Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

class d tda8950 blown output resistor ... need fix
class d tda8950 blown output resistor ... need fix
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 27th January 2018, 03:46 PM   #1
dannyjmf is offline dannyjmf  Malaysia
diyAudio Member
dannyjmf's Avatar
Join Date: Feb 2010
Location: Mysia - Kuala Lumpur
Default class d tda8950 blown output resistor ... need fix

hi members ...

here i have a TDA8950 with its blown 22Ohms resistor which is the speaker out resistor. During the time it blows it was connected to a failed eq module which has oscilation issue ... that moment no speakers were connected to this tda8950 module when it happened ... there were pictures of the burnt mark shown

I intend to repair this amplifier module by replacing the blown 22Ohms resistor ... but since it is my first time working with class d amplifiers for repair ... if the output resistor blows, anything else should i look out for? now the amplifier module has been pulled out from its chassis and after the repair i would conduct a standalone test for it before re-installing it.

helps were really appreciated ...
Attached Images
File Type: jpg 4.jpg (54.3 KB, 77 views)
File Type: jpg 1.jpg (143.3 KB, 76 views)
File Type: jpg 3.jpg (158.7 KB, 75 views)
Mohamad Danny Al Saleh
  Reply With Quote
Old 27th January 2018, 05:20 PM   #2
theAnonymous1 is offline theAnonymous1  United States
diyAudio Member
theAnonymous1's Avatar
Join Date: Feb 2004
Location: Anonymityville
Without a load the output RC absorbs all of the high frequency resonance and you end up with your current situation. Replace the resistor and don't power it without a load again.
  Reply With Quote
Old 28th January 2018, 01:06 PM   #3
coolmaster is offline coolmaster
diyAudio Member
Join Date: Jul 2005
Location: MY
I was building a speed controller with this same module. Can't recall what I did, one 22ohm resistor smoked but not to the extent of open circuit. I promptly replaced with a same 1W metal oxide of the same value and its been trouble free since. This is after I made sure whatever connections are all correct. I don't think there's anything else to look for. The protection circuit should kick in if there's anything seriously wrong.
  Reply With Quote


class d tda8950 blown output resistor ... need fixHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Blown resistor in Aikido LV wingding611 Tubes / Valves 13 10th October 2017 12:16 PM
TDA8950 Class-D BTL Stereo Amplifier Board cRash1001 Class D 8 19th August 2017 10:43 AM
Blown screen resistor trombone Tubes / Valves 3 12th November 2012 04:51 PM
FLI 900s blown resistor Mx5Mayhem Car Audio 2 18th November 2011 10:33 PM
Blown up resistor in S-5 amp kit... fenpark15 Tubes / Valves 24 7th January 2008 02:40 AM

New To Site? Need Help?

All times are GMT. The time now is 02:00 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio