Brax X1400 blown fets. Help. - Page 3 - 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 1st December 2012, 08:16 PM   #21
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I wouldn't try removing that part just yet, Unless the holes are very large around the wires, it may be very difficult to get back in.

Since the leads are so short, it would be very difficult to get it back in if there is something on top of the board to make it stand off more than it does now.

One alternative may be to run wires from the top of the ground terminal to the top of the power stabilizer ground terminal using ring terminals at the blocks.
  Reply With Quote
Old 1st December 2012, 09:57 PM   #22
diyAudio Member
 
jeanious2011's Avatar
 
Join Date: Nov 2010
Location: Texas
Yeah if there is space for it, that's what I'll do. The only reason i would want to remove the unknown component is to make sure there's no other damaged traces. It seems its just the ground thats open, but you never know.


But as you stated it its pretty risky removing it and not being able to solder it back on, so it does worry me.

I'll keep the kapton film "trick"in mind that's what I'll have to do just to prevent any short of shorts. Should i be worried about the IC's, would they be likely damaged due to the user mistake?
  Reply With Quote
Old 1st December 2012, 10:07 PM   #23
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It's possible that the primary-side ICs were damaged but you can check them when you pull the FETs. Temporarily jump the ground and power up the amp. Does the 494 produce a clean square wave on pins 9 and 10 (assuming that pins 8 and 11 are connected to B+)?
  Reply With Quote
Old 1st December 2012, 10:15 PM   #24
diyAudio Member
 
jeanious2011's Avatar
 
Join Date: Nov 2010
Location: Texas
Okay I'll remove the fets and temporary jump the ground terminals. I'll check the wave forms tonight it as soon as i get a chance.
  Reply With Quote
Old 2nd December 2012, 03:38 PM   #25
diyAudio Member
 
jeanious2011's Avatar
 
Join Date: Nov 2010
Location: Texas
KOk i remove the fets. But i was looking closer at the unknown component and i believe is a transformer and if i do as you (Perry) say then I'll be bypassing it. Don't know if its okay to bypass it or not.

Below is a pic showing the traces below the unknown component. All ground pins had continuity between them as well as the positive.

Click the image to open in full size.
  Reply With Quote
Old 2nd December 2012, 04:01 PM   #26
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I think that they are a group of inductors. If so, bypassing them won't hurt anything, especially not for testing. It's not likely to be a transformer because there is nothing to drive it.
  Reply With Quote
Old 2nd December 2012, 04:17 PM   #27
diyAudio Member
 
jeanious2011's Avatar
 
Join Date: Nov 2010
Location: Texas
OK. I'll power it up and check the ic's.

Perry this amp uses the sg2525a and right next to it is one label"6n137" its an 8 pin ic.
  Reply With Quote
Old 2nd December 2012, 09:25 PM   #28
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The outputs on the 3525 are pins 11 and 14.

I don't know whey they're using the opto-coupler.
  Reply With Quote
Old 3rd December 2012, 02:14 AM   #29
diyAudio Member
 
jeanious2011's Avatar
 
Join Date: Nov 2010
Location: Texas
Sorry it took me long, but here are the wave forms i got. Both pins 11 & 14 looked identical.

My scope was set at 2v/div & 20us time/div.

Pin 11
Click the image to open in full size.

Pin 14
Click the image to open in full size.


Let me know what else to check for.
  Reply With Quote
Old 3rd December 2012, 05:21 AM   #30
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
They look OK but in the future, leave your scope set to DC coupling. Read the 'best initial setting' section of page 73 of the web site.
  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
Blown parallel FETs? Yooper Power Supplies 3 21st October 2012 12:06 AM
Autotek Super Sport At2000.1 blown psu fets substitude ivkata Car Audio 2 17th April 2012 03:26 PM
Rockford Fosgate 60ix FETs blown LazySteve Car Audio 12 23rd June 2011 08:48 AM
Brax, Helix Schematic senee Car Audio 2 1st February 2008 05:42 PM
Brax amplifier help (no output) MCD007 Car Audio 10 10th January 2008 08:33 PM


New To Site? Need Help?

All times are GMT. The time now is 12:26 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