LG 42PQ30 Training Manual page 100

Main PWB Troubleshooting
Main PWB Troubleshooting
This Section of the Presentation will cover troubleshooting the Main Board. Upon completion
of this Section the technician will have a better understanding of the operation of the circuit
and will be able to locate voltage and resistance test points needed for troubleshooting and
alignments.
Operating
Operating
• DC Voltage and Waveform Checks
• Resistance Measurements
SMPS Supplied
Voltages
Voltages
Developed
on the Main
Board
5V Stand-By
12V
16V
Preliminary Information 42PQ30
100
5V
3.3V (2)
2.5V
1.8V