Sony 8-597-661-00-btf-ca422t Mount Board Service

The Sony BM4 Mount Board Service, 8-597-661-00-btf-ca422t, is an original equipment replacement tuner module designed to service specific Sony television chassis. Sony service literature identifies this part as TUNER, FSS BTF-CA422T with the part number 8-597-661-00, and describes it as BM BOARD, MOUNTED (SERVICE), indicating it is the tuner assembly that mounts to the BM4 mounting board. As an authentic service part, it is intended for use by trained technicians to restore RF input and channel tuning on affected sets, with model-specific compatibility required. Listings from retailers describe this item as an OEM service part; verify the exact chassis compatibility and installation requirements against Sony's service documentation before purchase.