If that IC hast positive and negative supply (so that it's in operation/functioning), the input impedance to the pin should be very nearly infinite so the only load should be whatever it was when you lifted pin 5. What is the voltage on the other end of the resistor (going to pin 5) you have the jumper soldered to?
So I discovered a 1k resistor right near pin 1 of U513 that measured in megohms, but after I reflowed the solder it measured OK so I left it in. After that I thought I should try and look at the gate drive on the outputs to see if anything had changed, and low and behold the offset pot was now controlling duty cycle. So what’s the next step, remove the jumpers and see what it does?
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