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The usual problem with these amplifier units is that one or more of the output amplifier fail, resulting in no sound in one or more channels.
Problem is that this amlifier circuit is no possible to exchange - IC is made by hybrid technology and assembled on PCB.
We developed a kit that replaces power amplifier part of the unit, and disconnects the old power amp part of the circuit.
This can be used on any BM54, ASK or Logic 7 older revision unit with hybrid amplifier IC :
BMW 3, 5 and 7 series, plus X3 X5 Z4 (E46, M3, E39, E38, E83, E53, E85)
Some Rover 75 (Connoisseur SE), MG ZT
Range Rover (L322 2003 to 2005)
Some MINI.BM54KIT specifications: