Sony KDS-R50XBR1 Training Manual page 109

The Rook IC on the C board is capable of

displaying test patterns. These are very
important in determining if a video defect
is related to the Optical Block or prior
video processing stage (ASU/DSU etc.)
To display the C board test patterns take

the following steps:
Enter service mode

+ [Power].
Press the [JUMP] button three times until

you arrive at the PANEL service mode.
Once in Panel Service Mode press the [2]

button five times until you arrive at Device
5 TEST_PAT.
Once in TEST_PAT you must enable the

test patterns by toggling the data from 0 to
1 by pressing the [3] button one time.
*Note the screen will turn all white, however

service OSD will still be displayed.
Once test patterns are enabled you can

display flat color fields or individual test
patterns.
TVP-21
C Board Test Patterns
[Display] + [5] + [Vol. +]
Appendix
106