Chapter 2 - Service and Troubleshooting
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QM Service Page
The QM service page is accessed by pressing the “JUMP” button on the
remote commander once the service mode has been accessed. This
switches service data to the ATI Micro also located on the BU1 board.
Although various adjustments are available within this group most of them
are related to customer graphics display properties and are not usually
in need of adjustment. What is important is the availability of test pattern
graphics that can be useful in troubleshooting video issues, especially
those that involve distortion in the video signal.
Once in the QM service group, the initial page will be labeled “INFO”.
Use the “1” key to scroll to the next page labeled “TPNS”. The data value
default is “zero”. By changing the data value with the “3” button, various
test patterns in 4 different resolutions can be displayed on the screen with
the initial color bar pattern shown in Figure 2-10. There are 20 sets of
patterns for the 4 resolutions. They are as follows:
1-20 1080i
21-40 480i
41-60 480p
61-80 720p
Since these patterns are generated by the ATI Micro which is located on
the BU1 board along with the video process circuits, they do not provide
much assistance in isolating video problems as past chassis designs in
which the ATI Micro was located on a separate board. They do, however,
provide a clean, stable video source to assist in closer examination of
the screen display. This is especially useful when trying to determine if a
distortion problem is being caused by the LCD panel.
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