Service manual

RGB Output Selection
The module has two video inputs and one RGB output (going into the set.)
The inputs can also handle 1080i-signals and 480p-signals (both in RGB format and
YPbPr format.)
(This selection circuitry is also needed to cope with the various formats of the non-
standardized HD set top box business.)
Video-input (3 cinches, reference number 1993-A-B-C):
• YPbPr with sync on Y.
• RGB with sync on green (note: cinch-inputs are normally used for YPbPr input.)
Video-input (D-sub, reference number 1990):
• YPbPr with sync on Y (note: D-sub input is normally used for RGB-inputs only.)
• RGB with sync on Green.
• RGB with separate H and V Sync (called VGA in 480p.)
RGB output:
This RGB output of the board is signaled into the set (HOP-section of SSB [B4].)
Matrix
The YPbPr-signal format is converted to RGB via the matrix function. In 480p-format,
the PAL matrix is used, otherwise the ATSC matrix is used.
The matrix choice is made with TDA8601 (SW1, 7107.)
This switch is controlled via the command IO-1 (called MATRIX SELECT in the figure.)