Do not copy my work by appearance only!
You have to have experience with electronics and the right tools to measure continuity and resistance, and have a good soldering station with all the right soldering supplies and plenty soldering experience.
You will have to trace back each input (including s-video pins) to the ADV7280 chip and cut the correct traces with a scalpel knife to add the series resistor.
I repeat, DO NOT mod your RT2x unless you absolutely sure you want to void your warranty.
DO NOT, modify your RT2x if you do not have experience with electronics and all the right tools to do it proper job and test your work.
By fact that you asked for a photo of the other side, I can tell you have no experience in electronics or the right tools,, so please do not tinker with your retrotink.