MHZS CD33E Blue tube light going out - diyAudio
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Old 12th July 2010, 12:00 AM   #1
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Default MHZS CD33E Blue tube light going out

The blue light illuminating one of the tubes on my CD33E player appears to be going out. It's on for the first few minutes after I turn on the player, then it blinks for a bit, then it goes off. The next time I turn the player on it starts all over. The player plays fine otherwise. I'm wondering if this could be caused by something other than the lamp itself? Should I be worried that this might be a symptom of a bigger problem developing. Thanks!
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Old 12th July 2010, 03:01 AM   #2
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That is just a blue LED light.
Don't know if it is similar: I had a cheap car CD player with blue LED illuminated face plate that was doing the same. The LED's (or their driver) where heating up and turn off after 30 seconds. Didn't care to fix it... Eventually stopped working altogether.
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Old 12th July 2010, 01:16 PM   #3
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Thanks for the reply. Just so I'm clear, are you saying its the LED because you're familiar with the electronics of this unit or because you believe it's probably similar to the CD player you describe? I'm hoping to get an answer from some that knows this unit well so I can have peace of mind.
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Old 12th July 2010, 04:59 PM   #4
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I would also like to here something on that same issue with MHTZ 33E !
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Old 12th July 2010, 05:56 PM   #5
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Cool MHTZ 33E cd player

I'm also very interested in the answer for that very same question about
the MHTZ 33 E player .
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Old 12th July 2010, 06:01 PM   #6
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There is no blue light in a vacuum tube, so it must be a LED in the socket... something like is described here.

Last edited by SoNic_real_one; 12th July 2010 at 06:04 PM.
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Old 12th July 2010, 06:14 PM   #7
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I realize there is no blue light in a tube and I know that there is an LED underneath the tube. Thank you for your response but this is not new information.

I'm looking for someone that is familiar with the circuitry inside this player to tell me whether the LED could be going out as a result of something else in the unit going bad. Is it just a bad LED or are there other possible reasons behind the issue? Once again, everything else seems to be working fine but I want to be sure this is not a possible symptom of a bigger problem that's just starting to surface.

I'd also be curious to know if anyone familiar with this unit knows where to get a replacement LED?

Thanks to all.
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Old 12th July 2010, 10:56 PM   #8
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Even without knowing the particular piece of equipment it's possible to say that it's unlikely that it's indicative of a serious developing fault. The LED and associated series resistor are in parallel with one or more other components across some voltage amongst the supply voltages inside the unit. It's possible for the series combination to fail due to e.g. a dry joint or an actual component fault without the functioning of any other parts being affected. As you say, nothing else seems affected.

w
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Old 12th July 2010, 11:16 PM   #9
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Quote:
Originally Posted by SoNic_real_one View Post
There is no blue light in a vacuum tube, so it must be a LED in the socket... something like is described here.
It is very rare for an LED to fail.
They usually fail because they havent been treat properly i.e. wrong or reversed volts to them or overheated.
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Old 13th July 2010, 04:28 PM   #10
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I have seen plenty of blue LED's fail. Not uncommon at all, in my experience. So, either the LED is failing or it's solder connections are. Either way, this useless LED is not in any way tied in with the operational condition of the unit.
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