CONDITION: Pulled from a fully functioning DGX-640. All connectors and components are clean with no corrosion, no cracked traces, and no burnt components. All ribbon headers and ICs intact. Shipped within one day of payment. ? DESCRIPTION: Original main logic board / motherboard removed from a working DGX-640. This is the central processing PCB that controls all core functions, sound generation, key scanning, and LCD communication. Features: ? Clean, fully working pull ? No corrosion or liquid damage ? All headers, ICs, capacitors, and resistors intact ? Verified functional before removal ? Board code: ?C13310PBS DGX-640? (visible on reverse side) Ideal replacement for DGX-640 units with no power, boot failure, corrupted sound engine, dead keyboard scanning, or LCD communication issues. ITEM SPECIFICS: ? Part Type: Main logic board / motherboard ? Board Code: C13310PBS DGX-640 ? Condition: Fully working pull ? Connectors: All ribbon headers intact ? Compatibility: DGX-640 ? Notes: No corrosion, cracks, or burnt components ? SHIPPING SELLER INFO: Ships fast ? 1-business-day handling. 30-day returns, USA seller. ? SEARCH KEYWORDS: yamaha dgx640 motherboard main logic board pcb digital piano part