How can i repair a motherboard

Well, it depends on what needs repair.

There is no repair for bullet holes, most fires, breaking it into pieces is pretty bad too. Most repairs that actually work include plugging it in; removing and reinserting the various pieces and sometimes buying a new power supply.

What is the perceived problem? What are the symptoms? Who makes the MoBo?

well, repairing a motherboard requires a good technical knowledge...
but even though you have that good knowledge without proper equipments it's nothing... repairing motherboard by just finding such melted capacitors, burn parts..or whatever is not that reliable enough.. but it helps sometimes..

but if BGA's, IC's are the faulty one's then it's very hard to repair unless you have the devices to remove and replace those components...