Bad Car Amps Gone Worse... - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 19th June 2008, 12:30 PM   #1
diyAudio Member
 
sousmielie's Avatar
 
Join Date: May 2005
Location: GP (Gangstas Paradise)
Angry Bad Car Amps Gone Worse...

I hate it when people bring me cheap and nasty amps for repair, but I think this one took the cake... Brand new out of the box connect power and woooof flames. The amp was pasted full of QC and QA stickers, but they didn't notice the one mosfet's gate leg shorted to drain.

I'd like to see anyone elses amps gone BAD.
  Reply With Quote
Old 19th June 2008, 12:33 PM   #2
diyAudio Member
 
sousmielie's Avatar
 
Join Date: May 2005
Location: GP (Gangstas Paradise)
pic1
Attached Images
File Type: jpg dsc013351.jpg (44.8 KB, 565 views)
  Reply With Quote
Old 19th June 2008, 12:36 PM   #3
diyAudio Member
 
sousmielie's Avatar
 
Join Date: May 2005
Location: GP (Gangstas Paradise)
pic2
Attached Images
File Type: jpg dsc013341.jpg (44.3 KB, 507 views)
  Reply With Quote
Old 19th June 2008, 12:38 PM   #4
diyAudio Member
 
sousmielie's Avatar
 
Join Date: May 2005
Location: GP (Gangstas Paradise)
pic3
Attached Images
File Type: jpg dsc013311.jpg (53.9 KB, 497 views)
  Reply With Quote
Old 19th June 2008, 07:54 PM   #5
MartyM is offline MartyM  United States
diyAudio Member
 
MartyM's Avatar
 
Join Date: Oct 2006
Location: Monroe, North Carolina, USA
Send a message via Yahoo to MartyM
I didn't take a picture, as it happened accidentally, but in one of my Planet Audio amps I, while collecting data to build my own SMPS, touched the PWM chips' MOSFET lines to voltage with my meter probe.

A lot of flames shot out, lots of smoke, and it was quite a sight!

Repairing that myself was a good learning experience.
  Reply With Quote
Old 23rd June 2008, 01:05 AM   #6
diyAudio Member
 
Join Date: Mar 2007
I think these 4 transistors were a close to the upper end of their thermal limit.
Attached Images
File Type: jpg cimg2814.jpg (81.9 KB, 471 views)
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 23rd June 2008, 01:08 AM   #7
diyAudio Member
 
Join Date: Mar 2007
The missing parts of the clamps made their way to the other side of the amp.
Attached Images
File Type: jpg cimg2815.jpg (92.2 KB, 456 views)
__________________
If it ain't broke Don't fix it
  Reply With Quote
Old 23rd June 2008, 01:36 AM   #8
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Quote:
I think these 4 transistors were a close to the upper end of their thermal limit.


WHAT transistors?!

Holy cow man.
  Reply With Quote
Old 23rd June 2008, 07:23 AM   #9
diyAudio Member
 
sousmielie's Avatar
 
Join Date: May 2005
Location: GP (Gangstas Paradise)
Quote:
Originally posted by I Am An Idiot
I think these 4 transistors were a close to the upper end of their thermal limit.

I think that amp got thrown away, would have been a nightmare to repair...
  Reply With Quote
Old 23rd June 2008, 09:11 AM   #10
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
Quote:
Originally posted by I Am An Idiot
I think these 4 transistors were a close to the upper end of their thermal limit.
This can't be real. Internal transistor bond wires or the own leads would have got fused before so much damage was done. I've repaired plenty of 12V push-pull SMPS with burned MOSFET and damage never went so far. It looks like someone having a boring day found a blowtorch...
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  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
Better dac = worse TV sound? sharpi31 Digital Source 0 11th December 2008 10:29 PM
I must have the worse luck - Clarion EQ pityocamptes Car Audio 7 10th December 2007 03:26 AM
sacd better/same/worse dvd-a??? aaronboumans Digital Source 20 27th February 2007 07:36 PM
DC heater noise WORSE than AC arnoldc Tubes / Valves 13 12th October 2004 02:23 AM
Better or worse sounding transistors Ryssen Parts 0 2nd February 2004 01:33 AM


New To Site? Need Help?

All times are GMT. The time now is 08:39 PM.


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