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Problems with starting AV 9000

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Graham1982
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Graham1982 posted on Sat, Dec 7 2013 8:52 PM

Hi all

 

I now have a problem with the above system - I had it connected in an inconvinient place for testing (just got it) so disconnected, moved and re-setup. Now it will not come out of standby - sometimes it will deguass othertimes not and the red led on the top corner of the TV turns from red quickly to green and then back again with no attempt to turn the TV on or turn the stand.

 

The VHS system does appear to be functional and it appears to be an issue with the TV itself.

 

I am wondering if this is a safety feature - does it sense perhaps that it is not seated in the stand properly (I think it is) and alas won't turn on?

Ideas?

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Graham1982
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Hi all:

 

Whilst waiting for a response I have been pondering. When I took the TV apart I think I took the masterlink/stand connectors etc out with the power connected. I am wondering could I have blown a fuse and if so how would I gain access to them?

 

Thanks

 

Graham

Dave Farr
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Hi Graham,

people are always taking cables in and out with power on and I'm sure B&O take this into account so wouldn't worry too much.

I'd be tempted to remove the mains plug then remove all connections (masterlink, SCART, VHS and stand connections) one at a time, give them a blow out to clear any dust, check the pins are OK and then reconnect them.  When they are all in again, try connecting to the mains again.

What have you got this AV9000 masterlinked to?  I thought you didn't have the MPAV9000 CD unit. Do you have it linked to something else?

There are some solder joints that can be damaged on these sets which cause all sorts of silly problems but a competent TV engineer should be able to sort it out (there have been numerous examples of this on Beoworld in the past)  Where in the World are you?

Dave.

Graham1982
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Hi Dave:

Many thanks for your reply. I am in Northapton, England.  I guess I am clutching at straws here but essentially I have really annoyed myself because I got the TV for free because it was broken - turns out it wasn't and I rectified the SW error by pushing a cable in firmly. However, now perhaps through pulling a wire out or something it is broken so I feel I have done it after wanting one of these for so long!

It isn't masterlinked to anything. Essentially the VHS component is plugged into the back of the TV part via ML and the stand via the stand port. There is a pass through power connector to the TV from the VHS which is also connected (properly).

 

I have disconnected the Masterlink and the mains from the wall and left it for a couple of hours to see what will happen. There is no electrical smell from burnt caps etc so that is why I think it is maybe a fuse but if that was the case surely it wouldn't work at all? Also why does it attemt to fire up (deguass) and then just decide not to?

 

Thanks

 

Graham

 

PS I have calmed down now but last night I was so annoyed!

SHEFFIELD
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Most intermittent faults on these old favourites can be attributed to dry solder joints on the power/deflection module located at the bottom of the chassis. If you are unfortunate, the dries will have blown the line output transistor.

I was a B&O engineer for many years and have repaired lots of these old classics....

stefan
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Graham1982:

It isn't masterlinked to anything. Essentially the VHS component is plugged into the back of the TV part via ML and the stand via the stand port. There is a pass through power connector to the TV from the VHS which is also connected (properly).

 

I have disconnected the Masterlink and the mains from the wall and left it for a couple of hours to see what will happen. 

 

Dont connect the control center to ML socket. There are two similiar looking sockets on the back of the AV9000 - afair - connect the cable to the control center socket.

Stefan

Graham1982
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Hi Sheffield:

 

If it has blown that, is this part replaceable or is it too expensive?

Thanks

 

Graham

Leslie
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Graham1982:
Essentially the VHS component is plugged into the back of the TV part via ML

VHS can't be connected through ML, must be SCART. If you have the MPAV9000 it needs a special ML cable specially designed for that purpose (as what they told me). Two ML connections, one for the CC (Control Center) and the other for the MPAV9000

Brengen & Ophalen

Beobuddy
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Try to bypass the VHS component by plugging in the powercord directly into the tv. Let's see if the standby led comes up.

Graham1982
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Hi:

 

Tried that to no avail - in fact the VHS powers up then goes off when there is no feed from the TV.

 

I have spoken to an engineer about this and nearer the time (January) I will register as a silver member so I can get the service manual for the guy (non B&O specialist but has been fixing CRTs since Jesus was a lad).

In the mean time as advanced notification of a request:

 

If anyone has a AV9000 that they are breaking or chucking away can you please hold off till the new year and I will purchase parts off of you.

 

Many thanks


Graham

tournedos
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The TV part of the AV9000 is very similar to MX6000 and probably suffers the same problems. Most of them are dead electrolytic caps and bad solders, and they can take out some semiconductors as mentioned earlier. All can be repaired and the parts aren't expensive, but it can be quite a bit of work simply because there is so much to check / replace.

As long as the standby LED turns on (red) when it is plugged in, it is partly working and there shouldn't be any major damage. It won't repair itself though, so it's no use to keep trying until something actually fries!

The set has a complex self-protection circuit in the power supply and it will turn itself off it it senses problems. That's why it won't stay on.

Your repair guy might be interested in this workshop thread in the forum archives:

http://archivedforum.beoworld.org/forums/t/24571.aspx

Also worth checking the solders / connectors at the deflection coil.

--mika

Graham1982
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Hi:

 

Thanks for this - very useful. I will now power it down and leave it alone until he comes to repair it.

 

Graham

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