:popcorn:Been working as an electronic tech for decades. So the first thing is to check the VCC and grounds. If they are good check the DC voltage on the + and - pins, they better be the same or you can stop there, bad IC. Look at the input and output with a scope to see if that part is working and your not missing a connection to the next stage. Get a spray can of coolant and spray the IC to see is it internally shorted, you can see the coolant vaporize instantly if it is hot. You might even touch it with your finger looking for a hot one, but the coolant is better. I've never seen something wrong with the peripherals to the IC except once a leaky coupling cap. Gone are the days where shorted out tube components would burn out resistors and short caps. Don't forget to check the DC voltages at the inputs and output. The bias on the inputs is easy to figure out by looking at the schematic and resistors giving the bias to the input and knowing that the input has an infinite resistance. Just knowing the bias at one input will tell what the other one has to be because of how op amps work. If all of this gets nowhere just replace the IC, they are cheap enough. I've never found an op amp that was not working out of it's intended parameters.