LG 50PQ30 Training Manual page 34

Switch Mode Power Supply Overview
Switch Mode Power Supply Overview
Y-SUS Board
Main Board
Adjustments
The Switch Mode Power Supply Board Outputs to the :
VS
Drives the Display Panel's Horizontal Electrodes
VA Primarily responsible for Display Panel Vertical Electrodes
Used to develop Bias Voltages on the Y-SUS,
M5V
X Drive, and Control Boards
STBY 5V Microprocessor Circuits
17V Audio B+ Supply
12V Tuner B+ Circuits
5V Signal Processing Circuits
There are 2 adjustments located on the Power Supply Board VA and VS. The
5V VCC is pre-adjusted and fixed. All adjustments are made with relation to
Chassis Ground. Use "Full White Raster" 100 IRE
RV502
VA
VS
RV901
34 November 2009 50PQ30 Plasma