Help monitor audio gxw-15 subwoofer

[exceptional]

Have a problem with one of my gxw-15 subwoofers. When pluging in power socket it shows power is ok (red LED), but when trying to turn it on it turns iff immediately (can hear relay clicking sound). Cause i have working second subwoofer i tried replacing several boards. So for now i can say power board is causing this problem. There are no visible damaged element on it. I wrote to Monitor audio and they sent me all schematics. What i have found is defective capacitor C535(short circuit), but after changing it ...same behavior.
Measured output FETs, diodes. Seems everything is fine...

[R_J]

Re: Help monitor audio gxw-15 subwoofer

If C535 was shorted, you may have an open R508 that supplies the AUX supply. Check your AUX voltage and also the VCC voltage

[exceptional]

Re: Help monitor audio gxw-15 subwoofer

R508 is ok.D507 too. Checked them. Will check aux voltage and VCC.

[dobrykamil]

Re: Help monitor audio gxw-15 subwoofer

What about that swollen cap next to D528? Think it's on the +5V rail which is also used by that black relay.

[exceptional]

Re: Help monitor audio gxw-15 subwoofer

Thanks guys! I really missed that capacitor near D528. It was damaged too. Changed it and everything started to work!

[GriffDeLaGriff]

I have the same subwoofer with the same behaviour. I should see if I have the same problem. Was it actually only that swollen cap?

[GriffDeLaGriff]

So mine shows the exact same behaviour. But cant see any fault on that or adjacent caps.

[dobrykamil]

I have now joined the club. Trying to fix back plate with clicking issue. In my case, 5VDS is present and has correct, +5V value, but once I manually turn sub on, it drops to +2-3V like something was drawing too much current for standby smps to handle with.Does anyone have service manual for this particular model?
Thanks in advance.