I have the exact same issue on a client's Macbook Air (13" 2015) : the charger goes orange even when the battery is disconnected. The first time she brought it to me, the battery was fully discharged (after several weeks unplugged) and the macbook worked fine, but after one day or proper operations, the issue went back : impossible to turn it on. The Apple Store told her that the motherboard needed a replacement (a 600€ repair).
I’m wondering if a replacement of the left IO board would solve this issue
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=== Update (08/25/2020) ===
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At the end, I didn’t post the final result : it was an oxidation issue with a faulty charging IC, I found someone in my area who changed it for far cheaper than the Apple store
I have the exact same issue on a client's Macbook Air (13" 2015) : the charger goes orange even when the battery is disconnected. The first time she brought it to me, the battery was fully discharged (after several weeks unplugged) and the macbook worked fine, but after one day or proper operations, the issue went back : impossible to turn it on. The Apple Store told her that the motherboard needed a replacement (a 600€ repair).
I’m wondering if a replacement of the left IO board would solve this issue