Hard bricked I9300 - Won't boot, can't charge, no LED lights

Hello,

This morning my phone went suddenly off, didn't think much of it because it had 20% battery left and thought I had to recharge it but it didn't charge and I couldn't power it on, no LED lights when connected to the charger, no nothing, I tried restarting it in download mode but still nothing, it had a custom rom flashed, this one:

[link]

Had cyanogenmod before this but encountered some errors and got this one 1 week ago, it worked fine except random restarts.

Tried a different S3 battery from a friend and still nothing, my battery worked in his, it was 0% but charging although very slow, just 8% in half an hour.

Tried different ways to fix it following these steps from here [link]

Before actually going to a service shop and replacing my motherboard I want to know if there is a cheaper way to get it fixed, tried the steps above but with a 2gb card instead of a 16 one, want to try the USB JIG method but I don't know if it will work.

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