Samsung HPR4272X/XAC, Service Manual

Page: 106 / 128

Circuit Description
13-18 Samsung Electronics
■
Major Check Points and Waveforms
- The waveform during a Normal Operation
When the PDP set and the Logic Board are properly operating, the Operation Status LED blinks at approximately 0.8 second
interval as shown in Figure 1.
If the set is out of order, check the Operation Status LED first, and check that the output waveform is normal using an
oscilloscope.
Check if the waveform is the same as shown in Figure 2 by connecting the oscilloscope to the No. 12 TP in Figure 1. Check if
the waveform is the same as in Figure 3 by connecting the oscilloscope to the connector that is connected to the Buffer board.
If the measured waveform is different from the following waveforms, the board must be replaced.
To check the waveforms, refer to the following waveform patterns.
Figure 2. Normal V-SYNC Output Waveform Figure 3. Normal Address Data Output Waveform