Konami Xmen sound static

mike11

Active member
Joined
Mar 7, 2012
Messages
1,617
Reaction score
9
Location
Pennsylvania
I have an xman here that had terrible sound static, sounds like the speakers are completely blown and ripped which is not the case, both speakers are ok and was tested with another speaker as well and the condition didnt change.....after that I moved onto the electrolytics on the board and the 358 amp... changed all them and its still the same......... whats next ??

thanks
 
I had a cabinet that was making all kinds of static and feedback through the speakers. Turns out the grounding braid was making a bad connection with my monitor frame.
 
thats a possibility cause this has a switcher wired in not the big one in the back.......ill go over all the grounds and see where i end up
 
its on the bench with the same issue, diff speaker no change, ground is not a prob, all electros around sound section changed..... even went as far as to dig out the caps on the custom sound chip and change them too its still distorted
 
If you changed the capacitors and they're still static, sometimes it could be underneath the chip where either:

A) leaked electrolyte caused damage to the traces underneath, or

B) the original capacitors were on for a long time, leaked, and over time caused their ability to filter voltage to fade and therefore causing damage to the op-amp or DAC underneath the chip.


You're next step, in my opinion, should be to remove the hybrid sound chip from the PCB, clean it well, reflow solder **carefully** to all 64 pins, then use chip quik to remove the op-amp (LM358 replacement part), and check continuity of the traces between the op-amp and corresponding pins; repair traces by jumping with 30 awg kynar wire if needed.


Last but not least, if there's still static after all that, you may need to replace the DAC (AD1868 replacement part only available through AliBaba/AliExpress).


I'm going away to Greece tomorrow and won't return until July 30th, so when I get back and if you're interested and don't want to attempt to repair the sound chip, you could send me the board for repair.

If you're comfortable removing the sound chip though, definitely pick up some extra chip quik (leaded only, don't bother with the lead-free as it's much tougher for this job). And make sure you have a desoldering gun like a Hakko 808 or so - both tools will help make the removal easy.
 
i would lean toward damage from caps out of range cause i saw no evidence of leakage... i have a pace station here desolder is no prob im always stealing chips off stuff ...lol
 
i would lean toward damage from caps out of range cause i saw no evidence of leakage... i have a pace station here desolder is no prob im always stealing chips off stuff ...lol

Lol awesome, definitely get started! If the hybrid sound chip (HSC) was perfectly shiny and clean, then I would suspect that the caps weren't leaking. However if it were a little dirty or cloudy, then the caps were definitely leaking over the HSC.

One way you're gonna know, when removing the original caps - when the iron touches the HSC, you're gonna smell a horrible stink - THAT, right there is the leakage.


Caius is on the ball with this. Definitely get yourself a new LM358 op-amp and AD1868 DAC (again, from Alibaba or Aliexpress) ASAP so you have it on hand when you replace everything - also some 30 awg kynar wire when you can. Can get a nice roll off ebay for pretty cheap and shipped quick

Take your time removing the HSC and also pick up chip quik just in case. I love using it on the op-amp and DAC, they come off in no time.
 
Back
Top Bottom