8V
BCM VIDEO PROCESSOR
• 1.2V, 1.26V, 1.8V, and 3.3V
2009 FALL LCD DV
48
42LH50