you are welcome m8, don't forget to supply at least 3.7V to MUTE and STANBY inputs

hint#1 cut ALL power supply lines to old amplifiers (from BM54)
hint#2 if you have bluetooth installed, you will need to feed the new amplifiers directly from old amplifiers inputs (after BM54 audio integrated switch) or you will loose BT audio function (i can send you pics about this subject)
hint#3 you cand find on BM54 board 2 lines originally used for mute and standby: better use these, will avoid annoying power up/down sounds...(i can send you pics about this subject)

regards