Monitor maybe damaged in shipping? Help would be appreciated

raiguy5000

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Hey there folks, I'm fairly new to cabinets, but I picked up a Neo Geo recently with what I believe is a 19" K7000 monitor in it and I can't get it to power on without blowing the fuse on the monitor board.

I tested the monitor before picking it up and it didn't seem to have any issues I drove it a few hours home and plugged it in and it blew a fuse. I can't see any obvious issues that would cause a short, but I'm not overly experienced so any help or insight would be appreciated. It could very well be something obvious I'm overlooking. Hopefully these pictures are decent.
 

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Follow up question that may also be a dumb one. This fuse link has continuity with itself without a fuse which I thought was typically bad, but it only has continuity when the isolation transformer is connected. No power running through just connected. Seems strange to me, but I'm not sure.110.jpg
 
Hey there. I think I saw you posted in Reddit too, right? I thought there you said it was a fuse near the iso transformer, but here you said the fuse on the monitor chassis board is blowing. Can you clarify?

I'll let other experts here chime in, but that chassis board looks a bit weird to me. I don't see any of the green masking on the top like most every other one I've seen.

Here is a 19" K7000 from my bench. Note the green masking. Maybe yours is an unusual revision or something. It's also been capped, I can see that (and I can see the sticker that comes with the APAR cap kits in one of your shots.

IMG_2938.jpeg

Re: the fuse… you didn't power it up without the iso being in line, did you? That will make bad things happen in most cases.

I would start with Randy Fromm's troubleshooting flow chart which I see a copy was posted in this thread:
Post in thread 'K7000 Makes Weird Noise And Then Pops Fuse'
https://forums.arcade-museum.com/th...-noise-and-then-pops-fuse.429724/post-3815868

Follow that chart and see where it gets you.

If it's another fuse other than the one on the monitor chassis board itself, then we probably need more description or photos of what fuse it is.
 
Hey there. I think I saw you posted in Reddit too, right? I thought there you said it was a fuse near the iso transformer, but here you said the fuse on the monitor chassis board is blowing. Can you clarify?

I'll let other experts here chime in, but that chassis board looks a bit weird to me. I don't see any of the green masking on the top like most every other one I've seen.

Here is a 19" K7000 from my bench. Note the green masking. Maybe yours is an unusual revision or something. It's also been capped, I can see that (and I can see the sticker that comes with the APAR cap kits in one of your shots.

View attachment 842766

Re: the fuse… you didn't power it up without the iso being in line, did you? That will make bad things happen in most cases.

I would start with Randy Fromm's troubleshooting flow chart which I see a copy was posted in this thread:
Post in thread 'K7000 Makes Weird Noise And Then Pops Fuse'
https://forums.arcade-museum.com/th...-noise-and-then-pops-fuse.429724/post-3815868

Follow that chart and see where it gets you.

If it's another fuse other than the one on the monitor chassis board itself, then we probably need more description or photos of what fuse it is.
it's the last model K7900, they were cream colored.

there's also way too much text to process here.

@raiguy5000 did you buy this in working condition or was it a project monitor?
 
Hey there. I think I saw you posted in Reddit too, right? I thought there you said it was a fuse near the iso transformer, but here you said the fuse on the monitor chassis board is blowing. Can you clarify?

I'll let other experts here chime in, but that chassis board looks a bit weird to me. I don't see any of the green masking on the top like most every other one I've seen.

Here is a 19" K7000 from my bench. Note the green masking. Maybe yours is an unusual revision or something. It's also been capped, I can see that (and I can see the sticker that comes with the APAR cap kits in one of your shots.

View attachment 842766

Re: the fuse… you didn't power it up without the iso being in line, did you? That will make bad things happen in most cases.

I would start with Randy Fromm's troubleshooting flow chart which I see a copy was posted in this thread:
Post in thread 'K7000 Makes Weird Noise And Then Pops Fuse'
https://forums.arcade-museum.com/th...-noise-and-then-pops-fuse.429724/post-3815868

Follow that chart and see where it gets you.

If it's another fuse other than the one on the monitor chassis board itself, then we probably need more description or photos of what fuse it is.
Its the monitor on the chassis board that is blowing. The iso fuse blow first, but I cleaned around the cabinet a bit and its no longer blowing and the marquee seems to be getting power without issue. So its just the monitor board now, I've never attempted to run it without connecting the transformer no.
 
it's the last model K7900, they were cream colored.

there's also way too much text to process here.

@raiguy5000 did you buy this in working condition or was it a project monitor?
It was in working condition when I picked it up a few days ago. After plugging it in once I got it home it started blowing the fuse.
 
Unless you pulled this back for a picture, this is a problem:


1756413136446.png
Neckboard is half off.

Power/fuse issues really should have the power section proven out. Mikes amateur monitor repair has a ton of videos on YouTube on this subject.
 
Unless you pulled this back for a picture, this is a problem:


View attachment 842926
Neckboard is half off.

Power/fuse issues really should have the power section proven out. Mikes amateur monitor repair has a ton of videos on YouTube on this subject.
It was fully seated last time I attempted a fuse. Its just loose in this picture as I had just taken it off
 
blown fuse: test HOT, C38, C36/69 (if 4 leg C36 you test legs kitty corner, not one side to the other)

otherwise it was plugged in without an isolation transformer and you have shorted bridge rectifier diodes.

I think that's all the ones I've seen
 
Unless you pulled this back for a picture, this is a problem:


View attachment 842926
Neckboard is half off.

Power/fuse issues really should have the power section proven out. Mikes amateur monitor repair has a ton of videos on YouTube on this subject.
Beat me to it! I was going to suggest it as well.

That said, where are you located? Perhaps someone here is close to you and can assist.

Del
 
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