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Beolab 4000 pulsing tone…

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matador43
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matador43 posted on Tue, Jul 21 2020 3:58 PM

Hi Guys,

I came across a (one) Beolab 4000 for 10€. Sold as faulty.
It's black and in perfect cosmetic condition.

Believing chances were that a good cleaning from foam rot and maybe some tracks to jump will make her alive, I did go get her only to find it's a mark 2. I took her anyway…

The speaker don't turn green, stay red and emits a pulsing sound from the speakers when turned on (feed by music).

I've searched th forum for similar symptoms but without luck. Could someone tell me if it rings any bell?
I know common faults are Stby power unit and/or Ice power amp. Is any of those related with the pulsing sound, or did somebody see a chance to repair it?

I've opened the unit but have not seen anything suspect inside, not even dust.

Any advice welcome. 

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Dillen
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Dillen replied on Tue, Jul 21 2020 4:53 PM

Hybrid or ICEpower version?

Martin

matador43
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Oh sh***, I believed MK2 were all Icepower.

Can't say for sure but when I opened it I saw PCB behind the tweeter with the 8 little IC that I've already seen in Marexy's BL4 thread.

Serial is: 20657143
Type is 6642. 

Dillen
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Answered (Not Verified) Dillen replied on Wed, Jul 22 2020 10:30 AM
Suggested by Craig

Most likely a bad ICEpower module, then.

Martin

matador43
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Bad luck then,

Makes me think the MK1 problems that can be cured with just a good cleaning are close to lovely :-)

Thank you.

Dillen
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Dillen replied on Wed, Jul 22 2020 12:02 PM

Well.. a cleaning isn't always enough. There's usually a handful of components affected by the dissolving foam material, but most are indeed repairable.

Martin

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