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-   -   lp-2020a+ with no sound, no relay click, no nothing (http://www.diyaudio.com/forums/chip-amps/228891-lp-2020a-no-sound-no-relay-click-no-nothing.html)

leosep 29th January 2013 05:11 AM

lp-2020a+ with no sound, no relay click, no nothing
 
Hi all, I got this lepai lp-2020a+ from ebay, at first it worked ok but now no audio comes out from speakers, cant hear that click of the relay, no pop when powered, i opened the amp and tested with speakers bypassing the relay, capacitors, etc, but no nothing. Tested with various power suplies. also with one that i use with a lp-2020 model. The blue light is on. I waited with the amp powered on for more than 1 hour and nothing. Dont know what else to do. :confused:

leosep 29th January 2013 02:22 PM

anyone?

Bone 29th January 2013 10:11 PM

Buy a new one.

Skiivari 29th January 2013 10:42 PM

Might be a dead chip.
I had to replace mine after apparently shorting the terminals (maybe)

AndrewT 30th January 2013 11:25 AM

Apply the correct DC voltage to the relay coil.
Does it operate?

leosep 30th January 2013 12:07 PM

Yes, nothing...no click from relay

AndrewT 30th January 2013 12:57 PM

Short out the IN to OUT pins of the relay.
Does the music pass through to output?

leosep 30th January 2013 12:58 PM

Yes i did that too with but no sound.

Kyriarxos 30th January 2014 02:35 AM

Sorry to hear that; similar story here:

Short version: Mine gave up too after several days of happy post-surgery performance, after having replaced everything upgradeable.

Long version: Four plus days of burn in, then burn out. Found it shut off and the chip looked ok, but smelled bad; the fuse on the regulated 13,8v psu was burnt too. After replacing the fuse, the psu was no longer regulated at 13,8 but at 2x (!) that voltage! I found out the hard way, when, after changing fuse, the lepai wouldn't start at all (no led, no nothing). So, I plugged it on an audiophonics 2020 board and its chip literally blew up with a spark and had a silicon piece burst out leaving a crater on it... Add another amp and a psu destroyed during lepai-troubleshooting. Then took the lepai to a Kingrex psu, causing it to have its fuse blown, indicating that something is terribly wrong in there. Verdict: Three healthy devices and the lepai itself (with man-hours of modding on it) gone in one evening. Frustration...

The only way to start it up now is with a non-regulated fuse-less wall wart. When this happens the relays never click, whereas the chip & heatsink go very hot very quickly - didn't leave it on for more than seconds. Please note that right after all modifications the thing was running much cooler than before, cold to the touch on the outer casing that is. Oh, and the sound!!!

Question (not that I'm not going to try it anyway and post back, with pics should it resurrect) would be whether this lepai -and maybe most failing ones- might work again if the chip is replaced. Maybe 13,8v constant is too much? What do you think?

ricortes 31st January 2014 11:05 PM

Well you did ask for input.

Ditch Lepai, forget the 2020. If you look in class D amps here, you will find plenty of problems with the chip and general design i.e. tone controls. Switch to a Sure 2024 if you want a nicely built amp for about the same money. I haven't looked on eBay lately for them because mine has been working faultlessly for almost 5 years now.

The Sure isn't quite as complete at the Lepai, no volume knobs or case, but they use better components that are there and build quality can't be compared. I'd rather have a Sure 2024 in a cheese box then a Lepai in an anodized aluminum case.


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