LG 42PG20 Training Manual page 24

CIRCUIT DeSCRIPTIONS
could be caused by a failure on the SMPS or a circuit
using these voltages. A resistance check should narrow
4
the possible failures quickly.
POWER SUPPlY STATIC TEST
2
This test can confirm the proper operation of the SMPS
without the need to exchange the board.This Power
P
Supply can operate in a No Load State. This means that
by applying AC power to SC101 and all other plugs
disconnected, this power supply will function. Simply
G
removing P813 (Lower Right Hand Side of the board),
will cause the "AUTO" Pin 22 to go high from its normal
low state allowing the Power Supply to go to full power
2
on mode when AC Power is Supplied. Be careful after this
test and make sure the VA and VS lines have discharged before reconnecting the supply
0
cables.
If the Y-Sus and Z-Sus boards are working normal, "Display Panel Reset" will be visible
when the SMPS comes up to full power. Shorting the Auto Pattern Gen. test points at
this time should result in test patterns on the screen.
vS/vA ADJUSTMENTS
This Power Supply will come up and run with "no" load (P812 pulled). Pull P813, apply AC
power, and the Power Supply starts. Y-Sus/Z-Sus runs "Yes" both Y and Z waveforms.
Model : PDP42G1####
||||||||||||||||||||||||||||||||||||||||||||||||||||
801K542G1008000 .AKAZBED
Voltage Setting :DC 5V Va:65V/ Vs:195V
NA / -190 / 140 / NA / 100
24
PDP Training - Fall 2008
16V 16V
2 2
4 4
Gnd Gnd
6 6
NC NC
8
8
Gnd Gnd
10 10
5VSTB 5VSTB
5VSTB 5VSTB 12 12
14 14
Gnd Gnd
16 16
Gnd Gnd
18 18
AC Det AC Det
20
VS_ON VS_ON
Auto Gnd Auto Gnd
22 22
Vs TP Va TP
P812
Pin 1 or 2 Pin 5 or 6
Use Full White Raster
15V 15V
1 1
3 3
Gnd Gnd
5
5
NC NC
7 7
Gnd Gnd
9 9
5VSTB 5VSTB
11 11
5VSTB 5VSTB
13 13
Gnd Gnd
15 15
Gnd Gnd
17 17
5_V Det 5_V Det
19 19
RL_ON RL_ON
M5V_ON M5V_ON
21 21
P812