Hi Brasto,
I know your
feelings here :) I don’t want to trash mine either.
The 5V missing to
the receiver might not be as easy to fix as you might think (I hope I’m wrong
in this case). This is basically the same condition that mine LC2-s are in. And
at least in my case this implies that main micro-controller is dead.
Before you draw the
same conclusion, try few simple experiments. Be very careful here. If you don’t
have access to ~15AC source and you work with live connection to mains pay
attention to not electrocute yourself.
Regarding access to
schematic the beoworld provides all user and service manuals. You will have to
pay small fee (link
- silver level will be sufficient to gain access to manuals) to join the team
here but to be fair this is well worth if you are seriously looking at fixing
anything B&O.
Since in LC2
service manual there is a mistake in schematic I’ll post below corrected
version to get you going. For PCB details it is probably fair to join beoworld
team.
Login to view image
You can start your
tests of 5V by:
-
first removing
L1 and checking if 5V is present. If yes then most likely IC4 is broken. Then
you can probably dump this PCB. If 5V is still not there, keep going…
-
remove R21.
Most likely this will not make a difference but just in case. If 5V is still not
there, keep going…
-
remove IR
Receiver module. If 5V is back then you have a culprit. If 5V is still not
there check IC1 and D5, D1. If one of them is broken then replace it and first
re-connect L1 and R21 to check if 5V is present.
-
If you are
lucky and 5V is there, check (separately) if IC1 on IR RECEIVER module is still
alive. Is should consume very few mA (look for datasheet) when normally alive.
If this is not the case then look for new IC1.
Hope this helps.
Good luck,
Henryk
