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

JBL GTQ 400 - Power Supply Issue
JBL GTQ 400 - Power Supply Issue
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 August 2020, 01:58 PM   #1
roknkj is offline roknkj
diyAudio Member
 
Join Date: Apr 2018
Default JBL GTQ 400 - Power Supply Issue

Ok guys I have a JBL GTQ 400 with i believe a power supply issue. If i supply 12v from my power supply once the remote turn on is applied it drops voltage to 6v to 7v. Any ideas? The mosfet's seem not be shorted.
Attached Images
File Type: jpg IMG_2836.jpg (290.4 KB, 24 views)
File Type: jpg IMG_2837.jpg (353.3 KB, 24 views)
File Type: jpg IMG_2821.jpg (214.8 KB, 23 views)

Last edited by roknkj; 1st August 2020 at 02:12 PM.
  Reply With Quote
Old 1st August 2020, 02:01 PM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Repost the images using this method:

To upload photos click the following:

Go Advanced
Manage Attachments
Browse
Upload

Repeat as necessary

Preview post to see how the post will look.

Click Submit Reply to send it to the forum.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 1st August 2020, 02:13 PM   #3
roknkj is offline roknkj
diyAudio Member
 
Join Date: Apr 2018
Thanks
  Reply With Quote
Old 1st August 2020, 02:17 PM   #4
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If the excessive current draw only occurs after remote is applied, the problem is generally shorted output transistors but could be other problems like incorrect bias setting, bad/dirty bias pots, shorted rectifiers, shorted transformer...
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 1st August 2020, 02:38 PM   #5
roknkj is offline roknkj
diyAudio Member
 
Join Date: Apr 2018
Thanks I will defiantly start by checking some of those items first.
  Reply to this post

Reply


JBL GTQ 400 - Power Supply IssueHide 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
DD m4b power supply issue mnhiphop101 Car Audio 3 14th March 2020 03:27 PM
Krell KSP-7B power supply issue df_genius Power Supplies 4 18th January 2019 12:45 PM
Power supply issue shon35us Power Supplies 6 30th March 2008 07:00 PM
power supply issue classalpha Pass Labs 9 3rd June 2006 04:56 PM
help! power supply voltage issue jlg4104 Tubes / Valves 15 2nd December 2002 06:35 PM


New To Site? Need Help?

All times are GMT. The time now is 06:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki