Hi @Lex and everybody!

My cousin's Gigaworks S750 stopped working ( he had them repaired once already ) yesterday and he brought them to me to see if I can get it fixed.

I checked the capacitors on the input filtering side of the SMPS ( PSU ), they're Rubycon and they seem to be in perfect condition.

I started troubleshooting it and found out a "blown" capacitor, at position C62, the electrolytic capacitor that was covered inside a black insulation.

After I replaced it with a new Rubycon with similar specs ( same voltage, just a little bit higher capacitance ) the green power light started to light up, but not steadily.
It is blinking.
Whenever I hook up any of the two "amplification boards" to any of the two "outputs to amplifier boards" from the PSU PCB, the light starts to blink and I hear a clicking sound repeating endlessly.

If I disconnect the amplifier boards from the PSU and only connect the PSU with the main circuit board the green power light stays on and doesn't blink.

Any ideas what could be causing this ?

I'm uploading a video on youtube so you can hear the repeating clicking noise that I get once I connect the amplifier board/s to the PSU PCB's connectors.

https://www.youtube.com/watch?v=q_BAwNEEhOE



This post has been edited by electrified: Jan 28 2015, 02:40 AM

The clicking noise seems to be originating ( used a digital decibel-o-meter to pinpoint the source ) was coming from the transformer ( T3 ).
After some modifications things went south due to my lazy and totally confined and out of order workspace, and I happened to turn on the unit with a screw somewhere between the transformer's input and the surrounding mosfets and... kaboom!
Sparks and fire!

I'm giving up on repairing the POS design PSU.
I'll make a custom PSU to drive the amps myself as I have most of the stuff I need here, so long Creative's cheap-ass SMPS.