Harman Kardon AVR 220 no sound - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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
Reply
 
Thread Tools Search this Thread
Old 4th April 2015, 12:48 PM   #1
sonyzz is offline sonyzz  Lithuania
diyAudio Member
 
Join Date: Nov 2013
Location: Lithuania
Unhappy Harman Kardon AVR 220 no sound

So i have Harman Kardon AVR 220 receiver and when i power it it shows everything, but there is no sound coming trhu the speakers tried all inputs and all outputs, tried reseting, tried visually detect blown parts like capacitor or resistor visually they look good, i found service manual on internet, downloaded it looked for schematics and find out that all inputs go thru some sort of decoding board, because wires comes to this bord, then goes out to the main amp and then next one, plus to headphone out, i will be trying to plug headphones and see if if there is a sound from them but i dont have 3.5 - 6.3mm adapter right now, also i've seen that mosfets on main amplifier was soldered by a technician maybe, because solder joins doesnt look like others - made by factory... so i wanted to ask for the help if someone had similar problem and knows how to repair it? dont say - go to repair shop, because i've already tried that and they said that they dont repair harman kardon receivers....
  Reply With Quote
Old 7th April 2015, 11:23 AM   #2
diyAudio Member
 
Join Date: Jul 2003
Location: Dona paula, Goa
If you know how to check for dry solder, do it.
Next, try soldering the ics that normally remain powered in stabdby. This involves the system controller.
You can check whether the power amps work if the speaker relay comes on. If this works, then you have serious problem. Looks like somebody already tried this.

If the above does not solve the problem, then nothing can be done except by HK.

Gajanan Phadte
  Reply With Quote
Old 9th April 2015, 05:14 PM   #3
sonyzz is offline sonyzz  Lithuania
diyAudio Member
 
Join Date: Nov 2013
Location: Lithuania
Quote:
Originally Posted by gmphadte View Post
If you know how to check for dry solder, do it.
Next, try soldering the ics that normally remain powered in stabdby. This involves the system controller.
You can check whether the power amps work if the speaker relay comes on. If this works, then you have serious problem. Looks like somebody already tried this.

If the above does not solve the problem, then nothing can be done except by HK.

Gajanan Phadte
I didn't found bad soldering, i didn't open the front panel yet, but tried using method witch i saw on youtube video - tried connecting to all inputs and see if they work with headphones but got nothing, amps also dont work, click sound can be heard when receiver comes out of the st-by mode, display shows everything but no sound from all outputs, even heaphone jack, all inputs seems to come in to special big board i think its dsp board tryed to take it out but i dont want to break it. It was given by my friend, witch he founded, to be thrown away to dump in norway, he said "you might fix it, because its working but has no sound"

Last edited by sonyzz; 9th April 2015 at 05:17 PM.
  Reply With Quote
Old 10th April 2015, 08:33 AM   #4
diyAudio Member
 
Join Date: Jul 2003
Location: Dona paula, Goa
Its nice to have something like that, more nice if it had been working. You don't loose anything if nothing improves with your attempts, only your time.

You can check whether the power amp works...
Finding the power audio amps, you can check whether it is working, just by cliking with a screwdriver. If it doesn't give that annoying noise in the speakers or the headphone...further it is your adventure.

Enjoy

Gajanan Phadte
  Reply With Quote
Old 10th April 2015, 09:50 AM   #5
diyAudio Member
 
Join Date: Sep 2014
Location: Pretoria, South Africa
Hi Sony

I'm a total noob when it comes to amplifier repairs but im trying to teach myself how to do it. I had a Harman Kardon AVR 2550 for along time that switched on like normal,
it had the same symptoms as yours, relay clicked switching the amp section on and everything but no matter what I connected to it, there was no sound at all.

After extensive testing of what I thought was problematic parts, I couldn't get anykind of readings but then I figured out that everytime I touched one of the probes to the amps chassis, I got a reading from the output transistors and other components. I realised that there were a lot of screws missing in the amp. Not sure if this applies to all Harman Kardon amps but all or most of the pcb's in the amp have bare contacts on the solder side of the board that needs to be grounded properly on the chassis, it this isn't done, then the amplifier will not work and pass any current or signal. So I suggest you look and make sure that every screw is in its place and if not, replace any missing screws, hopefully its a ground issue and grounding all the major components will turn the amplifier section on and give you readings.

Vishen
  Reply With Quote
Old 10th April 2015, 02:17 PM   #6
sonyzz is offline sonyzz  Lithuania
diyAudio Member
 
Join Date: Nov 2013
Location: Lithuania
Quote:
Originally Posted by gmphadte View Post
Its nice to have something like that, more nice if it had been working. You don't loose anything if nothing improves with your attempts, only your time.

You can check whether the power amp works...
Finding the power audio amps, you can check whether it is working, just by cliking with a screwdriver. If it doesn't give that annoying noise in the speakers or the headphone...further it is your adventure.

Enjoy

Gajanan Phadte
i did found that there is separated board for rear speakers of the channel, and i finded out that all inputs goes to some kind of dsp board that i mentioned earlier, from there most of the inputs goes to main amp (front speakers, center, sub) and two of them goes to separated amp ( rear speakers) so i was wondering if i can plug those inputs from dps bord out, and give the signal to that separated amp - from elsewhere like mp3 player to see if its working... there is lots of transistors on that board and its big, and one thing its smells like something was burned there.
  Reply With Quote
Old 11th April 2015, 11:10 AM   #7
diyAudio Member
 
Join Date: Oct 2012
the few avr 220's i've had for repair (no sound) all turned out to be low voltage regulator troubles and two required replacement of the ic handling the incoming audio for vcr 1 (not sure why i can only assume whatever source device was used killed this input)
before re-routing signal to amp sections try to find where the trouble is.
  Reply With Quote
Old 11th April 2015, 02:17 PM   #8
sonyzz is offline sonyzz  Lithuania
diyAudio Member
 
Join Date: Nov 2013
Location: Lithuania
Quote:
Originally Posted by turk 182 View Post
the few avr 220's i've had for repair (no sound) all turned out to be low voltage regulator troubles and two required replacement of the ic handling the incoming audio for vcr 1 (not sure why i can only assume whatever source device was used killed this input)
before re-routing signal to amp sections try to find where the trouble is.
i think that trouble is in that "dsp" board i tried to remove it but it wont come out that easy as i thought i dont want to break it, i will try again, that board has lots of caps transistors toshiba chip and lots of other smd ic's
  Reply With Quote
Old 11th April 2015, 02:20 PM   #9
sonyzz is offline sonyzz  Lithuania
diyAudio Member
 
Join Date: Nov 2013
Location: Lithuania
Quote:
Originally Posted by AudioJunkie7 View Post
Hi Sony

I'm a total noob when it comes to amplifier repairs but im trying to teach myself how to do it. I had a Harman Kardon AVR 2550 for along time that switched on like normal,
it had the same symptoms as yours, relay clicked switching the amp section on and everything but no matter what I connected to it, there was no sound at all.

After extensive testing of what I thought was problematic parts, I couldn't get anykind of readings but then I figured out that everytime I touched one of the probes to the amps chassis, I got a reading from the output transistors and other components. I realised that there were a lot of screws missing in the amp. Not sure if this applies to all Harman Kardon amps but all or most of the pcb's in the amp have bare contacts on the solder side of the board that needs to be grounded properly on the chassis, it this isn't done, then the amplifier will not work and pass any current or signal. So I suggest you look and make sure that every screw is in its place and if not, replace any missing screws, hopefully its a ground issue and grounding all the major components will turn the amplifier section on and give you readings.

Vishen
im still noob when it comes to audio tech too, i made few projects https://sites.google.com/site/1sonyz...nika/projektai (use google translate, because its in my native language) but i dont feel that proud of myself now, i dont made anything past half year...
  Reply With Quote
Old 11th April 2015, 02:52 PM   #10
diyAudio Member
 
Join Date: Oct 2012
so all the supply line voltages are ok? they must be since you've already narrowed it down to the DSP section. any leads as to what's producing the burnt smell?
  Reply With Quote

Reply


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
Faulty Harman Kardon AVR 230 Dave Zan Solid State 44 2nd January 2014 09:28 AM
Harman Kardon AVR 10 halloweenguy Everything Else 6 1st February 2010 05:52 PM
Harman Kardon AVR 120 SoNic_real_one Solid State 0 16th November 2009 03:20 AM
Harman Kardon avr 20mkII, need help! skyy Solid State 0 31st January 2005 06:42 AM


New To Site? Need Help?

All times are GMT. The time now is 02:21 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2