LG 50PC1DR Owners Manual - Page 7

Troubleshooting - won t turn on

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Switch Mode Power Supply (SMPS) Voltages Troubleshooting • VS 196v used to drive the Horizontal Grid Voltage, Y SUS, and Z SUS. Measured from pins 8, 9, and 10 of connector P805 to chassis ground. Adjusted at VR951 • VA 60v used to drive the Vertical Grid Voltage, X Boards and in the IPM Circuits to develop Y and Z Drive waveforms. Measured from pins 1 and 2 of connector P805 to chassis ground. Adjusted at VR901 • 5v.DC Used to develop bias voltages for the circuits on the Y SUS, Z SUS, X, and Control Boards. Measured from pins 1 and 2 of connector P804 to chassis ground. • 3.3v. Standby voltage applied to the Analog, and Digital Boards to Bias the Signal and Control circuits. Measured at connector P803 at pins 1 and 2. to chassis ground. Adjusted at VR221. • 19v Applied to the Analog Board and used for the Audio Output Supply, present in standby. Measured at P802 pins 1 and 2 to chassis ground. • 12v Used for supplying low voltage regulators on the Digital and Analog Boards, present in standby. Measured at P803 pins 9 and 10 to chassis ground. • 6v Applied to the Digital Board used for the signal processing circuits present in standby. Measured at P803 pins 5 and 6 to chassis ground. • S 5v Standby 5 volts at P800 pin 3 applied to the Digital Board. • VS- ON Switched 5 volts at P800 pin 5 present after power up to switch on the VA, VS, and 5V on the Power Board from the Digital Board. • 5v-D Switched 5v used to bring the Power Supply out of Deep Sleep Mode. • 5V-M Needed to turn on the 5V-DC Supply. Plasma Display Panel Troubleshooting - 2007 7

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7
Plasma Display Panel Troubleshooting - 2007
Switch
Mode
Power
Supply
(SMPS
) Voltages
•
VS
196v used to drive the Horizontal Grid Voltage, Y SUS, and Z SUS. Measured from pins 8, 9,
and 10 of connector P805 to chassis ground. Adjusted at VR951
•
VA
60v used to drive the Vertical Grid Voltage, X Boards and in the IPM Circuits to develop Y and Z
Drive waveforms. Measured from pins 1 and 2 of connector P805 to chassis ground. Adjusted at
VR901
•
5v.DC
Used to develop bias voltages for the circuits on the Y SUS, Z SUS, X, and Control Boards.
Measured from pins 1 and 2 of connector P804 to chassis ground.
•
3.3v
. Standby voltage applied to the Analog, and Digital Boards to Bias the Signal and Control
circuits. Measured at connector P803 at pins 1 and 2. to chassis ground. Adjusted at VR221.
•
19v
Applied to the Analog Board and used for the Audio Output Supply, present in standby.
Measured at P802 pins 1 and 2 to chassis ground.
•
12v
Used for supplying low voltage regulators on the Digital and Analog Boards, present in standby.
Measured at P803 pins 9 and 10 to chassis ground.
•
6v
Applied to the Digital Board used for the signal processing circuits present in standby. Measured
at P803 pins 5 and 6 to chassis ground.
•
S 5v
Standby 5 volts at P800 pin 3 applied to the Digital Board.
•
VS- ON
Switched 5 volts at P800 pin 5 present after power up to switch on the VA, VS, and 5V on
the Power Board from the Digital Board.
•
5v-D
Switched 5v used to bring the Power Supply out of Deep Sleep Mode.
•
5V-M
Needed to turn on the 5V-DC Supply.
Troubleshooting