River Patrol PCB fault - No Blue Backround??

dezbaz

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Donor 4 years: 2011, 2013-2014, 2016
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Hi Guys

Just wondering if one of the PCB Gurus out there can help me

I have a bootleg River Patrol PCB (2 PCB), which recently came up "BAD RAM".

So I replaced the RAM, and got the game working again.

However the colours are all OK except the blue background is black at the moment
Click to enlarge


I have tried crossing the wires, etc, and found Blue is actually there, so it's not the monitor or chassis.

The PCB does the same on other Cabs I have



I am thinking there may be a problem with the PROMS

Does anyone know much about river patrol PCBs?

Any help appreciated
 
All I know about river patrol is that if you have a cartridge for the atari 2600, it is worth about 500-600 bucks. :)
 
I have narrowed down the PROMS to 9L, 9M and 8C

This conflicts with the MAME lists, which say the ROMS are 9C, 9N and 9P

My board doesn't even have an IC at the MAME positions, so this must be unique

I think this is Crazy Kong Hardware as the Edge connector has a modified CK Harness

Anyone seen one of these before?
 
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