BEIJING/SEOUL, April 27 (Rtrs) - The conflict in the Middle East has disrupted supplies of crucial raw materials and pushed up prices of the printed circuit boards (PCB) used in almost all electronic devices, from smartphones and computers to AI servers, industry sources and executives said. The disruption is a fresh blow to electronics manufacturers which are already grappling with soaring memory chip costs and highlights the broadening impact of the Iran war that has wreaked havoc on supply