(Topic ID: 271547)

Gottlieb System 1 Display Causing Chip Damage?


By Genieye

18 days ago



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  • 12 posts
  • 5 Pinsiders participating
  • Latest reply 10 days ago by gdonovan
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IMG_9113 (1) (resized).JPG
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#1 18 days ago

My Genie started having display issues as they all of a sudden went Bat S$%T then out like a light. I sent the CPU back to Ni-Wumpf who informed me that:

The chip at location Z6 was damaged indicating that there may be a problem with one of the displays for player 3 or 4.

These are original displays and have always worked fine. I guess I could get LED's at a huge cost but am wondering if there is anything to check first. The last thing I need is to get the board back and have it happen again. Any thoughts or advice would be appreciated. Thanks

#2 18 days ago

Not sure where location Z6 is, but U16 is an output to the displays. Maybe the same?
One thing that will damage chips on the CPU is disconnecting displays while the unit is powered up. Perhaps there is a loose connection between one of the displays and the CPU, and during game play the connection was lost and therefore ruined the chip. I would check the connectors/connections between CPU and displays. If they are original, they should be replaced.

Another thing before you go buy new displays....if you are not using player 3 and 4, then just disconnect them. You can play without them connected, you just cannot connect or disconnect them with power on.

There is also some good info on display issues here:
http://www.pinrepair.com/sys1/

#3 18 days ago
Quoted from JethroP:

Not sure where location Z6 is, but U16 is an output to the displays. Maybe the same?
One thing that will damage chips on the CPU is disconnecting displays while the unit is powered up. Perhaps there is a loose connection between one of the displays and the CPU, and during game play the connection was lost and therefore ruined the chip. I would check the connectors/connections between CPU and displays. If they are original, they should be replaced.
Another thing before you go buy new displays....if you are not using player 3 and 4, then just disconnect them. You can play without them connected, you just cannot connect or disconnect them with power on.
There is also some good info on display issues here:
http://www.pinrepair.com/sys1/

Thanks so much! Great advice and will definitely check everything out. I have never disconnected anything with the power on. I think to be safe I will not use those displays until I can make sure all the connections are good. They look great however. Can a bad display cause the problem? The 4th one got very bright as you can see in the photo. The game looked like this until all the displays went dark. Thanks

IMG_9113 (1) (resized).JPG
#4 18 days ago
Quoted from Genieye:

I have never disconnected anything with the power on. I think to be safe I will not use those displays until I can make sure all the connections are good.

Maybe a flaky connector lost contact? Have you go through and repinned anything, or are all the original connector pins still in there?

#5 18 days ago
Quoted from ForceFlow:

Maybe a flaky connector lost contact? Have you go through and repinned anything, or are all the original connector pins still in there?

Have not repinned those connectors but have others. Will do as you recommended and Ni-Wumpf too to try to isolate which display is bad then look for the reason. I think the previous owner repinned them as they look that way but not sure. I really appreciate your help and will report my findings here as soon as I know.

1 week later
#6 11 days ago
Quoted from Genieye:

My Genie started having display issues as they all of a sudden went Bat S$%T then out like a light. I sent the CPU back to Ni-Wumpf who informed me that:
The chip at location Z6 was damaged indicating that there may be a problem with one of the displays for player 3 or 4.
These are original displays and have always worked fine. I guess I could get LED's at a huge cost but am wondering if there is anything to check first. The last thing I need is to get the board back and have it happen again. Any thoughts or advice would be appreciated. Thanks

I am still trying to figure out what is frying the CPU but also the 1/4 SB fuse. Unfortunately I received the repaired CPU back and as recommended begin to reconnect each display one by one. Immediately all the displays looked bad after plugging it in, some very bright, others dim with segments doing crazy things, even the ball and free game display was a mess. As I disconnected one display at a time the others would change to some other crazy different looking display.

In other words something fried chip Z6 again and now started blowing the fuse. Here is a photo of the game even after the CPU was repaired and crapped out again. What are the chances the 13 year old Rottendog PS is doing it and not the displays? Thanks

IMG_9113 (1) (resized).JPG
#7 11 days ago

Surely you did not reconnect displays one by one with power on?

Do you have an original Gottlieb main board or a Ni-wumph or Pascal remake?

#8 11 days ago
Quoted from Genieye:

What are the chances the 13 year old Rottendog PS is doing it and not the displays? Thanks[quoted image]

Doubtful and easy enough to check voltages.

#9 11 days ago
Quoted from Tuukka:

Surely you did not reconnect displays one by one with power on?
Do you have an original Gottlieb main board or a Ni-wumph or Pascal remake?

I never would do that with the power on and have Ni-Wumpf's replacement boards. The Rottendog PS is 12 years old. The game was great then out nowhere the 4th display got real bright and the others had missing digits and flashing while it was playing. If you disconnect one or two of the displays the others change their weird displays from. For example, with all 4 plugged in you number 1 would show the total score after each ball even though it was garbled during play while the others were like I said above, bright dim flashing. You disconnect one or more and number 1 no longer is right and the ball and credit display get messed up.

To top it off the 1/4 SB started to blow as well from time to time and everything would go dark. Again, this all came out of nowhere with the game in play. Ni-Wumpf repaired the board and the game still did the same thing to the point where I could not tell if the chip fried again or if it was something else. Ni-Wumpf said it could be the PS possibly. The last thing I need is to throw darts and money at a new PS, digital displays, and continued repair of the CPU only to not fix the real issue. I know I need to spend to fix it but am hoping to have a good place to start first with some help here so I don't buy expensive things I do not need. I really appreciate the help here. Thanks

#10 11 days ago
Quoted from gdonovan:

Doubtful and easy enough to check voltages.

Can you point me in a direction on to what to look for to determine voltage wise whether its the PS?

#11 11 days ago
Quoted from Genieye:

Can you point me in a direction on to what to look for to determine voltage wise whether its the PS?

Aren't the test points/pads clearly marked on the rottendog power supply?

Use your multimeter to read the voltages at those test points. If there's some that's off more than 5%, that could possibly be a problem.

#12 10 days ago
Quoted from Genieye:

Can you point me in a direction on to what to look for to determine voltage wise whether its the PS?

Pinwiki is your friend and voltages should be indicated on the power supply board.

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