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Author Topic: G07 black screen with neck glow  (Read 1007 times)

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1supercomputertyler

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G07 black screen with neck glow
« on: December 28, 2017, 02:27:38 pm »
I bought a twin Kobeís with a go7 that wouldnít turn on, after replacing the power supply I got it to work but the top of the screen was curling so I did a cap kit and the sync mod that the instructions for the cap kit told me to do. Now I am getting a black screen, I hear it turning on and I see neck glow but nothing comes on the screen, it doesnt even seem like the screen is lighting up at all. The b+ voltege ranges between 119.8 and 120.1 now that I adjusted it. Any advice on how to fix it?

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #1 on: December 28, 2017, 10:04:42 pm »
Iím wondering if the vhold could be causing this because this is what the previous owner did, the adjustment pot is broken and I think might be causing the issue. Does anyone know where to get a replacement

behrmr

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Re: G07 black screen with neck glow
« Reply #2 on: December 29, 2017, 01:39:39 pm »
Arcadepartsandrepair.com has a G07 chassis pot kit

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #3 on: January 07, 2018, 12:21:11 am »
I replaced the four pots but still had the same problem but then I discovered that the fly backs screen setting was set wrong and then I started getting a picture but I canít seem to get the picture to hold on the screen. After more than an hour of adjusting this is the best I could get it to look. Iím pretty sure all the pots are in the right spots but I just canít get a solid pic. Itís going to the right and down

grantspain

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Re: G07 black screen with neck glow
« Reply #4 on: January 07, 2018, 05:25:43 pm »
using wrong polarity sync connector

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #5 on: January 13, 2018, 01:11:16 pm »
How would I fix that, the sync cable is only one wire that goes to the two connectors on the board

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #6 on: January 14, 2018, 04:23:11 pm »
I tried reversing the sync mod and checking the sync cable for continuity, I got continuity but even after reversing sync mod I still got the problem

Ken Layton

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Re: G07 black screen with neck glow
« Reply #7 on: January 14, 2018, 05:13:01 pm »
Post pictures of how you have the sync wired.

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #8 on: January 14, 2018, 05:17:47 pm »
Post pictures of how you have the sync wired.
Here you go

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #9 on: January 14, 2018, 05:45:49 pm »
Acording to the twin cobra manual it uses negitive composite sync

Ken Layton

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Re: G07 black screen with neck glow
« Reply #10 on: January 14, 2018, 10:28:03 pm »
Impossible for me to see where you've plugged in the sync. Your picture is too dark.

Here is Bob Roberts' writeup on sync:

http://homearcade.org/BBBB/sync.html

Just scroll down to the Electrohome section.

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #11 on: January 14, 2018, 10:49:54 pm »
Here is a better photo, the sync cable only plugs in one way but from the link you sent me it appears that it should plug in with the wires on the other side, the previous owner broke the other spot for a wire on the connector so Iím not sure how I would fix this, but the game was holding a picture before the cap kit so I donít know how it could be this.
Impossible for me to see where you've plugged in the sync. Your picture is too dark.

Here is Bob Roberts' writeup on sync:

http://homearcade.org/BBBB/sync.html

Just scroll down to the Electrohome section.

Ken Layton

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Re: G07 black screen with neck glow
« Reply #12 on: January 14, 2018, 11:44:09 pm »
Your sync connector is plugged in wrong. You're going to need to scoot the connector over one pin to the left on that 3 pin connector.

1supercomputertyler

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Re: G07 black screen with neck glow
« Reply #13 on: January 15, 2018, 12:01:06 am »
It fixed it, thank you, you are the best, I canít believe it  was such a silly mistake
Your sync connector is plugged in wrong. You're going to need to scoot the connector over one pin to the left on that 3 pin connector.
« Last Edit: January 15, 2018, 12:03:44 am by 1supercomputertyler »

  
 

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