LG 42PQ30 Training Manual page 81

Checking the Crystal X101 " Clock " on the Control Board
Checking the Crystal X101 " Clock " on the Control Board
DC Voltage Check
1.5V ~ 1.8V
X101
Osc. Check: 25Mhz
Check the output of the Oscillator (Crystal).
The frequency of the sine wave is 25 MHZ.
Missing this clock signal will halt operation of
the panel drive signals.
CONTROL
Board CRYSTAL
LOCATION
81 Preliminary Information 42PQ30