Bad Car Amps Gone Worse...

sousmielie · 19th June 2008, 11:30 AM

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.

sousmielie · 19th June 2008, 11:33 AM

pic1

sousmielie · 19th June 2008, 11:36 AM

pic2

sousmielie · 19th June 2008, 11:38 AM

pic3

MartyM · 19th June 2008, 06:54 PM

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.

I Am An Idiot · 23rd June 2008, 12:05 AM

I think these 4 transistors were a close to the upper end of their thermal limit.

I Am An Idiot · 23rd June 2008, 12:08 AM

The missing parts of the clamps made their way to the other side of the amp.

DigitalJunkie · 23rd June 2008, 12:36 AM

Quote:

I think these 4 transistors were a close to the upper end of their thermal limit.

WHAT transistors?!

Holy cow man.

sousmielie · 23rd June 2008, 06:23 AM

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...

Eva · 23rd June 2008, 08:11 AM

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...

19th June 2008, 11:30 AM	#1
sousmielie diyAudio Member Join Date: May 2005 Location: GP (Gangstas Paradise)	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Better dac = worse TV sound?	sharpi31	Digital Source	0	11th December 2008 09:29 PM
I must have the worse luck - Clarion EQ	pityocamptes	Car Audio	7	10th December 2007 02:26 AM
sacd better/same/worse dvd-a???	aaronboumans	Digital Source	20	27th February 2007 06:36 PM
DC heater noise WORSE than AC	arnoldc	Tubes / Valves	13	12th October 2004 01:23 AM
Better or worse sounding transistors	Ryssen	Parts	0	2nd February 2004 12:33 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

19th June 2008, 06:54 PM	#5
MartyM diyAudio Member Join Date: Oct 2006 Location: Monroe, North Carolina, USA	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)