MRV-T500 internal clicking noise problem - Page 2 - diyAudio
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Old 7th July 2010, 11:37 PM   #11
Beerad is offline Beerad  United States
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Yeah I was worried about the crack running. It's not visible from the other side though, buuut as you said it's coming close to another trace. The second pic of the crack is a more accurate representation of the actual line. I think it starts at the solder joint on the left side. I plan on using this in the home though where it shouldn't be very stressed so I'm hoping it will be fine as is... *crosses fingers* maybe I'll just drill it out... another good idea. Thanks again for the help guys!
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Old 8th July 2010, 02:53 AM   #12
Beerad is offline Beerad  United States
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Well damn, I drilled it and bridged the connection... all went smoothly... no more cutting off but it still has the clicking... grrrr heh. Seems better though... sometimes goes away completely. Also there WAS a couple other joints that looked cracked possibly. On the big round coiled thingie next to the inductor... two of them right next to each other. I dunno what I was thinking. I should have just touched them while I had the iron out and amp apart... doh... it wouldn't have hurt. I'll have to do that........
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Old 8th July 2010, 03:36 PM   #13
Beerad is offline Beerad  United States
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Went over the points on the board... still clicking. It seems like since I fixed the crack it will now click faster (every second)but not as violently. Though when you drive it... it will click less but then seems to be triggered by the bass hitting as it clicks immediately after. Eventually it pretty much disappears though... weird. Any ideas?
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Old 8th July 2010, 05:10 PM   #14
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Does the audio play cleanly through the speakers?
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Old 8th July 2010, 08:26 PM   #15
Beerad is offline Beerad  United States
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Yes, it sounds flawless through the speakers. Just like the others I have. Even at high volumes... and doesn't have a heat problem or anything. If anything it seems to help. When it gets warmed up the clicking pretty much disappears all together... once in a while the clicking will fade in and back out a few times and that's it. All the functions work. Though when you change the phase it will pause the clicking for a moment.
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Old 9th July 2010, 12:20 AM   #16
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I have no experience with this amp but it's possible that the clicking is normal. There are quite a few amps that make strange sounds internally during normal operation.
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Old 9th July 2010, 02:07 AM   #17
Beerad is offline Beerad  United States
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Yeah I was wondering if that was a possibility. Though I have two other MRV-T500s, a MRV-T501 and two more that don't work, two MRV-1000s (apart from the one mentioned earlier), and a MRV-1005 that doesn't work too... all similar if not identical and none ever did this. I was going to disregard the clicking though and call it good since it works fine... just won't be using in the application I planned to but no problem with all the amps I have lol.

That leads me to another question... the three amps I just mentioned that don't work (two mrv-t501's and a mrv-1005) all were connected to my home stereo powered using computer power supplies and left on overnight during a bad storm. No surge protector. *sighs* When it happened there was no smell or anything. They were still on and still come on with no problem but the mrv-1005 doesn't have any output at all and the mrv-t501's act indentically as they have some output but it's not consistent at all... fading in and out and sometimes seeming to surge. Any idea what could be up or be wrong with 'em? Thanks again for the help Perry...

Last edited by Beerad; 9th July 2010 at 02:16 AM.
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Old 9th July 2010, 02:25 AM   #18
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What is the DC voltage on the B+ and ground terminals when the amps don't produce audio?
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Old 9th July 2010, 05:22 PM   #19
Beerad is offline Beerad  United States
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They're getting 12 volts... but I also tested the speaker terminals and they were fluctuating back and fourth quickly between 0.01 and 1.58 volts. The B+ to ground reading also fluctuates quite a bit where as it doesn't on a working amp. No fluctuations at the speaker terminals of the working amp either but instead 0.00 as I'd think it should be when it's not driving a signal.

Also, just realized that the MRV-T500 I had worked on will not stay on with out a speaker connected. It clicks of course and shuts itself off after about 5 seconds or so... then comes back on after a few more seconds. I don't think that is normal eh? heh
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Old 9th July 2010, 08:44 PM   #20
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It sounds like they may have shorted output transistors. Have you checked that in each one?
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