LG 50PK950 Training Manual page 143

Main Board Plug P400 to Power Supply Voltages and Diode Check
Main Board Plug P400 to Power Supply Voltages and Diode Check
Diode Mode Check with the Board Disconnected. DVM in the Diode mode.
P400 Connector "Main" to "SMPS Board" P813
Pin
1-2
3-4
5-7
8
9-12
13-14
15
16
17
18
a
Note: The 17V, 5V, AC_Det and Error Det turn on when the RL_On command arrives.
b
Note: The M5V, Va and Vs turn on when the M_ON (Monitor On) command arrives.
c
Note: The Error Det line is not used in this model.
d
Note: If the AC Det line is Missing, the TV will not turn on.
(Relays will click, then no functions. LOGO stays on).
e
Note: Pin 18 is grounded on the Main board. If this line is floated, the SMPS turns on
Automatically when AC is applied.
Label STBY
a
17V 0V
Gnd Gnd
a
5V 0V
a c
Error Det 3.47V
Gnd Gnd
Stby 5V 3.49V
RL On 0V
a d
AC Det 0V
b
M_ON 0V
e
Auto Gnd Gnd
Run Diode Mode
16.9V Open
Gnd Gnd
5.19V 1.22V
4.11V 1.84V
Gnd Gnd
5.15V 1.17V
3.26V 1.85V
4.07V 1.78V
3.26V 1.84V
Gnd Gnd
143 October 2010
Pin front
P400
Front pins are odd
Back pins are even
50PK950 Plasma