Looking at this old thread it might indicate that it has to do with PIN code protection

Location: Denmark

Mr Dumb getting Dumber, I had forgotten about the Pincode as the tv (BV10-40) does not have one! So entered the pin code, re prog'd the unit for masterlink operation, no response,   --   reprog'd as a stand alone, connected some BL speakers and yes it works. I will now try some different masterlink cables as a starter to try to id my problem, meantime, anyone out there with any suggestions please feel free to make 'em!

So have now tried various things, Tried various masterlink cables,between the BC2 and the 10-40, using then there appears to be no comms between the 2 pieces, also connected an Ouverture and prog'd that still no activity although the ouverture works with a 10-32 tv. So the problem appears to be either the tv masterlink socket, the BC2 socket or the link programming. I have tried 2 other Beo4's they made no difference. Is / are there any other things to try / check? Thanks!

Is it possible to connect the BC2 to the BV10-32? Then you can rule out of it is the BC2 that has an issue or not

I will try tomorrow if time allows!

Have tried the bc2 with the 10 - 32 and it works with the programming etc so , later today I will retry with the 10 - 40 I may well make up a new masterlink connection with a junction box etc to prove the tv maybe the problem. I have also tried an Amazon conversion cable, ie scart to hdmi, cost about 14€ and yes it works fine If I get success with the rest, I may well convert the lead from scart to hdmi(not as bulky)!

So have now tried the BC2 and the 10-40 with different masterlink cables and reprog'd them both going thro the  a opt 1 then 0 and then v opt 1 and then 2 still no bc2 response. Is the scart lead in use when radio is called?  --  I ask as I have replaced the scart with a scart to hdi converter, which did apparently work when I tested the bc2 with the 10-32! What next?

Sounds very much like it’s the BV10-40 that has an issue. To verify the option settings on the BV10-40 you could try the following (found in an old thread):

MENU 0 0 GO brings up the service Menu. Monitor / Monitor Info / lists the Option Setting

Regarding the scart connection this should not have effect on audio sources. A scart connection is setup to a specific source ( in this case DVD) and will therefor only send control signals for that    

Below the Monitor settings The tv is a Mk 1 Type   9570        Item   1847431       ser      22073022      option setting   2          Build   127        PW   328  03  80e         FEP   0380M          FEP BOOTLOADER   00.036 FA MODULE  00.02.02         STB TABLE   05.076           SYSTEM MOD   20.06A          BTB    N           DSMFEP   05.16A       DSMDSP   15.15A        DVB HD   0.1.9.9 TCON   20091123        230839 Any clarification needed please ask!