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Beogram CD 5500 noise issue

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davidosborne436
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davidosborne436 posted on Wed, Feb 24 2021 10:33 PM

Wondering if anyone has any ideas that might help me narrow this down. When I play a cd I can just about hear some music underneath alot of distortion and white noise.....Is the the DAC? or what else?

Thanks. Appreciate it.

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Dillen
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Dillen replied on Thu, Feb 25 2021 7:20 AM

Most likely a missing voltage to the analogue stages.
Check C102/C202 for shorts and replace any burned related resistors.
If black ROE type capacitors are used, I suggest you replace all of them.

Martin

davidosborne436
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excellent. thank you

davidosborne436
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those capacitors look ok....anything else to check?

Dillen
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Dillen replied on Thu, Feb 25 2021 8:36 PM

Look ok?
Did you check them with an ohmmeter or did you just look at them?

Yes, check that both the positive and negative supply is present at the analogues stages.

Martin

davidosborne436
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i checked them with a voltmeter. There's the same power going thru both. I'll check the rest. Thanks. Really appreciate it.

Dillen
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Dillen replied on Thu, Feb 25 2021 9:36 PM

Power going through them?

Martin

davidosborne436
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davidosborne436
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burbigo3
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burbigo3 replied on Fri, Feb 26 2021 12:22 AM

Hey, you still have this noise issues ?

burbigo3
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burbigo3 replied on Fri, Feb 26 2021 12:22 AM

Hey, you still have this noise issues ?

davidosborne436
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yes. tried pushing all connectors in. I can just about hear some music under the white noise

Dillen
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Dillen replied on Fri, Feb 26 2021 7:19 AM

You don't measure power with an ohmmeter.
You measure resistance. And it should of course be done with the CD player unpowered.
What are the readings across the two capacitors I mentioned?

Are both the negative and positive supply present at the analogue stages (player powered)?
Voltage readings?

Martin

davidosborne436
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10 ohms for each capacitor. 

can you help with where to measure the analog stage please? I'm new to this...

 

Martin
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Martin replied on Thu, Mar 18 2021 4:58 PM

Hi!

Maybe you have a similar issue that I faced with my Beocenter 9500 CD which I just found out was caused by the DAC.

https://forum.beoworld.org/forums/p/46078/333530.aspx#333530

Locate the TDA1541A DAC chip and try to cool it with electronic freeze spray or just press a small heat sink against it to see if the sound/noise changes. If it does, in any way, you could try to replace the DAC.

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