LG 42PW350 - SWITCH MODE POWER SUPPLY SECTION; SMPS Troubleshooting and Operation

SWITCH MODE POWER SUPPLY SECTION
This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for
the Single Scan Plasma. Upon completion of the section the technician will have a
better understanding of the operation of the Power Supply Circuit and will be able to
locate voltage and test points needed for troubleshooting and alignments.
• DC Voltages developed on the SMPS
• Adjustments VA and VS.
Always refer to the Voltage Sticker located on the back of the panel, in the upper Left Hand
side for the correct voltage levels for the VA, VS, -VY, VSC, and Z Bias as these voltages
will var
y
from Panel to Panel even in the same size cate
g
or
y
.
ygy
Set-Up and Ve are just for Label location identification and are not adjusted in this panel.
SMPS p/n: EAY62170901
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number. (It may vary in your specific model number, always confirm part number).
On the following pages, we will examine the Operation of this Power Supply.
June 2011 42PW350 Plasma
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