I might try get some good photos any idea on how many pins this chip has.
The schematic you have shows 8 pin, why do ask? Are you sure you are looking at the right IC the schematic actually matches your board?
So far you did not provide good clear straight shot pictures of the whole top and bottom side of YOUR power supply board.
BTW, I look at the picture of the power supply board provided by OP in post #, that power supply board uses two PFC Voltage booster circuits (you can see that it has two PFC Inductors), the schematic only shows one PFC circuit.
Based on P/N you provided earlier, your board also has two PFC circuit, so the schematic does not match the board. http://www.shopjimmy.com/lg-eay40505...upply-unit.htm
LG EAY40505203 (EAX40157601/17) Power Supply Unit
PWMCNTL how would I go about checking voltage on this line?
Would do the same as I did for the VCC line.
Main Filter Cap Negative to Negative lead and Positive lead to PWMCNTL pin?
It would be interesting to see if this gets enabled and shuts down the chip.
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