MS-2930 black screen

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AstroSega
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MS-2930 black screen

Post by AstroSega »

Hello,

I have no static but neck glow on my Blast City, could you help me?
Someone has the service manual?
Thanks
AstroSega
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Posts: 13
Joined: April 3rd, 2016, 9:29 am
Location: Budapest

Re: MS-2930 black screen

Post by AstroSega »

Any ideas?
AstroSega
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Posts: 13
Joined: April 3rd, 2016, 9:29 am
Location: Budapest

Re: MS-2930 black screen

Post by AstroSega »

An update:
After reflow soldering, i had picture on 15khz but bad, i could see retrace lines and poor colors, but nothing on 31 khz.
I decided to clean the "black goop of death", so i take off the flyback and resolder it, no change... This morning i switch on the blast and no picture even on 15khz, i only see retrace lines.
Someone can help me?
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grantspain
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Re: MS-2930 black screen

Post by grantspain »

did you check the solder on the crt socket, ms2930 are well known for getting bad solder joints on the socket
nikolash
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Re: MS-2930 black screen

Post by nikolash »

I have this chassis now, Crt socket was already reflowed, when I turn on and I have a big sparkle on the primary, if I put off fuse f701, I don't have sparkle.
Strange thing, i don't see retrace lines like Astrosega.
nikolash
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Re: MS-2930 black screen

Post by nikolash »

Some update : I heard big sparkles on the screen, exactly like that:
https://forum.arcadeotaku.com/viewtopic.php?t=35051
I think i will give up, i don't want to kill my tube, i will send back the chassis to Astrosega if nobody has tips about it. Do you know where i can find the service manual?
nikolash
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Re: MS-2930 black screen

Post by nikolash »

Update of the day, after cleaning all the black glue, i have finally a picture!
With 15khz pcb / 15khz on the remote : screen is clearer on top so i can see retrace lines, when i reverse horizontal from the yoke, i reverse also the issue.
With 15khz pcb / 15khz on the remote : picture with normal sync issue
With 31khz pcb / 15khz on the remote : picture with normal sync issue
With 31khz pcb / 31khz on the remote : Black screen, i can see retrace lines if i increase bright pots but when i switch off power supply, i can see picture few millisecond!
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grantspain
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Re: MS-2930 black screen

Post by grantspain »

photo of the issue would be helpful
nikolash
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Re: MS-2930 black screen

Post by nikolash »

Problem solved, i found a bad smd capacitor.
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