Lepai T-Amp with TA2020 - Page 63

denztan · 11th September 2010, 03:43 PM

Thanks MikeHunt79!!

I'll do it as soon as i got my new Amp.. i just hope that it'll last longer

msj965 · 12th September 2010, 01:56 PM

Quote:

Originally Posted by denztan

Thanks MikeHunt79!!

I'll do it as soon as i got my new Amp.. i just hope that it'll last longer

Kamusta paniero

meron din akong lepai eh kaya nga lang nagluko.anyway balitaan mo nalang ako ng iyong amp.

amuppet · 14th September 2010, 03:29 PM

Hi all. I am, as the name indicates, a total muppet. Please forgive the unforgivable idiocy I'm about to describe. It will horrify you that such morons exist.

I plugged a 12V "AC adaptor" cable from an old Creative speaker system into a newly delivered Lepai LP-2020. The brick on the cable reads: PRI. : 230V~50Hz 320 mA; SEC. : 12V ~ 4.2A. The unit then started smoking, quite badly, and still stinks, several hours later. I am for now assuming I pumped AC into a DC-requiring input, and fried at least one if not more of the components

I have opened the case up to look for damage. So far the only visible damage I can see is to a small cylindrical (pointing up) brown component (that narrows in the middle, like a tall Oreo) nearest to the power input, standing on two 'legs'. It has no markings but the board has '5401' written near by.

I would really appreciate someone detailing my options here... how do I investigate / fix what's wrong?

Happy to post pictures if it helps.

iko · 14th September 2010, 03:32 PM

Definitely post a good photo of the part in question, and of that area.

denztan · 14th September 2010, 03:43 PM

Guys, i have received my new amp as i upgrade the resistors it's giving me a dc offset of 95mv for the right channela and 12volts on the right channel!!! what would cause this to happen? bad capacitor? bad resistor? also i have another 1 that humms as soon as i turn on the amp.. amy help will be much appreciated.

Msj965,
Wassup!?!?! i'll update you if i have any progress w/ the upgrades. i'll have the LM4562 coming in soon

amuppet · 14th September 2010, 03:59 PM

Happy to oblige - cheers for the speedy reply.

iko · 04:20 PM

I think it's an inductor. Probably a 10uH?

iko · 14th September 2010, 04:23 PM

Have a look at this schematic

Lepai T-Amp with TA2020

You might want to check all the components shown in the lower left corner, T1 and T2, the zener D1, etc.

denztan · 15th September 2010, 02:06 PM

Thanks for helping me figure it out... will try to change the inductors hopefully it'll fix the prob.

ikoflexer, thanks for the link

amuppet · 16th September 2010, 07:34 AM

hi ikoflexer - who were you replying to in your most recent replies?

14th September 2010, 04:16 PM	#627
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	I think it's an inductor. Probably a 10uH? Last edited by iko; 14th September 2010 at 04:20 PM. Reason: typo

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11th September 2010, 03:43 PM	#621
denztan diyAudio Member Join Date: Aug 2010	Thanks MikeHunt79!! I'll do it as soon as i got my new Amp.. i just hope that it'll last longer

14th September 2010, 03:29 PM	#623
amuppet diyAudio Member Join Date: Sep 2010	Hi all. I am, as the name indicates, a total muppet. Please forgive the unforgivable idiocy I'm about to describe. It will horrify you that such morons exist. I plugged a 12V "AC adaptor" cable from an old Creative speaker system into a newly delivered Lepai LP-2020. The brick on the cable reads: PRI. : 230V~50Hz 320 mA; SEC. : 12V ~ 4.2A. The unit then started smoking, quite badly, and still stinks, several hours later. I am for now assuming I pumped AC into a DC-requiring input, and fried at least one if not more of the components I have opened the case up to look for damage. So far the only visible damage I can see is to a small cylindrical (pointing up) brown component (that narrows in the middle, like a tall Oreo) nearest to the power input, standing on two 'legs'. It has no markings but the board has '5401' written near by. I would really appreciate someone detailing my options here... how do I investigate / fix what's wrong? Happy to post pictures if it helps.

14th September 2010, 03:32 PM	#624
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Definitely post a good photo of the part in question, and of that area.

14th September 2010, 03:43 PM	#625
denztan diyAudio Member Join Date: Aug 2010	Guys, i have received my new amp as i upgrade the resistors it's giving me a dc offset of 95mv for the right channela and 12volts on the right channel!!! what would cause this to happen? bad capacitor? bad resistor? also i have another 1 that humms as soon as i turn on the amp.. amy help will be much appreciated. Msj965, Wassup!?!?! i'll update you if i have any progress w/ the upgrades. i'll have the LM4562 coming in soon

14th September 2010, 04:23 PM	#628
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Have a look at this schematic Lepai T-Amp with TA2020 You might want to check all the components shown in the lower left corner, T1 and T2, the zener D1, etc.

15th September 2010, 02:06 PM	#629
denztan diyAudio Member Join Date: Aug 2010	Thanks for helping me figure it out... will try to change the inductors hopefully it'll fix the prob. ikoflexer, thanks for the link

16th September 2010, 07:34 AM	#630
amuppet diyAudio Member Join Date: Sep 2010	hi ikoflexer - who were you replying to in your most recent replies?