I mean disconnect the channel that doesn't work until you get the missing replacements friend
But to disconnect the amplification power, its outputs are B +, OUT GND, B- these are the outputs from the source to the amplifier board and it is a single card mounted with eight power transistors between negative and positive and the B + line transistors are out of operation only those of line B are active
thanks for your comments the console I have it working with only one channel thank you very much friend (Ángel Morales)