45.5 ohms with red lead on G, 45.6 ohms the other way. Thats with the board off of the heatsink
I'm wondering if that upper FET is zapped. It would be a very unusual failure mode but the reading seems to suggest it. It would give the overall voltage readings you are seeing with the fault.
I would replace that one FET making sure it is properly attached to the heatsink (but do not overtighten them though).
I would replace that one FET making sure it is properly attached to the heatsink (but do not overtighten them though).
Perhaps others will chime in ... back in the late 80's I worked at a place that used lots of the IRF hexfets. They almost always failed as dead shorts. I cut a couple of TO-3s open and all you would see is a small black spot somewhere on the top of the die. I suspect Q3, the NPN ZTX450 or C2 the 1000uF cap.
If it has just failed G to S then I think that would be unusual tbh. Q3 and C2 were my first thoughts but they have been eliminated.
lets hope that does the trick.
Hi,
just a short question. As I don't like notebook-type PSU-s (they don't look good 😀... yes, the eyes are listening too), but I'm very satisfied with the 24v MeanWell SMPS, I thought I take an internal type and mount it into a chassis, suitable to ACA. My choise (MEAN WELL RS-100-24 Switching Power Supply SMPS 100W 24V 4.5A) has only 4,5A instead of 5A of the original - would it be enough?
Thank you in advance.
just a short question. As I don't like notebook-type PSU-s (they don't look good 😀... yes, the eyes are listening too), but I'm very satisfied with the 24v MeanWell SMPS, I thought I take an internal type and mount it into a chassis, suitable to ACA. My choise (MEAN WELL RS-100-24 Switching Power Supply SMPS 100W 24V 4.5A) has only 4,5A instead of 5A of the original - would it be enough?
Thank you in advance.
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right and you can even put the 24v brick alongside the amp board itself without worries...
been there done that...
been there done that...
Has anyone gone through a lost/stolen package before?
Does DIYAudio handle the insurance claim on their end? or do I need to file a claim with USPS? If it's the latter, I need more information and I can't seem to get a response from DIYAudio. No response from DIYAudio, and not enough information to file the claim with USPS.
I'm sitting here with a case and no internals because the package with the internals was stolen on Oct 6. I haven't got a response back from DIYAudio in over a week. I sent in the police report they requested and asked for guidance. Is there a telephone number?
Does DIYAudio handle the insurance claim on their end? or do I need to file a claim with USPS? If it's the latter, I need more information and I can't seem to get a response from DIYAudio. No response from DIYAudio, and not enough information to file the claim with USPS.
I'm sitting here with a case and no internals because the package with the internals was stolen on Oct 6. I haven't got a response back from DIYAudio in over a week. I sent in the police report they requested and asked for guidance. Is there a telephone number?
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I would say the store would have to claim the lost shipment - you should be able to get a response from either Elena or Jason at the store helpdesk : contact@diyaudiostore.com
I have never had an issue with a response at that email address.
I have never had an issue with a response at that email address.
Maybe they took a week off? That's the email address I'm contacting. I was getting a response up until about 8-9 days ago. I just want an answer so I can get whatever claim started and re-order the parts again, if I need to. The excitement has just turned into frustration.
Bingo!! Replaced Q2 and all is good. Thanks to Mooly in particular for his 'measured' approach to finding the problem. I had to cut the legs on the suspect mosfet to remove it, desoldering was just too tricky for me.
and a really unusual failure mode. Good to hear its all back working.
That is desoldering…to be any good at it you have to use every trick you can think of.
But I had hoped not to destroy the suspect mosfet just in case it was ok, I'm a frugal diyer!!!