TECH: Help With Jungle King PCB Set Needed

Anthony605

Well-known member
Joined
Nov 13, 2013
Messages
1,299
Reaction score
466
Location
HOWELL, New Jersey
Hi guys! I have a spare Jungle King PCB set that is almost 100% working. The only problem is there are lines across the screen. I attached two pics which show the problem. I am pretty sure that the issue is a RAM chip on the video board. I had a similar issue in the past and that was the cause of the problem. Anyone out there know what chip(s) I should replace? Thanks!!!
 

Attachments

  • king PCB.jpg
    king PCB.jpg
    192.2 KB · Views: 30
  • King PCB2.jpg
    King PCB2.jpg
    170.4 KB · Views: 32
Old thread, but, I'd add some info here. It's not the 2114s. Bad 93L422 RAMs cause this horizontal banding problem (both on video board) -- I can replicate this issue by removing one of the two. If you put the IC back in, and then remove the other, you will also get these bars, but, the pattern will be one slightly different, with the previously missing lines now filled in, and previously filled lines now missing.

Bad 2114s on the video board will show corruption or missing Tarzan sprite, the vines will be corrupted or missing, etc. If it's the entire screen with horizontal bands through it, it's the 93L422.
 
I just replaced both 93L422 RAMs this morning. Still no good. That stinks! Oh well. I attached another pic. Anyone have any ideas or is there anyone who would want to fix the video board?
 

Attachments

  • J King.jpg
    J King.jpg
    848.7 KB · Views: 13
Back
Top Bottom