Won't turn on, power adapter stays orange

My macbook suddenly shut off (might be because it was at 10%, but usually its fine) and won’t turn on anymore. I tried the SMC reset, charged it all night, the charger stayed orange. I went to the genius bar and they said it might be a logic board issue, they also told me when the battery is disconnected the machine still thinks it is charging the battery so there might be a power leak? Since then I’ve taken it home, unplugged the battery and tried turning it on with the charging cable connected. The charger stays orange and does not turn on. I think it might be some corrosion because I have a habit of using my laptop before/after showers, so it stays in the bathroom with me while showering, but I am very inexperienced and do not know what this would look like.