Congratulations!!
Seems that Sony has changed the contacts; I have a working TV-700U, and the AC connector is separate and square (is older of course).
Is possible to measure with a DMM to be sure in most cases, if is not possible to find some info about
: the AC part will measure a fixed DC resistance (since is a primary of a power trafo); and the DC part will measure different, due to having capacitors and diodes/transistors in the path, measuring rising values until stabilize, and different values (on a diode scale) for a polarity than another. Trouble is, if is similar to TV-700U (it have the CRT heater direct connected to DC), the measurement is more confuse.
BWT, be prepared to replace all electros in making restoration.
My TV-700U have a great image, with plenty of bright, contrast and good sharpness (after full restoration).