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

XX-Goliath 5kW issues
XX-Goliath 5kW issues
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 6th August 2019, 05:05 AM   #11
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Do you possibly have an inductor shorted to a trace on the board?

You stated that you had no solder bridges so that aren't many possibilities that can light up the lamp.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 6th August 2019, 09:46 PM   #12
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
Quote:
Originally Posted by Perry Babin View Post
Do you possibly have an inductor shorted to a trace on the board?

You stated that you had no solder bridges so that aren't many possibilities that can light up the lamp.
Small solder bridge found and fixed but problem persists, I think.

Click the image to open in full size.

I've removed all 4 main torroid inductors as well is the 2 iron core inductors. All look perfect no bare areas on the board under them.

Click the image to open in full size.

Obviously with the inductors removed there is no DC being sent to the speaker leads to then send the amp into protect. However I am still getting a -142 vdc on the inputs of all 4 main inductors. (Refrenced to both terminal ground and speaker ground.) That cant be right.

I can see where someone attempted a repair on the rectifiers....and there is 1 non oem rectifier in place. However all 4 have the same exact output, one leg 125v, one leg -125, and middle leg has the switching drive being fed to it.

What are your thoughts at this point?

Last edited by BumpinYota; 6th August 2019 at 09:49 PM.
  Reply With Quote
Old 6th August 2019, 10:58 PM   #13
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
In the picture above with the removed inductors, on the bottom left 3 spots for the output mosfets....ALL legs have rail voltage.
  Reply With Quote
Old 6th August 2019, 11:18 PM   #14
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Measure the resistance across the pads for the individual the individual transistors for that group. Do you see any difference between the 3 transistors?

Measure Leg 1-2, 1-3 and 2-3.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 8th August 2019, 01:26 AM   #15
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
Ok Leg 1-2 starts at about 12,000 ohms and starts climbing. After about 3 minutes of waiting, it is at 32,000 and continuing to climb very very slowly. Leg 2-3 starts at about 33,000 and starts climbing after about 2 minutes it is at 60,000 and climibing more slowly.

1-3 is a stable 33,300 ohms right off of the bat.
  Reply With Quote
Old 8th August 2019, 03:23 AM   #16
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
None of that is a direct short or even anything that could light up a light bulb. Do you think that you may have had a more serious problem or that this one has changed to something than the direct short that you had earlier?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 8th August 2019, 04:51 PM   #17
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
Problem still persists. Could the incorrect rectifiers being used generate this issue?
  Reply With Quote
Old 8th August 2019, 05:21 PM   #18
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Install a jumper wire in the place of the inductor for the conductive group of outputs and see if it will still light the lamp.

Or connect the lamp to whatever ground you were using and touch the other terminal of it to the transistor side of the inductor.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 8th August 2019, 06:03 PM   #19
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
EDIT: I just now saw your post and will do so just to make sure the problem is alleviated.

Ok between troubleshooting my car's AC and taking my son to therapy, I pulled the audio driver board just to see what happens. Problem resolved. I am quite confused how voltage was getting to the drain pad of all 4 internap amps but it appears *knock on wood* to be gone.

Now comes troubleshooting the audio card time....lol

Last edited by BumpinYota; 8th August 2019 at 06:06 PM.
  Reply With Quote
Old 8th August 2019, 06:34 PM   #20
BumpinYota is offline BumpinYota  United States
diyAudio Member
 
Join Date: Jul 2019
Location: Venice, FL
Yes zero voltage on the drain pad of the fets with the audio card removed. Double checked with incandescent bulb and indeed no DC found.

But how would the driver card send rail voltage to the gate pads and the drain pads though? I am quite confused there....
  Reply With Quote

Reply


XX-Goliath 5kW issuesHide 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
G.A.S Goliath Cambe Analog Line Level 27 19th August 2016 01:02 PM
hifonics goliath luigidedom Car Audio 1 24th September 2014 02:50 PM
Hifonics goliath mike49504 Car Audio 14 10th March 2010 05:26 AM
David and Goliath Bgt Class D 7 1st October 2005 09:02 PM
Amplifier Goliath! viktor1986 Solid State 11 27th June 2005 10:15 PM


New To Site? Need Help?

All times are GMT. The time now is 12:51 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki