I'm following most of that, but am unsure of how to test the ic15 and 16 chips.

I put my multimeter on one side of the green resistor?? thing at the bottom of each chip (underlined in red) and got 4.93V on one side and 0.2 on the other of both.

Is this right or do i need to test the chip itself? and can i do that with just a multimeter?

Thanks very much for the help so far