There is only one Fuse on the power leg of the MagSafe connection on the logic board. There is no fuse(s) in the One-Wire sense line. The connection goes directly to U6900 for over voltage protection of the charging of the battery.
Let’s start again what are your symptoms with your system?
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Review the MagSafe connector on your charger as well as the cord if either or worn or damages this could burn out some of the components on your logic board.
There is only one Fuse on the power leg of the MagSafe connection on the logic board. There is no fuse(s) in the One-Wire sense line. The connection goes directly to U6900 for over voltage protection of the charging of the battery.
Let’s start again what are your symptoms with your system?