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Hi,
I manage to buy two broken LC2 with assumption that issue with them was related to some caps, triac, connection or some other components that are interchangeable and fixable.
Unfortunately in both LC2s main microprocessor (IC4, ST6220) is broken. Even if I manage to find such IC I won’t be able to get source code and programmer for it. Which means there is no way for me to fix those LC2. I’m assuming here that EEPROM (IC3) is there to only store some operational information not firmware code.
So my question to you guys. Maybe someone by any chance would be willing to get rid of broken LC2 electronic but with working microprocessor (IC4) in it? If so, please sent me a note.
Thanks,
Henryk
Hello Henryk,
I do have 3 ea B&O LC2 type 2130 dimmers, one is all OK the other 2 have a problem which I try to fix prior to trashing them.......
one of the units has the 5 VDC missing to drive the IR receiver, I assume it will be an easy fix as soon as I know how and where the 5VDC is generated.
I am in a desparate need to get the (Reversed Engineered) schematic diagram of the main assy.
Can you help?
TY Brasto
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 (https://www.beoworld.org/what.asp - 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.
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
your info will definitely help me to diagnose my LC2's. Most people tell me there are much better dimmers on the market today, but I just like the stylish design and resurection of broken devices. It will be a challenge with your help to disect the device and find the culprit.....