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This happens with some models. You can open the TV from the back and disconnect the connector for the side control board. You will only have control via the remote but your volume issue should be resolved.
First solution would be to try and use the remote. If the remote is able to, the problem is in the knob. If the remote does not work, the problem resides in the volume board.
The problem resides in the circuitry that the knob is controlling. Unfortunately this knob has a full range of motion, which means that it is simply controlling a computer chip within the unit. (i have an 1801 as well). What has happened is that some component on the volume board has gone bad, which is resulting in your non functioning volume knob.
Unfortunately this is usually a job for a professional.
If you have standard electronics skills (soldering / disassemble / reassemble), you can open the case and find where the volume knob leads to. There should be a smaller board, and see if you can access it. Usually they are rather hard to get to, or to get free to actually see what is going on. The best solution would be to find a parts receiver, and swap boards. This shotgun approach changes everything. Otherwise, look for any damaged components on the board. Swap out any components that are damaged, or appear damaged with comparable replacements.
static electricity can damage the chips on the boards. it all depends were the static voltage went to, if it was just to the buttons controller board or to the main av board. you could need new button board or you could need to replace the main board and the button board its hard to say with static shock.
try putting the remote an inch away from the IR receiver on the unit and see if it works then, if so then you definitely know its broken. This can and does happen. From what you have posted it sounds like no remote is working on the receiver, the ir receiver can break. If you need further assistance let me know. Thank you, Lee