DELL STUDIO 1555 MOTHERBOARD

Hi there,

My Dell studio 1555 is out of warranty. I have a problem with my VGA IC in the motherboard hence laptop boots up but no diplay in LCD as well as through the VGA port (external monitor) . Tried reflowing the IC with a local technician and it worked for a week and it's now gone again (no display). Is there any permanent fix? Or where can I buy a new Motherboard. If not, please suggest me a compatible M/B that I can buy for my Studio 1555. Also please let me know if the new M/B will support my LCD display as it's a  1080p Full HD display.

Laptop Spec:
1) Processor: T6500
2) Graphics: ATI Raedon 4570 series (512 MB)
3) RAM: DDR2 4GB