Troubleshooting; Signal Control Troubleshooting - LG 60PX4DR Training Manual

TROUBLESHOOTING

This section addresses problems you may encounter. This section should be used in conjunction with
the Circuit Descriptions. There may be adjustments required after changing a board or component,
Refer to the Circuit Descriptions section.
Again, the DVR (Digital Video Recorder), DCR (Digital Cable Ready) and TV Guide features are not
discussed in this section, they each have their own section near the end of this manual.

SIGNAL CONTROL TROUBLESHOOTING

1. Confirm LED D17 is flashing, D13 is lit.
2. If not, CHECK OSC X1 output.
3. Check CTRL input voltage at P300
4. CHECK for 3.3V, 5V, 15V.
5. Check IC 11 for 3.3V, IC 3 for 2.5V
Probe point
OSC(X1)
Plasma Training
Input
voltage
DMM +
Check IC
11,13
DMM –
(GND)
53
TROUBLESHOOTING
Diode
Troubleshooting