Cinematronics world series baseball

kjallard

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Newbee needs Ideas.
PROBLEM: I get a loud humm from the speaker and lines across the top of the screen.
1.I have replaced all caps on gameboard,power supply and monitor
2.reseated all chips I/C's
3.looked for any burn't bad spots on board.
4. Checked resistors for opens.
After I reseat the I/C's and fire the game up everything works good then after about 30+ seconds sparkles appear on the top of the screen and crackles in the sound then the humm sound happens and the lines appear and stay.This has happened twice
ANY IDEAS??? I'm stumped---probably 15 cent part kicking me in seat--See pics below--All help will be appreciated--Thanks------Kev

 
Looks like you've certainly covered all the basics and then some here. Hmm. . .

Is the monitor chassis grounded correctly? Speaker grounded correctly? Check all the grounds - boardset, PS, monitor, etc. to make sure they test good for continuity.
 
Looks like you've certainly covered all the basics and then some here. Hmm. . .

Is the monitor chassis grounded correctly? Speaker grounded correctly? Check all the grounds - boardset, PS, monitor, etc. to make sure they test good for continuity.

Just tested grounds--- .1 to .3 ohms--don't look rusted/bad--tested with meter neg lead connected to power supply plug ground. I have tried to rattle/wiggle parts on the board to maybe find a bad connection/terminal or electronic part---nothing happened/changed.
next Idea???? I'm open to try anything except explosives/throwing it in bonfire--Kev
 
Hmm. . . with that pic, that I couldn't see before, looks more like a boardset issue than a monitor issue.

RAM perhaps?
 
Hmm. . . with that pic, that I couldn't see before, looks more like a boardset issue than a monitor issue.

RAM perhaps?

I don't know---if I shut off the game for a while and turn it back on the same thing happens--no humm and clear picture then it starts to fail---perhaps bad transitor?--problem is I don't have a lot of spare parts to test on board yet---still open for any ideas--Kev
 
Well, I would guess it's something that is fine until it really starts to have to do its job once the charge builds up - a cap on the boardset itself maybe?
 
What about getting some of that freeze spray and hitting areas to see if you can find if it's an area getting hot?
 
What about getting some of that freeze spray and hitting areas to see if you can find if it's an area getting hot?

I thought it might be a bad cap on the board because the monitors caps were really bad--so I changed all the caps on the board.

Freeze spray? can a part get hot, so quick,(approx 30-40 seconds) to partially fail?---I would think it would take longer time to get hot and fail--but great Idea--I'll get some and try- maybe it just might work---Thanks, any other idea's ?---Kev
 
Just feel some chips. One of my cinametronics boards (super off road) the ram chips got hot enough to burn after about 20 seconds.
 
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