1)If you soldered anything to the mainboard before it occured, whatever you are powering from this point is drawing too much power so get rid of it.Also get rid of everything that you can see that might bridge anything near the GPU.
2) X-Clamp replacement
3) Reflow GPU and HANA chip
4) If it\'s not the GPU/(H)ANA, it might in rare cases be the CPU and can be fixed by reflowing the CPU.
5) if you flash with xell on JTAG-fixed xbox360 this will appear, flash back to original.
6) also can be caused by a broken trace

Here is info on the error,

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Also I would send it to a trusted seller to get it repaired, or if you have warranty still, send to Microsoft.