Big chance the chip is just fried in that case. Here are some last things you can check, but at this point you should start thinking if it is worth your time or that you better get a new miner:
- Check if heat-sync is attached properly Can broken G1 Mini 's be fixed - #2 by Cryptised
- Check if miners fault light is on (red) Ipollo G1 Mini : Socket connect failed => Connection refused - #15 by unipi94
- Try replacing firmware, Ipollo G1 Mini : Socket connect failed => Connection refused - #12 by noobvie