Searching for a spare part (ic for Beosound 9000

[edo69]

Hello everyone.

I am having an issue with my Beosound 9000: readinc CD, the sound disappear in 1-2 minutes, while the CD keep spinning and the timer goes on; this happens only with CD, while with other sources (radio, n. radio, n. music) everything works fine.

The technician individuated the problem in the Ic TDA1305T (DAC).

I have found the spare part on Ebay (n. 2 items), described as “original” and “brand new”.

Once arrived, the technician replaced the Ic with a new one; the result is that in 30 seconds, the sound becomes intermittent, then disappears.

Then he provided to replace the new Ic with the other new one, ant the result was: no sound at all.

At the ent, he replaced the new Ic with the original one; result: sound disappears in 1-2 minutes, exactly the same ad before.

So I am convinced that the Ic’s I have bought are not good, no obstain they have the Philips logo and the correct code.

The problem now is to find the correct spare part that was really original and brand new.

Does someone know where could I find it?

Thanks in advance to who will reply.

Location: San Marino

Favourite Product: Beosound 9000

[KolfMAKER]

I am not fully convinced yet that the TDA1305T itself is the root cause.

The fact that the CD keeps spinning and timing continues, while only the audio disappears after 1-2 minutes, could also point to a thermal issue, power supply instability, muting circuit, soldering problem or an issue around the DAC/output stage.

Also, the different behaviour with the replacement IC’s does not automatically prove they are fake.

One important question:
Which version of the Beosound 9000 is this exactly? MK1, MK2 or MK3?

There are differences between revisions/boards and that may matter here.

Do you know:
– the exact type / MK version?
– whether the service manual matches this unit?
– if the supply voltages around the DAC were measured when the sound disappears?
– if the mute signal changes state when the audio drops out?

To me this still sounds more like a surrounding circuit issue than a pure DAC failure.

Location: The Netherlands

Favourite Product: BeoSound 9000

My B&O Icons:

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