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#70040
Madskp
GOLD Member

But first I had to have a quick look at my grandson’s Lightsabre – no prizes for guessing what was wrong with it …

I have repaired that same fault on several pieces of toys 🙂 Not great production quality

I have also had a good look at the faulty BeoSound 4.  Basically it’s stuck at stand-by and will not respond to remote (other than power button which closes the door, which works fine).  On the keyboard the only button that makes anything happen is the LOAD, which causes the door to open further for CD loading.  The stand-by red light shows permanently, and responds by flashing if I change the option setting.   I have tried entering the Service Menu using both keyboard and remote – neither work.  I do have the PIN but am unable to enter the PIN menu.  I have tried controlling it by connecting to my BV10-32 with an ML cable – no joy there.
Searching the old forums came up with this post (amongst others) from Peter:  https://archivedforum.beoworld.org/forums/p/39215/325907.aspx#325907
So I think that is probably the problem – a SW problem related to the PIN system.  Nevertheless I stripped it down and checked all the connectors etc – the ribbon cables are mostly the push-in type (no locking mechanism) which I found a bit strange – some were quite difficult to re-insert.  The backup battery is fine (3.2V) but I also tried shorting it out briefly in the hope that this would kick the processor back into life – this didn’t work!   So unless anyone has any further suggestions I think I will give up!
Just for interest here’s a photo of the insides – the ‘suspect’ PCB6 is at the bottom and the backup battery is behind the two ribbon cables that emerge from it.

Tough luck. These Beosound 4’s does not seem to be as easy to work on as the BC2300/2500/BS Ouverture/BS 3×00 system

Looking in the servicemanual for the BS4 something about modules being registered to the BS4 when powered on for more than 12 hours or the Pin code being activated/deactivated which sounds like a lock in between the main PCB and the other components which could probably cause trouble if one module is malfunctioning.

I also noticed in the servicemanual that there are some pictures showing different points where certain voltages should be available. If you wan’t to dig further one option could be trying top measure if these voltages are present.

Other than that trying to switch modules with some from a donor could be an option, knowing that it could have the same issues.

Location: Denmark