(Topic ID: 297893)

Crackly sound on warm up STTNG

By Incomer

2 years ago


Topic Heartbeat

Topic Stats

  • 12 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by moertsches
  • No one calls this topic a favorite

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#1 2 years ago

Hello everyone,

The sound on my STTNG is extremely crackly until the game warms up - then it is not too bad at all

Is that likely to be a capacitor issue, and if so is it the two big ones that should be changed (C20 and C21) or something else?
There seems to be a lot of capacitors on this board!

Many thanks for any help you can give
David

#2 2 years ago

The DCS sound board has the two big power filter caps and 4 1uf pass through caps.
The big caps are snap-caps and not easily removed without ripping through holes.
But yes...I'd start by replacing them.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#3 2 years ago
Quoted from ChrisHibler:

But yes...I'd start by replacing them.

Please keep in mind this is Chris saying he would replace them, he's not necessarily saying to do this as replacing one of these without damaging your board is right up there in skill level as removing your RAM IC intact.

#4 2 years ago

OK, thank you for your input - I take on board your comment about the difficulty of changing them and if I go ahead will proceed with extreme caution!

#5 2 years ago

It's likely to be the smaller electros.

Large ones rarely give the amount of problems they get blamed for. I would swap out the small ones before doing anything else.

#6 2 years ago

Sounds like you should just send that board to Chris. Get it done right once and be done. Then enjoy your game for years to come. Just Sayin

#7 2 years ago

whthrs166 - I'm in UK so that isn't really an option!

#8 2 years ago

Has anyone done 6.28.6.5 on here on a STTNG?, and if so what result did you get?:
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Scratchy_Audio_or_mumbled_speech

#9 2 years ago

Sure. I remove those caps from every DCS board that I repair.
I don't think those two ceramic caps are causing the issue that you note.
But go ahead and cut them off. It can't hurt and it might help.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#10 2 years ago

If you "wiggle" the two big caps, does it change the behavior?
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/Contact ... for board repairs
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#11 2 years ago

Thanks ChrisHibler

I tried wiggling the big caps but it had no effect (and there was no observable play with them when I did so)

I'll try cutting off the small caps

The sound quality starts really bad - a noticeable hum when the gam is first turned on, and really crackly sound when a game is started - but it improves very quickly so that after a few games it could pass as close to normal

Appreciate you taking the time to comment
David

1 month later
#12 2 years ago

Hello Incomer,

I had exactly the same problem. The crackly sound got better after a while. In cold condition it was very bad.
I exchanged the U20 (AD1851N) , digital to analog converter chip. I also changed the caps C20,C21,C15,C18,C19,C32, C41 (1µF63V) and C52 100µF but they are not the reason for the crackly sound I guess. I just wanted to renew everything.

After my change it is fine and running since 7 years now without a problem.

When changing the big caps, I had the problem that the small connection through the hole of the pcb was also coming out. be sure to have electrical contact on both sides of the pcb.

good luck!

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