Tripath repair required - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 22nd April 2011, 10:39 AM   #1
diyAudio Member
 
Join Date: Apr 2011
Default Tripath repair required

Hi,

I'm in need of some help with a repair job and my internet searching has led me here, I'm hoping I'm in the right place (and the right sub-forum).

I have a pair of audiodigit high-current stereo amps that from Autocostruire a few years back. Unfortunately, due to (we think) a faulty PC power supply on the same extension plug, one of them is broken. It turns on and the light comes on at the front but there's no sound.

My electrical knowledge barely goes past re-wiring plugs so I don't have the ability to identify the problem myself, let-alone repair it. It's a nice amp that I'd like to fix, as long as it's not price prohibitive, as I'm using them in a bi-amp set-up.

Can anyone recommend a repairer that would be happy to take a look and, if possible, fix it for me. Is anyone here interested in doing it? Obviously I'd pay shipping, parts and labour.

I'm located in Biggleswade, Bedfordshire, England.

Thanks in advance

Conrad
  Reply With Quote
Old 22nd April 2011, 12:16 PM   #2
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
Hi Conrad. Exactly which amps do you have. Are these the 2020 type?

The 2024 chip would expire if you accidentally touched the speaker wires together whilst attached to the amp. The 2020 chip is said to be "bridged" in the same way as the 2024 and may also be susceptible.

I have an Autocostruire 2020 board that I don't use which you could have at a very good price if you have the same boards.

Rob.
  Reply With Quote
Old 22nd April 2011, 12:57 PM   #3
diyAudio Member
 
Join Date: Apr 2011
the model I have is an APCT100HC, as I said they're a few years old and so they're not part of the current model range.

I've opened it up and I can see at least two things that look wrong:

1) One of the capacitors, a small blue one that sits near the chip and is labeled c2, has exploded. The plastic housing is loose and the two metal prongs and their connector are exposed. It's also distributed what looks to be a load of brown fluff about the inside of the case. At least I assume that's what's done it.

2) The actual chip is cracked. There are a number of cracks in it and some of the surface has come away. The worst crack seems to run about 3/4 of the height of the chip and goes as deep as the seam where it runs parallel to the surface. I'm guessing that's shot.

The board looks bridged. It's a 4x100 board into two outputs. The revision number is 10.1-03/2006. It says class t-amp 4x100 on it and the chip is labelled: taa4100a. underneath that it says MD0612.

In fact, I'm pretty sure that this is the board:
Autocostruire il negozio degli autocostruttori

It looks like all the connections are either plugs or screw fittings, the only exception is the light on the front. Does that sound right? It seems to tally up with what's in the wiring diagram.

Can it really be that easy to swap the boards over?
  Reply With Quote
Old 22nd April 2011, 02:03 PM   #4
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
The TAA4100A is one of the more rare Tripath IC's. You might have trouble sourcing one to do a repair.
  Reply With Quote
Old 22nd April 2011, 02:19 PM   #5
diyAudio Member
 
Join Date: Apr 2011
Is that not the same board in the link i gave then? The large image seems to have the same text printed on the chip and it mentions the same chip number in the description. Or did you mean sourcing a second hand one?
  Reply With Quote
Old 22nd April 2011, 02:52 PM   #6
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
I do not have that board. It would be a relatively simple job of substituting a new board for the old one if you can buy or find one.

If you need a hand I am happy to do it for you for postage costs only.

If you would like my credentials to make sure I am up to it, I modded many Tripath amps in the "Sonic Impact" craze some years ago, re-built a Trends T-Amp blown up by someone on another forum. Built several Gainclones, both single chip and bridged mono (point to point - no circuit board), Built my current amp a Pass F2 and Pass B1 buffer, modded many CD players and Dacs, built power supplies, modded several PS1's etc etc. If you would like any more info, send me a PM
  Reply With Quote
Old 22nd April 2011, 02:54 PM   #7
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Quote:
Originally Posted by Conradn View Post
Is that not the same board in the link i gave then? The large image seems to have the same text printed on the chip and it mentions the same chip number in the description. Or did you mean sourcing a second hand one?
I meant trying to source just the IC to fix your board.

BTW, 170EUR for that board is absolute insanity.
  Reply With Quote
Old 22nd April 2011, 05:26 PM   #8
diyAudio Member
 
Join Date: Apr 2011
Puffin, that's very kind. If I can find a board to replace the broken one (and get permission to buy it!) then I might take you up on that offer. I could likely do the swap over but it'd be nice to have the light working too.

theAnonymous1, I'll take a look for the chip as well as the board elsewhere although with one of the capacitors gone as well I would imagine it's going to be easier to replace the whole board. While 170EUR is a lot, to get the amp back up and running it might need to be done. I had a thought about swapping it for another board but then the amps would be mismatched and the whole bi-amp thing wouldn't work.

Any suggestions as to where I might be able to pick another one of those boards up from?
  Reply With Quote
Old 22nd April 2011, 07:02 PM   #9
diyAudio Member
 
Join Date: Oct 2009
41hz.com supplies amps that use Ta4100A and I believe chips as well.
Saul

sent from my phone
  Reply With Quote
Old 22nd April 2011, 07:59 PM   #10
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
Quote:
Originally Posted by slipton View Post
41hz.com supplies amps that use Ta4100A and I believe chips as well.
They sure do; I completely forgot about them.

17EUR + the cost to have someone repair the board sounds much more reasonable than 170EUR for a new amp board.

41Hz Audio:Tripath TAA4100A chip
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
assitance required with repair of harmon kardon ta600 reciver and amplifier Mr OBrien Solid State 1 21st September 2010 01:34 AM
Help required xyz9915 Power Supplies 5 8th October 2008 02:35 PM
Help required ! LarryN Parts 2 19th July 2004 01:05 AM
Help required martioz Swap Meet 3 2nd February 2003 03:42 AM
Help required please Andy G Multi-Way 0 29th November 2002 10:50 PM


New To Site? Need Help?

All times are GMT. The time now is 04:36 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2