LG 50PK950 Training Manual page 52

Power Supply Static Test with Light Bulb Load
Power Supply Static Test with Light Bulb Load
Using two 100 Watt light bulbs, attach one end to Vs and the other end to ground. Apply AC to SC101. If the light bulbs
turn on and VS is the correct voltage, allow the SMPS to run for several minutes to be sure it will operate under load. If
this test is successful and all other voltages are generated, you can be fairly assured the power supply is OK.
Note: To be 100% sure, you would need to read the current handling capabilities of each power supply listed on the silk
screen on the SMPS and place each supply voltage under the appropriate load.
Pins 1 or 2
VS
Gnd
Pins
4 or 5 or
Note:
To turn on the Power Supply;
1) With Main Board connected, press power.
2) Without Main Board connected SMPS will turn on automatically.
Any time AC is applied to the SMPS, STBY 5V will be 3.49V and
will be 5.13V when the set turns on.
AC DET WILL NOT be present until set comes on.
If AC Det is missing, the TV will NOT come on.
P812
Va Vs
TP TP
F801
4A/250V
8
VR901
VS Adj
T901
T902
F302
2.5A/250V
T301
F101
RL101
RL103
10A/250V
AC In
SC101
Check Pins 13 or 14
for 5V SBY (5.13V)
Check Pin 8
for Error Det (4.1V)
Check Pin 16
for AC Det (4.06V)
52
P811
P811 or P812
Check Pins 1 or 2
for Vs voltage
P811 or P812
Check Pins 6 or 7
VR501
VA Adj
for Va voltage
Note:
Always test the SMPS under a
load using the 2 light bulbs.
n/c
Abnormal operational
conditions may result if not
Pin 1
loaded.
(Front Left)
P813
P813
Check Pins 1 or 2
For 17V (17.3V)
Check Pin 5,6 and 7
for (+5.17V)
October 2010 50PK950 Plasma