Amp has power, just no sound - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 23rd December 2014, 02:04 PM   #1
diyAudio Member
Join Date: Mar 2014
Default Amp has power, just no sound

Hi again, I'm back with a 4th project....

The people that have made comments and tried to help on previous questions have been a BIG help to me, being only a beginner at all of this, I know only so much...

I have another amp, a Harman Kardon HK-3380 integrated amp I just picked up for literally 8.

Problem is, the previous owner stated in a house move, it just stopped outputting sound, on when I got it I did all the basic external tests and nothing, I opened it up to find 2 of main 2 fuses had blown, so I bought 2 more, after that, switched on and the fuses did not blow, however, still no sound, not even a speaker hiss, but I found 2 of the transistor regulators right next to the main electrolytic caps were heating up to burning almost, so, I was thinking, in my knowledge of amps, they usually get stuck in speaker protect mode when a amp is switched on, but this amp switches on ok and I can hear the 2nd click of the speaker relay coming on.

The only other thing is that when I held it at a angle, it switched itself off, so maybe a broken cold solder joint?

I'll check all of this out for the basic issues shortly, but I'm thinking it has possibly 1 or more blown transistors?
  Reply With Quote
Old 23rd December 2014, 04:24 PM   #2
diyAudio Member
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
If the speaker relay pulls in, the power section is probably OK. Check and refer to the service manual for voltages.
__________________ For World Wide support for Flying Mole, Class D, Refurbishment and Repairs.
  Reply With Quote
Old 23rd December 2014, 05:15 PM   #3
diyAudio Member
Join Date: Jan 2008
Burnt fuses mean an excessive current which might have fried something before the fuses popped out. They never burn for no reason so you should avoid replacing them and turning a unit back on before doing a bit of probing and checkup in the concerned area.
Excessively hot regulators mean either they shorted to ground or that there is a massive current flow through them. The output relay reacts only to abnormal electric conditions at the speakers output, which means the fault might lie before that, for instance in preamp section which does not feed the signal. If the topology allows, start from unplugging all stages from the PSU and measuring all voltages there.
  Reply With Quote
Old 24th December 2014, 03:38 PM   #4
kevinkr is offline kevinkr  United States
diyAudio Moderator
kevinkr's Avatar
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Moving to solid state where power amplification is discussed.
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
T-Amp sound/power - Am I missing something? seawalker Class D 8 4th July 2012 10:01 AM
Why hi-power amp produce clearer sound & more details ... nina Solid State 113 4th October 2005 08:49 AM
Amp power but no sound RaspberryDonut Car Audio 4 24th June 2004 06:21 PM

New To Site? Need Help?

All times are GMT. The time now is 05:33 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2