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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Kristian95 on May 13, 2008, 01:49:17 AM
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Alas my A4000T has now developed the crackling sound issue I've read about the need to change capacitors, but I am not up for that task myself... is anyone doing these kinds of repairs (preferably in the US, but worldwide is ok)?
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This is the only guy I know of here in the US:
http://www.amiga-news.de/en/news/AN-2007-12-00002-EN.html
I can't say firsthand, but I've heard other members highly recommend him.
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cool... is there any way to contact him by e-mail by chance ?? :)
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Your caps are leaking on the A/V module board. Just buy a new one.
Or you could have the caps replaced.
I could do the repair for ya..as long as you pay for the capacitors. Im located in
NY.
Rich
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I'd be happy to pay for the caps as well as buy you a couple of brews :) I'll PM you details :)
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Vesalia.de sells the a/v module for 20 euros.
Regards,
Lloyd
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I saw that, but I am wondering how long the caps on those modules will last... and if I can save my hardware for the same (or lesser) amount I'd do that, just to keep more miggy hardware available :)
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Hey Kristian,
I can help you out with leaky caps:
http://www.amiga.org/gallery/index.php?n=2353
I'm in NorCal if you feel like driving ;-)
Cheers
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@da9000
Cool!! I am in the Bay area myself, between SF and San Jose :)
Btw, would you be able to do a replacement of Caps on other parts of my miggy too (just for safetys sake) :)
Cheers,
Kristian
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da9000 wrote:
Hey Kristian,
I can help you out with leaky caps:
http://www.amiga.org/gallery/index.php?n=2353
I'm in NorCal if you feel like driving ;-)
Cheers
Couldn't you make the picture any bigger? :-D :pint:
Seriously, how'd you get the great pic? (Mine turn out like the stuff out of a cows rear end ).... :-(
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@da9000:
PM sent ;)
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it probably is the caps, but another cause of crackly sound, i had pointed out to me by the good people of this forum, is that maybe your -12V line isn't minus twelve volts anymore?
my old A4000T used to eat PSU's on a yearly basis. it was so fully loaded and be drawing so much current on the 5V line, that the crappy AT type power connectors in the PSU plug (bendy thin bits of copper) would have melted away. new PSU required. just thinking this may have manifested itself in some other symptom...
might be advisable to check with a new PSU. unless of course, you can see leaking gunk comming out of the caps :-D in which case, i'll shut up :-)
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ah ok... I'll open the puppy and take a look...
It's not that loaded though.... it has a P-IV card, the CSPPC card, an eFlash card, a SCSI cd-rom drive and an cf card as harddrive... all in all the psu ought to be able to handle that :)
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I checked the audio module. While there isn't guhnk all over it, two of the capacitors had sort of a bit of "spider web" liks stuff by the side and the solder on one side of them is not shiny anymore... so I think the caps have only just started leaking (??)
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@Kristian:
Sorry for the delayed response. I've been quite busy and hadn't checked back :-/
We're practically neighbors! I'll email ya.
And yes, I'd replace'em all, just to be safe, because they WILL leak in the future (or dry up).
From your description further down, it sounds like it's the leaky caps that's your problem.
@vk3heg:
Quality beats quantity! :-)
But seriously, I used the macro feature of my digital camera, and I was able to come close. Use plenty of light, so that way the photos don't come out shaky. If you use flash from close range, I put some paper or something to dampen the brightness and get less specular highlights (which makes things hard to see as they become totally white).
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@da9000:
Super got the e-mail, no worries about the delay :)
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Kristian95...
take a look at the images I have posted here..
pretty good close-ups of my A/V module
Rich
ny
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@Vlabguy1:
Wow, that looks worse than my board for sure... I think my board has only just begun to leak, in any case replacing the caps with better (safer) ones will make sense no matter what :)
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Agreed. I did not replace mine..I opted for new boards instead. You might want
to inspect your mother board while your at it. as I found a few suspect caps
there as well.
Good luck
Rich
ny
quote]
Kristian95 wrote:
@Vlabguy1:
Wow, that looks worse than my board for sure... I think my board has only just begun to leak, in any case replacing the caps with better (safer) ones will make sense no matter what :)[/quote]
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agreed, I'm planning on replacing _all_ caps in my miggy, on the motherboard, daughterboards and expansionboards (if any caps are present).... better safe than sorry :)
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Glad I checked out this thread :-D
-D-: and anyone else who cares, the guy listed on amiganews.de , Ed Jeffries does a great job on fixing miggies. He repaired a dead parallel port on my first 4000, and I got my 'refurbished' 4000/WarpEngine from him as well.
Darksun: Hmm, my 4000T is acting up like yours was.... Doesn't seem to provide enough power, but on the +12V line, could this be leaky caps too? Ugh, will have to pack it up and send it to Ed Jeffries....
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it seems the most important site was not mentioned:
http://amiga.serveftp.net/audio_repair.html
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Question for DA9000: Are you able to replace other SMT components by any chance? I've got three A4000S that all have something wrong with them, and one has a dead clock chip.
I'd do it myself, but I don't have any SMT rework equipment.
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@Marcfrick2112
the big hint i got that something was not right was the brown burn marks on the PSU's power connector plugs. after unplugging them and looking inside the plugs, (not the socket on the mainboard, that was ok *phew*), some of the connectors had almost burnt down to thin whispery wire.
my A4000T when i sold it, had a CSPPV060 with CVPPC, 64+16MB ram, digital broadcaster32, AD516, CV64/3D, Vlab Y/C, and an opalvision / hydra ethernet all drawing off the mainboard power supply.
AFAIK, it's still currently serving time dishing up interactive displays at the imperial war museum.
sorry to hijack the thread. :-)