Hummmm... Measuring just the voltages on the pins is not going to be very effective at telling us what we need to know. It is far better to understand what the part is supposed to be doing, and then take surgical measurements of just the right points.
You can use the schematic on the front page of
the datasheet as a reference to your particular circuit configuration. The IC is for doing a particular thing with a particular set of parts, I don't see any way or reason why the board designer would go too far away from the recommended schematic to do this specific task. So the schematics should be very much the same, as should the resulting voltages.
You want to measure these voltages at the output stages of the power converter, as the chip is intended to make certain voltages for the rest of the circuit. Note that the chip does so outside of it's self, in external parts. These voltages are...
Vin 12-15 volts (pins 8, 4, and 5)
Vs 15~20 volts (This is probably what you are getting on pins 3 and 8 honestly)
VGL -5 volts (follow pin 11 past one cap, and one diode)
VGH 23 Volts (follow pin 10 across one cap, and one diode)
Vlogic 3.3 volts. (this will be one of the two inductors)
If you are getting all those voltages on the outputs, then there is likely nothing wrong with the power conversion on the card at this stage. It also means that whatever is powering this power conversion stage, is probably working too. But this test is not 100% definitive of fool proof. If something is dipping out after a particular voltage is reached, it could work up to that point, hit the limit, shutdown, then restart. And it could be doing this so fast that the DMM still just sees the correct voltages, even though the controllers output voltage is realistically all over the place.
Bottom line, one really needs a scope to figure out these kinds of things. Experience helps too.