My JBL PRX 512M receives a signal but outputs no sound. What are the possible issues?

Could be either or both.
You will have to fault find to get an answer.

Question edited for clarity.

Undo the screws at the back and look for a cooling fan. There is something in the centre that looks like one. Or contact JBL direct and put in a warranty claim. The overheating issue seems well documented. Although you shouldn't have to, you could easily cut a vent hole with filter at the base and a 4" case fan above the amplifier to pull out the hot air. 3 x 500 watt inside is bound to create heat.

https://www.google.com/search?q=jbl+prx+625+overheating+problem

..

amp shutting down

Hello Carlos, from what I understand, these speakers are powered by Crown Class D amplifier circuits, I do not have the circuit of this JBL model
I can offer you the circuit of the PRX535, which I think must have its similarity, I pass the link to download it
I hope you can solve the problem
Greetings Franco Dosil

Hola Carlos, por lo que tengo entendido, estos bafles vienen potenciados con circuitos amplificadores de Crown Clase D, no tengo el circuito de este modelo de JBL
Te puedo ofrecer el circuito del PRX535, que considero debe tener su similitud, te paso el link para que lo descargues
Espero puedas resolver el problema
Saludos Franco Dosil

https://elektrotanya.com/jbl_prx535.rar/download.html http://www.jblproservice.com/pdf/PRX%20Series/PRX%20Series%20Amp%20Schematics.pdf

http://www.jblproservice.com/navigation/PRX-Series.html

This is the exploded view, what seems to be the issue??

I’m happy to assist further over the phone at https://www.6ya.com/expert/christopher_101fbc448ddafa3d

First check the speaker with a multimeter.

If it is OK, then check/repair the Class D amp that drives the speaker,

up to the input stage.


There are board part numbers printed on the PCB and some are

available on line.

Have a tech to guide you ,should you feel to Diy.

Pull the input plate off of the back, there are usually light bulbs in there that act as fuses

Make sure your audio interconnecting cables are XLR or TRS balanced lines. Use of TS cables similar to guitar cables with only two conductors (only the tip and the sleeve) reduce the gain 6 DB and contribute to hum and noise.

Power amplifier output stage failure.