Williams Joust strange problem help !!

HPR pinball

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Hi klovers !
Here's the problem,
When powered on it run test, i have normal rug patern and message "all system go" but the second the attract mode start i lost the picture, no message on rom board.

Thanks for your help !!
 
Hi klovers !
Here's the problem,
When powered on it run test, i have normal rug patern and message "all system go" but the second the attract mode start i lost the picture, no message on rom board.

Thanks for your help !!
I'm having the same thing was there any solution. My board says 0 then c right after attract mode starts
 
the 4049 chip at 2A. it's connected to the PA peripheral bus of the 6821 PIA. 4049 is a CMOS part, they're very sensitive to static or overdriven voltage. PA controls the coin door switches. I don't know if the black screen is cause it's shorting slam tilt closed or not. sounds like a future science experiment.

EDIT: old KLOV threads talk about triggering the slam tilt and causing the game to reset. I tried it in MAME, it registers in switch test but otherwise does nothing in the game. nevertheless, a bad 4049 can cause the black screen of death.
 
the 4049 chip at 2A. it's connected to the PA peripheral bus of the 6821 PIA. 4049 is a CMOS part, they're very sensitive to static or overdriven voltage. PA controls the coin door switches. I don't know if the black screen is cause it's shorting slam tilt closed or not. sounds like a future science experiment.

EDIT: old KLOV threads talk about triggering the slam tilt and causing the game to reset. I tried it in MAME, it registers in switch test but otherwise does nothing in the game. nevertheless, a bad 4049 can cause the black screen of death.
Thanks a lot for the suggestion, i will replace this chip and see what happen.

I also have 0 on the rom board and when the black screen appear the "C"
 
Thanks a lot for the suggestion, i will replace this chip and see what happen.

I also have 0 on the rom board and when the black screen appear the "C"
yes the 0 only means it passed the POST. that's why you'll get INITIAL TESTS INDICATE ALL SYSTEMS GO before it goes black.
 
I made some test on roms board and i find ok by then, for some reason i was wrong.

I know today the roms boards is bad.
Today i test the roms chips with two set and it is ok.

I swap the special chip and the are ok.

There's few components and will check with my friend electronic frindly or find and another roms board and get rid of this !
 
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