can you try and trace out some test pads connecting to the TV input and output pins on the northbridge??
U4, U3, V3, N01, P02, P03, P04, R01, R02, R03, R04, R05, T01, T02, T03, T04, T05, U01, U02
V2, U5, V1, V5, V4, W5, W2, W1, W4, Y3, Y4
with this info, we should be able to attach external encoder/decoders, and get TV in and out on our IOs soon to (hopefully have TFTs)