LG PLASMA 42PJ350 _ POWER SUPPLY _ STATIC TEST

POWER SUPPLY VOLTAGE CHECK

WARNING: Remove AC when adding or removing any plug or resistor.

TEST CONDITIONS

• Connector going to the Y-SUS P811 is disconnected. P301 on the Main board disconnected (coming in on P813). Use the holes on the connector P301 (Main Board side) to insert the resistors or jumper leads. Connect (2) 100 Watt light bulbs in series between VS and Ground.
• When the supply is operational in its normal state the Auto Ground line at Pin 18 of P813 is held at ground by the Main Board. This Power Supply can be powered on sequentially to test the Controller Chip IC701 operational capabilities and for troubleshooting purposes. By disconnecting P301, pin 18 is opened. To return the SMPS to the normal state for this test procedure, this pin must be grounded.

Note: Leave previous installed 100Ω resistor in place when adding the next resistor.

1. Ground the Auto Gnd Line (Pin 18) will allow the supply to be powered up one section at a time.
2. Add a 100Ω ¼ watt resistor from 5V Standby to RL_ON and the 17V and 5V Run Lines on P813 will become active. Also AC-Det and Error_Det will go high.
3. Add a 100Ω ¼ watt resistor from any 5V line to M_ON (Monitor On) to make the M5V, VS and VA lines operational. P811 (VS pins 1 and 2) (VA pins 6 and 7) and the (M5V pins 9 and 10).

SMPS connector P813 identification / voltages and diode check

P813 Connector “SMPS" to “Main" P301

PIN	LABEL	STBY	RUN	NO LOAD	DIODE
1~2	17V	0V	16.8V	16.79V	OPEN
3~4	GND	GND	GND	GND	GND
5~7	5V	0.47V	5.24V	5.25V	1.29V
8	ERROR_DET	2.88V	4.93V	4.91V	2.96V
9~12	GND	GND	GND	GND	GND
13~14	STBY 5V	3.49V	5.23V	5.25V	2.43V
15	RL_ON	0V	2.43V	0V	OPEN
16	AC DET	0V	4.5V	4.93V	2.95V
17	M_ON	0V	3.27V	0V	OPEN
18	AUTO_GND	GND	GND	4.84V	2/34V

Notes:

1. The 17V, 5V, AC_Det and Error Det turn on when the RL_On commandarrives.
2. The M5V, Va and Vs turn on when the M_On (Monitor On) command arrives.
3. The Error Det line is not used in this model.
4. If the AC Det line is Missing, the TV will shut off after 10 seconds of operation.
5. Pin 18 is grounded on the Main board. If this line is floated, the SMPS turns on Automatically when AC is applied.

Diode Mode Readings taken with all connectors Disconnected. 

DVM in Diode Mode.