LC Audio Zappulse 2.1 Issue

john65b · 11th March 2007, 02:18 PM

I again violated one of the most important rules in DIY - Never Solder while tired...

I had been happily using a pair of Zappulse 2.1 modules and got a a bug in my butt to upgrade the power supply from single supply to dual mono...somehow I tripped up the rail wiring and saw a nice puff of smoke...took out my tweeters of my KEFs too.

Anyway, I unhooked everything and went to sleep...next day I checked out the modules and saw the two resistors in front of the 2.2uf caps by the wiring inputs that looked charred...but all else from first glance looked OK...I reconnected everything (correctly) and got full rail voltage on the outputs.

After emailing LC Audio about some info and the resistor values (they were very protective of telling me anything value-wise) I replaced the two 20k resistors that I saw looked charred...LCAudio tech said he thinks its 20k, but not sure.

Anyway, it did not make a difference since I continue to get full rail voltage on the outputs...All the beefy resistors on the edges of the board look OK and seem to be fine, but wonder what else I could check/replace to get these two modules working again??

I gave up on the LC Audio tech, as all they could do is credit me $30 each module on a trade in for the newer modules...I didn't really like that option, and I have since built a UCD400AD that I am very happy with, but would still like to get these Zappulses working again...

Any help?

zkaiser · 11th March 2007, 03:37 PM

How about nice big, high res. picture of demaged module ? Top and bottop ofcourse...

john65b · 11th March 2007, 04:26 PM

No problem, I will post a pic later today...

zkaiser --> are you familiar with this type of issue??

zkaiser · 11th March 2007, 04:37 PM

Actually I was doing some rev. eng. on these modules.

john65b · 11th March 2007, 04:41 PM

Perfect!

I liked the LCAudio, but I really like the UCD400 better.

Just would like to get these working again...

Ya know, I might be able to send them to you so you can "do your thing" if you think you could advise me on how to get them operational again...

john65b · 12th March 2007, 02:30 AM

A few pics (crappy, but the wife has the good camera)

You can see the single resistor that was in front of the cap to the left...

john65b · 12th March 2007, 02:36 AM

Another

john65b · 12th March 2007, 02:37 AM

and another

john65b · 12th March 2007, 02:39 AM

And the last one...anyone care to point out what the likely culprits are? The connections were kinda crappy when I got it and left t as is (bought from fellow DIYer here on this thread...)

BWRX · 12th March 2007, 03:04 AM

Are the FETs damaged? Hint: check for a short circuit.

11th March 2007, 02:18 PM	#1
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	LC Audio Zappulse 2.1 Issue I again violated one of the most important rules in DIY - Never Solder while tired... I had been happily using a pair of Zappulse 2.1 modules and got a a bug in my butt to upgrade the power supply from single supply to dual mono...somehow I tripped up the rail wiring and saw a nice puff of smoke...took out my tweeters of my KEFs too. Anyway, I unhooked everything and went to sleep...next day I checked out the modules and saw the two resistors in front of the 2.2uf caps by the wiring inputs that looked charred...but all else from first glance looked OK...I reconnected everything (correctly) and got full rail voltage on the outputs. After emailing LC Audio about some info and the resistor values (they were very protective of telling me anything value-wise) I replaced the two 20k resistors that I saw looked charred...LCAudio tech said he thinks its 20k, but not sure. Anyway, it did not make a difference since I continue to get full rail voltage on the outputs...All the beefy resistors on the edges of the board look OK and seem to be fine, but wonder what else I could check/replace to get these two modules working again?? I gave up on the LC Audio tech, as all they could do is credit me $30 each module on a trade in for the newer modules...I didn't really like that option, and I have since built a UCD400AD that I am very happy with, but would still like to get these Zappulses working again... Any help?

12th March 2007, 03:04 AM	#10
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Are the FETs damaged? Hint: check for a short circuit. __________________ Brian

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11th March 2007, 03:37 PM	#2
zkaiser diyAudio Member Join Date: Feb 2005 Location: _	How about nice big, high res. picture of demaged module ? Top and bottop ofcourse...

11th March 2007, 04:26 PM	#3
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	No problem, I will post a pic later today... zkaiser --> are you familiar with this type of issue??

11th March 2007, 04:37 PM	#4
zkaiser diyAudio Member Join Date: Feb 2005 Location: _	Actually I was doing some rev. eng. on these modules.

11th March 2007, 04:41 PM	#5
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Perfect! I liked the LCAudio, but I really like the UCD400 better. Just would like to get these working again... Ya know, I might be able to send them to you so you can "do your thing" if you think you could advise me on how to get them operational again...

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