[Axel73]

Hello,

In fact the two amplifiers are almost the same. The only difference is that the Beolab 5000 amplifier has got one extra resistor on the number 2 board. It’s resistor R231 (13,3 kohm).

I seem to remember that this resistor is by default installed in both versions but that B&O simply cuts one of the legs of the R231 in the Beolab 3000 version…

So if you want to use the Beolab 3000 amplifier with a Beovox 5000 you simply have to resolder that leg 🙂

Best regards,

Axel

 

[Axel73]

Hello matador,
In my opinion, the first thing to check is the value of the CS battery NTC thermistor. Simply measure the resistance between the white wire and the black wire of the battery.

I think the Beo6 microcontroller was programmed to work with a “50kOhm NTC Thermistor”. By measuring thermistor resistance, the microcontroller can deduce the temperature using the 50kOhm NTC Thermistor correlation table:
at 20°C the resistance is roughly 62kOhm, at 25°C the resistance of the NTC is 50kOhm, at 63°C it will be more or less 10kOhm and so on (as the temperature increases, the resistance of the NTC decreases).

If you measure the resistance  of the CS battery NTC and  it’s something like 10kOhm at room temperature (20°C), then the microcontroller will think that the current temperature is 63°C rather than 20°C since in its correlation table 10kOhm = 63°C.
As a result the battery charging process will often be stopped because the microcontroller will think that the battery temperature is too high.

My advice would be that if the resistance value of the CS battery NTC is not close to 62kOhm at room temperature (20°C) as expected by B&O, it is better to replace it with the NTC of the old B&O battery or to buy a new “50kOhm NTC thermistor”.
If an incorrect NTC is fitted in the CS battery, it can explain why the battery is not charging correctly or enough.
Best regards,
Axel

[Axel73]

Hello,

I also think that the problem lies with the Thermistor (temp sensor):
I’ve had the exact same problem recently with a battery bought on the Internet: impossible to charge the battery with the Beo6 even if the status on the screen is “Charging”.
It seems that the Beo6 detects correctly the battery, tries to charge it but then stops immediately.
On the original B&O battery there is NTC Thermistor (between the black and white cables): its value is 50kOhm (at 25°C).
The battery bought on the internet also got a NTC Thermistor but its value (in my case) is 10kOhm at 25°C.
Since a NTC Thermistor resistance decreases when the temperature rises, it means that the Beo6 “thinks” that the new battery is very hot because its thermistor value is down to 10kOhm. That’s why it stops the charging process I guess (oddly enough  “Charging” is still displayed on the screen !?).
To solve the problem I’ve simply replaced the new battery thermistor (10kOhm) with the thermistor coming from the old B&O battery (50kOhm).
Now the new battery is charging correctly at last 🙂

I hope that this trick will help some of you solve their battery problem.

Cheers,
Axel

[Axel73]

Hello Col,

Are you still looking for a Icepower SC200 power supply board for your Beolab 11?
I had the exact same problem with my Beolab 11 (burnt PCB 35) and I’ve finally found a seller.
It’s on Aliexpress but what was delivered to me seems 100% genuine. I guess it’s a NOS.
It has been working perfectly for several days now 🙂

I don’t know if I’m allowed to post a link to the item but here it is:
https://vi.aliexpress.com/item/1005006206405867.html

Best regards,

Axel

PS: I’m not related at all to the Aliexpress seller

[Axel73]

Great idea!

I’m interested too.

Best regards,

Axel

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