The european version of the TMS9918/9928 is able to produce component video.  It was used in the PAL version of the TI 99/4A.   This computer was principally sold in Europe, and thus likely is using this PAL variant of the chip.   Found an interesting pic of the interior of this system.  I cannot identify the video chip due to the heatsink being present on the VDP, however, the number of video leads is telling.     Some of the internal voltages are silkscreened on
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