My LG LMXS28596S/01 refrigerator water and ice tastes bad

Brand: LG
Model Number: LMXS28596S/01
Main Symptom: Foul Smelling Water
What happens & when:

My water/ice from my fridge started tasting bad, so I changed my filter. After that it had a strong sulfur taste. I thought it might have been made worse by the filter for some reason. Might have been a coincidence, but it was really awful.

The water from our kitchen faucet tastes just fine, so this is a problem somewhere between the line coming from the sink plumbing to the water dispenser/ice maker.

I never replaced the filter, just don’t have one. Which is fine if I don’t have something funky going on in the lines. We have well water that tastes great. I just like the convenience of water and ice fill up at the fridge.

I replaced the line at the back of the fridge that goes into the filter area. That helped for a while and it was great. Then, here and there the water started tasting slightly off- kind of like sulfur or freezer burn. Unpleasant.

I was thinking maybe the line from the filter area to the ice maker needs help? I don’t know.

i haven’t used the water/ice dispenser for a few days, and I just went and got some water from the dispenser and it tasted really strongly of sulfur.

Help! I just want to be able to use this thing!

Could it possibly be the line I mentioned? Maybe the metal flex line running from the sink to the fridge? It seems a waste not to be able to use a feature I really like!! And I’m not willing to spend $50 or so to take a chance on another filter when I don’t believe that’s the problem.

Error Code (if any):
Parts or tests already tried:
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You are so close with the answer, I believe the supply line from the house water connection and where it attaches to the refrigerator is causing the issue. Not all supply line are created equal and are designed to be used in a situation where water is being consumed. Like a supply line going to a toilet is not what you want going to a refrigerator, the material in the line is different Replace the supply line with a copper line. You can get them in a kit from a local hardware store like Lowes or Home Depot.

Perfect!! Thank you so much!!