Need help troubleshooting an amplifier... - 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
Reply
 
Thread Tools Search this Thread
Old 13th December 2009, 08:15 PM   #1
SimonB is offline SimonB  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Chicago
Default Need help troubleshooting an amplifier...

I have a Telex EV SonicXS 4.1 sound system for my computer and I have had it for about five years. I've had a problem with it working properly. I'll turn it on and it makes a loud noise like AM-radio for about a minute, then that noise goes away and the subwoofer doesn't work and the satellite speakers sound like they are missing the treble. Then there's the AM-radio noise again and then suddenly a pop and everything sounds great. At least that's the way it usually happens.

Well I took apart the subwoofer which houses all of the amplifiers and crossovers. There are five small boards that look like the individual amplifiers for each speaker. There is a burnt smell and the board is burnt around the leads of a big resistor. The color coding on the resistor comes to 68 ohms, and I tested the resistance with my digital multimeter and it says 69 ohms so it looks good.

I can't find schematics anywhere online for this system. Are there any additional troubleshooting steps you guys can recommend?

Here are a couple pics of the amp and the burnt area on the board:

Click the image to open in full size.
Click the image to open in full size.
  Reply With Quote
Old 13th December 2009, 08:26 PM   #2
diyAudio Member
 
Join Date: Nov 2005
The picture shows a couple thermally worked solder joints for some signal resistors going by that over powered power resistor. The power resistor is fine, but retouching all those solder joints would be step one.
  Reply With Quote
Old 14th December 2009, 01:02 AM   #3
49 - for the 18th time
diyAudio Member
 
c2cthomas's Avatar
 
Join Date: Oct 2006
Location: Near "Music City" (Nashville Tennessee)
Seems that you have done the 1st thing which is a good visual check of things.
For something that is a thermal intermittent like this a shot of freeze spray Parts-Express.com:*ECG RX100-10 Antistatic Circuit Refrigerant 10 oz. | refrigerant freeze spray chiller chemical electronic chemicals in suspect areas can help to make the targeted component(s) act up. Some type of heat gun (hair dryer? don't let her catch you with it tho) to blow hot air can be helpful.
__________________
DIY audio can be expensive but getting to see things go up in smoke - that's priceless!!!! ..... "whatever - call it brainfart of Mighty ZM"
  Reply With Quote
Old 14th December 2009, 01:06 AM   #4
diyAudio Member
 
redrooster's Avatar
 
Join Date: Jan 2009
Location: Geraldton Western Australia
i would change those electrolitic caps next to the burn mark as well they might have dried out a bit.
  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
Amplifier Troubleshooting. 5th element Solid State 181 15th April 2009 04:20 PM
Help me troubleshooting amplifier module fosforo Solid State 15 7th November 2006 10:59 AM
help troubleshooting amplifier/receiver please JMB Solid State 6 25th October 2004 04:14 PM
amplifier troubleshooting question Randy Knutson Solid State 16 21st August 2003 03:15 PM
amplifier troubleshooting sriegel Solid State 0 6th April 2002 05:28 PM


New To Site? Need Help?

All times are GMT. The time now is 11:22 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