Originally Posted by Tim Farrant
We have repaired several of these speakers now. They are quite badly designed and even more badly built. The schematics we were given do not match what is on the pcb. It is most likely the power amp chip, or at least it needs to be eliminated by replacing it. It could also be a bad joint. The boards on the ones we have seen are covered in this black glue shit which makes it very hard to service. Good luck !
One monitor is a a Blue PCB, the other - the one in question is Green.
So I replaced the output device and the surrounding components that touch the Output trace that leads to the positive lead for the sub; two electro caps (one is non polar) and two other np caps. The monitor worked fine for a bit then I got a loud pop and it seemed the tweeter blew - or thought it did.
I removed the front plate, seems the negative lead for the tweeter may have been loose. Put it back together and then it worked fine. Then later after turning it off and then coming back to play again, the monitor wouldn't produce sound.
Would a faulty connection with the power cause this? Would a faulty power connection cause the fuse to blow? - cause the fuse isn't blowing, the monitor stays on. But I had the back of the amp off and had it connected, using my plastic poking stick to touch the PCB trace and components to see if anything was wrong.
The amp seemed to work again but I think - not totally sure, I touched the power cord with my foot and the amp went silent again. I tried replicating it but cannot.
Someone also mentioned checking the input rectifier, where might that be located in the amp?
Thanks to everyone for weighing in, I appreciate it.
Originally Posted by jeremycox
They dont sound that great either
For $50 and me being nearly broke, they'll do.