My hardware works perfectly
Are you telling the truth ?
Just so we are both talking about the same thing, are you using the scope programme that I gave you the link for ?
just want a confirmation if the simple circuit in reply #21 is the best for dumping in that case.
Connect the photo transistor as indicated in reply #21.
Point the TV remote at it.
If necessary, adjust the microphone volume control and/or the scope amplification control.
If you have problems, unsolder one end of the resistor in the jack plug.
If possible, post a screenshot of the scope display.