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Old 16th February 2012, 10:03 PM   #1
diyAudio Member
Join Date: Feb 2012
Default Help with Lepai LP-2020a+

Hello I'm new to the forum and I bought one of those Lepai 2020a+ amps and I got it to my mailbox today.When I was gonna test it I used a 12 V 5A power supply(wich I later found out was AC) and I connected it and you culd hear the relay switch on and off constantly and afther a while a capacitor practically blew up and left alot of smoke and liquid.I didn't understood why it happend,I was assuming it had to do with the power supply and then I found out it was a AC output so I opend up the amp and replaced the capacitor and added a diode to the power suppy and started it,and it seemd to work so I connected it to the speakers and the input but I get no signal out to the speakers.And I also bypassed the relay but without any sucess.Now I wounder if there is some other component that may be fried so is there any way to troubleshoot and find what component is failing? I am not very familiair to this board as I just got it.
Thanks alot
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Old 17th February 2012, 01:35 AM   #2
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Location: Carlisle, England
You have probably blown the chip as well.
Murton-Pike Systems PCBCAD51 pcb design software.
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Old 17th February 2012, 04:36 AM   #3
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Location: Copenhagen, Denmark
Originally Posted by nigelwright7557 View Post
You have probably blown the chip as well.
I'd be very surprised if this isn't case.
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Old 17th February 2012, 09:09 AM   #4
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Join Date: Feb 2012
Originally Posted by nigelwright7557 View Post
You have probably blown the chip as well.
Ahh I was thinking that too,I will order a new chip from ebay and replace it and see if that fixes it thanks
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Old 14th September 2012, 08:43 AM   #5
Lucywy is offline Lucywy  United Kingdom
Join Date: Sep 2012
Location: GZ
Yeal ,blown the chip ,I met the problem before.
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Old 14th September 2012, 03:24 PM   #6
Bare is offline Bare  Canada
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Join Date: Dec 2001
Location: vancouver
Hmmm. Shorted out a speaker wire and blew a channel on mine.
Bought a replacement Lepai... not yet delivered tho. sigh.
Also bought a YuangJi
YJ TA2020 20W+20W Class D amplifier board | eBay
Which did arrive... after 2 weeks.
Frankly it's a Much! better circuit. (No box though) needing little if any 'Upgrading' unlike the Lepai which needs a Lot (most) of it's parts replaced.
PS: Ta2020 chips are available for $5 with free shipping... IF you want to bother with the Lepai ressurection ? Removing the chip from the PCB's through plated holes without ruining the pcb is.. not.. a trivial task

Last edited by Bare; 14th September 2012 at 03:27 PM.
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