John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum

Tech and Marketplace => I need help with my game! - Technical Discussion => Topic started by: johnrt on January 09, 2018, 11:58:21 am



Title: DK video issue.
Post by: johnrt on January 09, 2018, 11:58:21 am
Hi! I have an issue with one of my DK boards. This video shows the issue. It's 100% sure it's on the video PCB and it's not a ROM or PROM issue (I've swapped boards and ROMs to make sure). So has anyone seen this before, and can guide me in the right direction?

https://www.youtube.com/watch?v=pqZ_otZzdAU


Title: Re: DK video issue.
Post by: johnrt on January 10, 2018, 04:45:10 pm
Using a logic probe I found that one of the outputs on the LS283 at 7R was stuck high. Changing this IC fixed this issue!  :D