Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: vernimark on April 14, 2016, 10:21:58 AM

Title: not working CIRCUS EXIDY PCB
Post by: vernimark on April 14, 2016, 10:21:58 AM

I'm going crazy with a CIRCUS EXIDY board. Do you know if there are a troubleshooting guide, web site, repair log or what else about that kind of boards?

thank you!!!

Title: Re: not working CIRCUS EXIDY PCB
Post by: ricky2001 on April 14, 2016, 03:08:09 PM

I fixed a similar board some time ago, a Crash bootleg, I thing the board is much the same, this one only had a couple bad rams, I'll check my notes and tell you.

Ricky

Title: Re: not working CIRCUS EXIDY PCB
Post by: vernimark on April 15, 2016, 12:18:47 PM

I started from this point
I thought an easy fix because the game under the garbage worked

Title: Re: not working CIRCUS EXIDY PCB
Post by: vernimark on April 15, 2016, 12:19:29 PM

Replacing a couple of RAMs I could reach this result

Title: Re: not working CIRCUS EXIDY PCB
Post by: vernimark on April 15, 2016, 12:24:03 PM

I spent a couple of nights to check the V signals, RAMS, and video signal generation trying to understand why a vertical line was missing..... then I discovered this

 :shock:  :shock:  :shock:

Title: Re: not working CIRCUS EXIDY PCB
Post by: vernimark on April 15, 2016, 12:25:26 PM

now switching on the game I have this image.

Yes it is good, but now the game  freezes after less that one second.

and, in any case, the first H line is missing...

Title: Re: not working CIRCUS EXIDY PCB
Post by: Belike on April 16, 2016, 08:04:48 AM

Nice job, that short circuit is typical. ;)

Title: Re: not working CIRCUS EXIDY PCB
Post by: lesoleil70 on April 16, 2016, 06:11:08 PM

Quote from: vernimark on April 15, 2016, 12:24:03 PM

I spent a couple of nights to check the V signals, RAMS, and video signal generation trying to understand why a vertical line was missing..... then I discovered this

 :shock:  :shock:  :shock:

Is it my eyes or this picture? I'm sure there are more shorts to be seen here.

Title: Re: not working CIRCUS EXIDY PCB
Post by: vernimark on April 16, 2016, 11:40:57 PM

No more  :lol:
Anyway the game still freeze always likebin the last pic