[edo69]

Hello, I did the test you suggested me, more times.

When I turn on the CD, i have no sound; switch to radio and it works; come back to CD and again, no sound.

What is happening now is that I turn on the CD, and there is no sound, if I let the CD go, after some minutes, the sound comes out, and goes on….

[edo69]

That’s incredible,

with the BS9000 at home, linked with Beovision7 and Beosound5 via master link, as usual, this morning the CD worked fine; I have listened to 2 whole CDs.

After lunch, I turned on again the CD, and it worked, but no sound at all.

As usual, the CD was spinning and the time counter advancing. I changed track and CD, but always no sound.

I really I don’t know what to think.

HAve a nice weekend

• This reply was modified 1 month ago by edo69.

[edo69]

Hello, in response to your question, yes, the time counter still continue to advance normally from 00:00, even in case of no sound.

[edo69]

Tanks for your opinion and suggestios.

Is not the first time I check the TM71, and it always went fine.

Just the first times, when i tiried this test, I haven’t readen that the position #1 must be without the CD; once learned this, this test never gave me any problem.

I try to remember that the last time I did test TM71 was after the replacement of TDA1305T, and went fine.

Me too I’m thinking that TM71 fault and intermittent audio are due to different reasons.

The strange thing is that sometimes the CD works perfectly, even for hours, and sometimes works with absolutely no sound.

 

 

• This reply was modified 1 month ago by edo69.

[edo69]

A maybe important thing I forgot to tell you is that in the last few days, I did 4 times the test TM71,  with CDs in all positions except #1, as suggested in service manual.

Any time the test did not get to its end, because first open and close the glass, and it’s OK; then the sledge, attempting to move from position 1 to 6, always crashes into the CD in position 2, and the BS9000 turns OFF.

[edo69]

Hello, unfortunately I sang victory too soon.

Once replaced the LF33CDT, as you already know, we tested the BS9000 for about one hour, changing often CD and song, without any problem.

I brought it home and reconnected it.

In the same day I listened to various CDs without any problem.

The next day I turned on CD, and The CD begun to spin, the counter advanced properlìy, but no sound.

I tried more times, always with the same result.

The day after, I turned on RADIO from another room (trough Beosound 2000), radio worked fine, Then I tried with CD and it worked well.

Yesterday and the day before, always no sound. Not in yhe loudspeakers, nor in the headphones.

We have to start searching again where the trouble is…

There is something more: sometimes the commands do not reach BS 9000 (that is in option 0): happens sometimes that I give the command “CD” with the Beo4 to Beovision 7 (with option 2) and the BS 9000 does not turn on.

It even happened that, giving the command “n. music” with Beo4, the display on Beovision 7 is not “n. music”, but “n. music 1” and Beosound 5 (in “master audio off”) does not turn on.

So I think that:

BS 9000 is still not working properly;

I even have a problem with masterlink connections (or BS9000 working not properly, crashes the masterlink connections)

It’s always more complicated.

• This reply was modified 1 month, 1 week ago by edo69.
• This reply was modified 1 month, 1 week ago by edo69.

[edo69]

Hello,

GOOD NEWS, AT LEAST!

We finally got to replace the LF33CDT and now the BS9000 sounds great!

Te tested it for more than 1 hour, without any problem.

The funny thing is that I have bought 4 of this component at the price of 7 Euros.

Once again, thank you for all your support.

 

[edo69]

Hello,

finally we had the possibility to test PCB32 components with the cooling spray.

the result was that the sound remains for more time cooling the LF33cdt.

So we will buy some and we will replace it in 2 weeks, ’cause the technician is going to holidays.

I will let you know…..

[edo69]

Hello, I begin to have some doubts regarding the possibility to repair the PCB32.

Right today, I have readen that the PCB 32 is a multi-layer board (4 layers); do you think that the issue could be in an internal conductive track?

In this case, we can not check nor repair internal tracks.

[edo69]

What happens is that, when I am cooling the C403 on PCB32 with compressed air, the souud comes back, but it lasts any seconds, then disappears again. What does it mean?

[edo69]

Hello

Thanks again for all your help.

The issue is increasingly complex.

As you already know, after replacing the Ic TDA1305T, the issue is still present.

These are today’s updates:

First of all, we were unable to find a can of spray cooler, so we did the test with a can of simple compressed air.

We ordered the spray cooler online, and it will arrive soon.

In the meanwhile, we noted that cooling the capacitor C403, the sound come out back; we replaced it, but nothing changed.

Then we replaced the capacitors C401 and C403, ’cause even cooling them, the sound come out back. But the problem persists.

We noted that wnhen the sound disappears, the TR405 output voltage starts to oscillate (from 3,08V to 3,22V, more or less), but we did not find what C403 got to do with TR405 .

So we are taking a pause due to the arriving cooler, that will allow us to make more accurate tests.

That’s all for the moment.

[edo69]

Hello,

today I have bad news and good news.

Bad news: after replacing the TDA1305T, the problem persists.

so you were right, being not convinced that the fault was in said Ic.

good news: the techician tried to cool down dhe PCB32 board after the BS9000 became mute, and the sound came back.

now we have to find out which one is the component that overwarming itself cause the problem.

do you have any suspect?

 

• This reply was modified 2 months, 2 weeks ago by edo69.

[edo69]

Hello,

the board with the two TDA1305T is jusr arrived.

The day after tomorrow we will replace it and I will let you know the result.

[edo69]

Hello,

unfortunately the DAC board I have found on http://www.audiophonic.fr is not the same mounted on Beosound 9000; It is only used to disassemble one of the two Ic TDA1305T and replace the original one with it.

[edo69]

Unfortunately noone of these suppliers you suggested have the TDA1305t in stock.

I also tried with 12 other sellers, such as: Mouser, Farrell, Tme, etc. and noone had avaliability.

So I decided to purchase an entire DAC board with n. 2 TDA1305T inside, on http://www.audiophonics.fr; I will keep you updated

[edo69]

Sorry, I missed to tell you about this test, that we already have done:

The result is that when the sound disappears, even the analog audio signal disappears at the output pins of the TDA1305T .

At this point, I think we have no more any doubt regarding the need to replace the TDA1305T to fix the problem.

As you already know, we already tried to replace the original DAC with other two, that I have purchased on Ebay, and, no obstain the Ic’s were guaranteed as “original” and “brand new”, noone of them, once mounted, werk properly.

Do you know any reseller of electronic components who could sell me a truly original and brand new Ic?

Thank you a lot for your precious cooperation

[edo69]

Goodevening,

today with the tachnician we check these line:

pin:
4. BCK -> Signal ok

5. WS -> Signal ok

6. Data -> Signal Ok

19. MSUB – > before and after audio stop remain on 5v

1. VDDA – > 5v, before n after

10. VDDD -> 5v, before n after

28. VDDO -> 5v before n after.

 

Technician reamin on idea that the issue is the DAC.

[edo69]

I think is always beautiful, even in this version.

[edo69]

Thank you a lot; I will send your post to the technician and I’ll update you on what will happen.

Kind regards.

[edo69]

Hello,

let me correct you:

the issue with the original Ic TDA1305T is that in 1-2 minutes the CD audio becomes mute, the CD keep spinning and the timer goes on while with other sources (radio, n. radio, n. music) there are no problems at all.

Individuated the Ic TDA1305T as the responsable of the issue by the technician, I providet to buy on Ebay n. 2 spare parts (original and brand new, they said).

When arrived, we replaced the original IC with a new one: we tested functioning, and after abour 30 sec. the cd signal became intermittent, then disappeared.

So we replaced the new Ic with the other new Ic; testing functioning, we had no sound at all.

Finally, we replaced the Ic with the original one, and everything came back the same as before (soun disappear in 1-2 minutes).

So we had 3 different responses by 3 different Ic’s.

What do you thingk about that?

• This reply was modified 3 months ago by edo69.

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