I bought a DK JR board that was non-working. Here's what I've done to it so far.
-Replaced the missing z80.
-Verified the VIDEO board is 100% functional and good by attaching it to my working CPU (including ribbon connectors and rainbow cable) -- all problems are most likely related to the CPU board.
-Used my braze HSS kit to find and replace a couple of bad ram on the CPU board.
-Replaced the chip at 7k on the CPU board.
-Verified the chip at 7h CPU is good by testing it in my good JR board.
-Dumped and verified that all ROMs are good using mame/romident.
The board is being tested in my DK JR cocktail, which plays my DK JR, DK and Mario Bros pcbs flawlessly. However, this board still has the following issues:
Issue 1: The colors are weird and there are huge blue areas intermittently on the screen. I'll try to get a picture of this issue later to better explain. This COULD possibly be a monitor adjustment issue, but as I said, my other DK/JR/Mario boards display great without adjustments.
Issue 2: No intro music, no background music. Replaced 7k, verified 7h, no change. Haven't yet replaced 8k, C24, C25 as recommended on Mikesarcade/brasington.
Issue 3: Jump sound sounds REALLY weird. Crash sound missing. No walk sound.
Issue 4: Image displays upside down. My Good DK and JR boards display properly in the cocktail, right side up to the Player 1 side. The bad one is upside down, so when the game starts, it is right side up for the Player 2 side. No clue where to start with this one.
Anyone have any suggestions?
EDITED to add: The board behaves the same with/without the HSS kit attached.
EDITED again for clarity.
-Replaced the missing z80.
-Verified the VIDEO board is 100% functional and good by attaching it to my working CPU (including ribbon connectors and rainbow cable) -- all problems are most likely related to the CPU board.
-Used my braze HSS kit to find and replace a couple of bad ram on the CPU board.
-Replaced the chip at 7k on the CPU board.
-Verified the chip at 7h CPU is good by testing it in my good JR board.
-Dumped and verified that all ROMs are good using mame/romident.
The board is being tested in my DK JR cocktail, which plays my DK JR, DK and Mario Bros pcbs flawlessly. However, this board still has the following issues:
Issue 1: The colors are weird and there are huge blue areas intermittently on the screen. I'll try to get a picture of this issue later to better explain. This COULD possibly be a monitor adjustment issue, but as I said, my other DK/JR/Mario boards display great without adjustments.
Issue 2: No intro music, no background music. Replaced 7k, verified 7h, no change. Haven't yet replaced 8k, C24, C25 as recommended on Mikesarcade/brasington.
Issue 3: Jump sound sounds REALLY weird. Crash sound missing. No walk sound.
Issue 4: Image displays upside down. My Good DK and JR boards display properly in the cocktail, right side up to the Player 1 side. The bad one is upside down, so when the game starts, it is right side up for the Player 2 side. No clue where to start with this one.
Anyone have any suggestions?
EDITED to add: The board behaves the same with/without the HSS kit attached.
EDITED again for clarity.
Last edited:
