Question about Mackie ProFX8 / TH-15A PA Package

2 Answers

TH-15A won't make sound. Comes on, then flashing front light

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I've fixed over 100 of these beasts, hope i can shed light for you all ;-)

The flashing LED indicates the power supply rails (+28v and -28v) are being pulled down to 0volts by a (typical) fault on the amp board, usually means the amplifier chip has faulted (usually the LF amp, but on occasion can also be the HF amp).

Locate the 3wire(red, black, brown) connector that goes between the amp board and the larger power-supply board and disconnect it at the power-supply end. (it's actually hard-wired on the amp board end).

Now switch on the Amp, the LED should now be stable, which has proven you've isolated the fault.

Order a replacement board from Mackie, the part number is on the PCB.
From memory it's something like "002163-00" or something, but now you know what the part number will look like.

Depending what country you're in, Amp boards are around $100.


Posted on Nov 09, 2011

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mackie Master
  • 5,603 Answers

This probably means there is a failure and the internal protection circuits have activated. It will probably have to go to a shop for repair.

Posted on Jan 03, 2011

  • paulbkaraoke May 15, 2011

    I had that problem . I got the schematics and started checking volatges etc. After taking the sections apart, and reconnecting all, and resoldering connections between boards, the speaker worked again for several hours. sad to say that when i brought it to a gig, it just flached the LED again, no power. I will take it apart again. I won't be defeated



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

No power in Mackie TH-15A

i) I assume the fuse you mentioned was in the mains plug - did you also check the fuse in the TH15A mains input socket? This is accessed by pulling out the tab in the bottom section of the socket (below the centre pin). This is a 3.15Amp antisurge fuse, 20mm type.

ii) If this fuse has blown, then replace it & all may be well ...... but if it blows again, then move to step iii).

iii) With mains disconnected, remove rear panel (outer screws) & check the power supply PCB for damaged components, especially R111 & R112 (100ohms). If the latter are burnt or open circuited, then the amplifier module may have blown.

regards, Dave

Aug 20, 2014 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

How to replacea bass driver in mackie thump 15a

"How to replace bass driver in mackie thump 15a".
Did you mean,disassembly the speaker enclosure?
Just remove the 16 screws at the rear cabinet, using a screwdriver.
Then remove the 4 screws that secure the speaker, using the hex key. Is the bass driver blown up / broke?

Jan 28, 2014 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

No sound out of my mack th-15a

As Tom Jones sang 'It's not unusual....' The amp has probably gone and you need to get it fixed. These are not the most reliable and I would suggest getting something better from another manufacturer if you can afford it, perhaps a local shop would do you a trade in if they can fix it?

Nov 11, 2013 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Mackie Thump TH-15A speaker amplifier module

Jose Miguel Carcamo Cruces do you have pictures of these j112 fet ? Thank you!

Oct 07, 2013 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

My Mackie Thump TH-15A will not produce any bass. I can get some sound but only from the top tweeter. Whats wrong and how can i fix this?

Could be the crossover has died or the main speaker winding has failed. Open her up and connect on side of the main speaker direct to a 9v battery and then wipe the other wire over the other terminal. If you get a crackling from the speaker then it's likely the crossover, if there is no response at all from the speaker then it is dead and possibly the crossover too.

Sep 23, 2013 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Th-15 power light comes on and goes off but there is no sound

short circuit in secundary of the power supply or power amps damaged.

Jan 07, 2012 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

I have 2 th-15a and went i put them to sound together trere is a big humming sound. i dont have a mixer and if i need one witch one should be

Make sure ALL interconnected equipment is powered from the SAME receptacle. Use extension cord if necessaary. Use ONLY balanced interconnecting audio lines as well. You have a ground loop... make sure all power connections are three wire.

Jun 23, 2011 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Just wondering if I plugged into the thru side instead of the in side will there be a differance in clareity

There shouldnt be an issue, you can try it if it sounds like **** then go back to the other way. Trial an error is always an option :-)

May 20, 2011 | Mackie TH-15A Active DJ Powered THUMP...

1 Answer

Blown amp in the TH-15A . Is there a replacement amp assembly I can buy and how much

Yes, the amp section can be replaced. It won't be cheap however. Your best bet is to contact Mackie directly. Do a web search for Mackie Parts and contact the service center. Thay will either take the order directly or refer you to a local supplier based upon your location. They have always been extremely helpful when I used them in the past.


Mar 13, 2011 | Mackie ProFX8 / TH-15A PA Package

3 Answers

Bought a used Mackie TH-15A. When powered up there is no all.

The internal amp is in need of repair. Are there any other symptoms or signs?

Feb 08, 2011 | Mackie TH-15A Active DJ Powered THUMP...

Not finding what you are looking for?
Mackie ProFX8 / TH-15A PA Package Logo

808 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mackie Music Experts

Michial Gueffroy

Level 3 Expert

1138 Answers

Matthew Spark
Matthew Spark

Level 3 Expert

1066 Answers

Vito Vacirca Jr.

Level 2 Expert

140 Answers

Are you a Mackie Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides