Sony KDP-51WS550 Training Manual page 11

Figure 2-4 give connector/pin details for viewing Q-Box operating voltages and output signals for troubleshooting.
The signals that should be present on the various pins are illustrated in waveforms 2-5 to 2-10. The operating
DC voltages of 9V and 5V are labeled on the diagram.
Note the different scan rates for the Y-Signal in waveforms 2-7 and 2-8. These waveforms forms are displayed
when receiving a terrestrial signal (RF connector). Waveform 2-7 is an example of a DTV 480i (Interlaced signal
format),, and waveform 2-8 is an example of a HDTV 720p (progressive scan).
NOTE: The 480i and 720p are valid signals for the AX-1 chassis to process and display. The key to
display the signals correctly is that the aspect ratio that the broadcaster sends must be correct for the
format. For example, the 480i signal should be a 4:3 aspect ratio and the 720p signal should be 16:9
aspect ratio. All HD (1080i, 1080p, 720p) signals should be a 16:9 aspect ratio.
Problems occur when the broadcaster sends the HD signals in a 4:3 aspect ratio, which is common at
the time of this writing (2003). The 720p signal shown in waveform 2-8 is a HD signal with an aspect ratio
of 4:3, which when displayed is cropped inward on left and right sides of the picture (thick black bar
areas on both sides). The user cannot adjust the width (make it fill the entire screen) of the picture using
"Wide Mode" adjustment. This is due to the fact the unit is receiving a HD signal (720p), and by industry
standards (ref. Table 2-1) the signal should be broadcast in 16:9 aspect ratio. So, the unit is fooled into
thinking it is displaying the picture in 16:9 (maximum width for the unit), but in reality the display is 4:3.
Consequently, no compensation can be made.
CAUTION: Due to the possibility of screen burn, do not leave the set in the HD 4:3 aspect ratio mode for
an extended period of time.
Horizontal Lines
480
480
720
1080
Table 2-1 - Digital Television Standard Display Formats
Vertical Lines
640
704
1280
1920
Aspect Ratio
4:3
16:9 4:3
16:9
16:9
9
2. New Features
Scan Rate
60i, 60p, 30p, 24p
60i, 60p, 30p, 24p
60p, 30p, 24p
60i, 30p, 24p