Hi DIY enthusiasts
im fairly new into DIY stuff, ive taken basic electricity classes, so i know the basics of soldering and electrical components and stuff. Ive bought two lepai tripath LP-2020A+ amplifiers (the newest models, both have chips that say ta-2020 on them and have a ton of smt components and 2 op amps, they are the ones with the two yellow relays right behind the speaker outputs). My first one i fried the chip fairly badly, because one day, the volume couldnt be turned up very high before it would cut out (way lower than before) and then it just stopped working (constant pulsing blue light, no clicks, no sound)(actually on a side note, for a short time, with the volume all of the way up and no speakers connected there was a faint trace of the music being played, where it was coming from i dont know because there werent speakers connected)
anyway, i bought another one because i was quite impressed with the first one for its decent quality and low cost. this second one only lasted less than two weeks before it wouldnt work anymore. what happens is the blue light stays almost constantly on (you can tell it dims) on a 2 amp power supply and on a 3 amp power supply it turns on then slowly dims out and keeps repeating. on a less than 2 amp power supply it doesnt turn on at all
i started reading these threads and wondered if there was a way to fix this
the first thing that im going to do (once my soldering iron ships) is to replace the inductor near the power supply with a wire (a mod suggestion)
the next thing i was going to do was take out the zener diode, but on this new model i dont know which one it is (the one that sends it into the reboot sequence). other than that im not sure if theres anything i can do to fix it, and ill probably buy another one instead of just buying a replacement chip (it would be difficult for me to solder with my terrible skills)
is there anything else i can check? any common problem that is easy to fix? i have access to a digital multimeter
thanks!!
im fairly new into DIY stuff, ive taken basic electricity classes, so i know the basics of soldering and electrical components and stuff. Ive bought two lepai tripath LP-2020A+ amplifiers (the newest models, both have chips that say ta-2020 on them and have a ton of smt components and 2 op amps, they are the ones with the two yellow relays right behind the speaker outputs). My first one i fried the chip fairly badly, because one day, the volume couldnt be turned up very high before it would cut out (way lower than before) and then it just stopped working (constant pulsing blue light, no clicks, no sound)(actually on a side note, for a short time, with the volume all of the way up and no speakers connected there was a faint trace of the music being played, where it was coming from i dont know because there werent speakers connected)
anyway, i bought another one because i was quite impressed with the first one for its decent quality and low cost. this second one only lasted less than two weeks before it wouldnt work anymore. what happens is the blue light stays almost constantly on (you can tell it dims) on a 2 amp power supply and on a 3 amp power supply it turns on then slowly dims out and keeps repeating. on a less than 2 amp power supply it doesnt turn on at all
i started reading these threads and wondered if there was a way to fix this
the first thing that im going to do (once my soldering iron ships) is to replace the inductor near the power supply with a wire (a mod suggestion)
the next thing i was going to do was take out the zener diode, but on this new model i dont know which one it is (the one that sends it into the reboot sequence). other than that im not sure if theres anything i can do to fix it, and ill probably buy another one instead of just buying a replacement chip (it would be difficult for me to solder with my terrible skills)
is there anything else i can check? any common problem that is easy to fix? i have access to a digital multimeter
thanks!!
You claim to be impressed with the Quality?
Yet.. Both of your examples are Junk.
Likely you are mistaking Cosmetics for build quality.
Sadly, these are in a word: Worthless.
Move on, is my 'been there, done that', suggestion.
Yet.. Both of your examples are Junk.
Likely you are mistaking Cosmetics for build quality.
Sadly, these are in a word: Worthless.
Move on, is my 'been there, done that', suggestion.
If you never had any better you'd think it's high quality. When you had a HQ ta2020 like the amp6 you'd think it's crap.
Look for a short in the output filter section. Usually that's the inductor, cap and Zobel. That would cause the symptoms you report.
As for build quality, yeah - it very low. Reminds me of bad electronics from the 1970s.
That said, I have an old one that has been running 24/7 for more than 3 years. No trouble at all. Yes, I prefer the AMP6, my favorite.
As for build quality, yeah - it very low. Reminds me of bad electronics from the 1970s.
That said, I have an old one that has been running 24/7 for more than 3 years. No trouble at all. Yes, I prefer the AMP6, my favorite.
I design and build irs2092 amps and always use through hole components so they are easy to remove/replace.
Have you run the amp without a speaker ? Class d output filters can get very high voltages from the choke ringing if there is no speaker connected and it fries the filter capacitor. I did it a couple of times before I started fitting higher voltage filter capacitors.
Have you run the amp without a speaker ? Class d output filters can get very high voltages from the choke ringing if there is no speaker connected and it fries the filter capacitor. I did it a couple of times before I started fitting higher voltage filter capacitors.
- Status
- Not open for further replies.