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This hard disk circuit board is specially designed for Samsung HE103SJ 3.5-inch SATA desktop hard drive, with strictly consistent version: BF41-00359A F3_2D REV.01 R00. It effectively solves common HDD problems such as no power, no spin, undetectable status and circuit damage. Each PCB is fully tested before shipment to ensure reliable performance. Perfect for data recovery service and daily hard drive repair. Note: Original ROM chip transfer may be required for proper use.