Hi guys!
I'm new here. Found your posts and was happy.
First of all, about my history of killing BM54 Professional of my car.
My car has 16:9 Monitor, NAV MK3, CD changer, TV tuner, BM54 Professional, PDC
Cd changer, NAV MK 3, Monitor didn't work till i connect I-BUS cabl of BM54 Professional with PDC. I wanted to search why and burned my BM54 Pro. I found BM54 Beck with round pins. Tried to solder mine PCB to that workable block. After that my radio start working but without CD changer, it couldn't see it, when i click mode to cd-changer it goes again to main menu. Then i soldered from my block 29F400 chip, after that my radio start working and CD looked like working but there wasn't any sound in my speakers, i mean that i hear how my CD disc is rotates and it didn't go to main menu and showed track numbers and CD disc numbers. But there wasn't any sound from CD-changer. I decided to solder other chips and soldered next ones: DSP/DAC O-A-S-I-S, small i2c eeprom, DSP EPROM SA35FTW(This chip on 54Beck is soldered, on mine not). After that it stop working. I decided to solder back chip by chip and started from SA35FTW and my radio start working again but without CD, by clicking on modes it goes to main menu again when i choose CD-changer. What should i do? how to make my CD work again? I don't know have i DSP or not. If it's possible, please, help me to find it if i have it.

Sorry for my English...