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Beolab 4...static/crackling

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bramble
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bramble posted on Fri, Nov 8 2019 12:13 PM
Hello,

As heading states......only from this one speaker!! Have changed pwr link cables and power cable still same issue......any ideas or do I bin it and buy replacement

Rgds

Beovision 7 40 mk 5 ,beovision 6x3,   beosound 3000, beogram 3300 , 2 x lc2, 2 x beocom 1401, beocom 6000 x 2,  5 x beo4, 

, 4 x beolab 4's, form 2, h2, a2,a1 and a beolab 2 😀😀

 

 

 

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jvezina
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Good evenind,

That looks like a failing amplifier board on the speaker. 

See https://forum.beoworld.org/forums/t/37951.aspx

The solution is either to find and replace the defective MOSFET transistor (a DIY repair)  or to replace the board. B&O still has them in stock. 

Regards,

Jean

 

marexy
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If you only chage only MOSFET you did not repair it or maybe yes in 10% ..for short time.

A faulty MOSFET is just the result of some  XY error on the amplifier pcb.

Strange sound can also be caused by a malfunction on the other PCB of the speaker.

 

bramble
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bramble replied on Sun, Nov 10 2019 11:14 PM
Thanks for your advice[:\'(]

Beovision 7 40 mk 5 ,beovision 6x3,   beosound 3000, beogram 3300 , 2 x lc2, 2 x beocom 1401, beocom 6000 x 2,  5 x beo4, 

, 4 x beolab 4's, form 2, h2, a2,a1 and a beolab 2 😀😀

 

 

 

bramble
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358 Posts
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bramble replied on Mon, Nov 11 2019 11:53 AM
Morning all,

The static/ crackling is coming from the tweeter , I have disconnected it and crackling stops.....is this still a fault with the board or just a replacement tweeter required...your thoughts would be appreciated

Beovision 7 40 mk 5 ,beovision 6x3,   beosound 3000, beogram 3300 , 2 x lc2, 2 x beocom 1401, beocom 6000 x 2,  5 x beo4, 

, 4 x beolab 4's, form 2, h2, a2,a1 and a beolab 2 😀😀

 

 

 

marexy
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marexy replied on Mon, Nov 11 2019 12:20 PM

Tweeter is OK.

Problem is on power amp. PCB or crosower PCB.

Where are you from ?

 

bramble
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bramble replied on Mon, Nov 11 2019 12:31 PM

Marexy hi, I live in Edinburgh... 

Beovision 7 40 mk 5 ,beovision 6x3,   beosound 3000, beogram 3300 , 2 x lc2, 2 x beocom 1401, beocom 6000 x 2,  5 x beo4, 

, 4 x beolab 4's, form 2, h2, a2,a1 and a beolab 2 😀😀

 

 

 

marexy
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546 Posts
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marexy replied on Mon, Nov 11 2019 1:35 PM

You can repair it or buy new power amp board.

 

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