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Main => Monitor/Video Forum => Topic started by: rhorne on April 06, 2015, 11:55:15 am

Title: Neogeo MVS monitor sparking when plugged in
Post by: rhorne on April 06, 2015, 11:55:15 am: Hello guys. New to this forum and I'm hoping someone can help offer me some advice.

I've just bought a Neogeo MVS arcade machine. It appears to contain a 19" monitor and the sticker on the inside says Wells-Gardner Model No. 19K7689.

I know nothing about the history of this machine.

When I plug it in I hear a constant sparking and there's clicking out the back. The video below shows what happens.

There's a sparking between a transistor and the black box that contains two monitor control dials. Where do I even begin diagnosing the problem?

https://www.youtube.com/watch?v=LxEtwqLfOQs&feature=youtu.be (https://www.youtube.com/watch?v=LxEtwqLfOQs&feature=youtu.be)
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: yotsuya on April 06, 2015, 12:25:34 pm: Flyback is going. Based on this email, send it off to arcadecup.com for repairs. Do not try it on your own.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: rhorne on April 06, 2015, 01:08:56 pm: Not sure how feasible that is when I'm based in the UK. Bugger.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: yotsuya on April 06, 2015, 01:17:34 pm: Quote from: rhorne on April 06, 2015, 01:08:56 pm
Not sure how feasible that is when I'm based in the UK. Bugger.

Hmmm........... anyone know who does monitor chassis repair in the UK?

You COULD attempt it yourself, based on your level of comfort with electronics and soldering.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: Malenko on April 06, 2015, 01:29:14 pm: its not that expensive to ship a chassis, you dont have to send the whole monitor.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: rhorne on April 06, 2015, 02:11:30 pm: I'm reasonably comfortable with electronics and soldering and indeed I'd like to have a go at it myself, I'm just not even sure where to begin in terms of identifying the faulty component.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: pbj on April 06, 2015, 04:49:16 pm: This will end well.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: grantspain on April 06, 2015, 05:57:06 pm: i do chassis repairs in u.k
but tbh its only the flyback that needs replacing,pretty easy job as long as you can solder/desolder to a good level

HR7717 is the part you need-that is the hrdeimens replacment part that was commonly available in europe

a few places sell them still in u.k but if you get stuck i could sell you one from my stock

with the new hr7717 you need to move one electrolytic cap as it prevents the new flyback sitting correctly-you can either mount the cap on the solder side or replace it with a new cap with legs "dog leg"
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: rhorne on April 07, 2015, 11:40:16 am: Quote from: pbj on April 06, 2015, 04:49:16 pm
This will end well.

Well this is why I was trying to determine the complexity of such a repair. Thanks for the support.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: Malenko on April 07, 2015, 12:02:53 pm: I can vouch for grantspain , been here forever and knows his stuff.
Title: Re: Neogeo MVS monitor sparking when plugged in
Post by: lilshawn on April 14, 2015, 02:33:39 pm: I can vouch for PBJ, He's seen some sh...stuff.

High voltage ain't nothin' to f- with, it WILL mess you up in a bad way if you don't know what you are doing.

Replacing a flyback isn't really a big deal as long as you can solder good. as long as you observe safety precautions you will be fine. google up some youtube videos on "flyback replacement" and then decide if it's something you'd like to tackle.