Spot the difference

These are daughterboards from
Poppy's laptop. The one in the left is slightly charred! She came rushing downstairs a few days ago, laptop whirring loudly, dreadful burning smell and a little smoke.

I took the battery out and let it cool down before investigating. It looked like there was only one bit of damage and luckily I found a spare on eBay for £15.

I swapped them over and amazingly it all works!