(Topic ID: 253661)

Black Knight CPU freezing


By Andy_B

8 months ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 8 months ago by pincoder
  • Topic is favorited by 1 Pinsider

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#1 8 months ago

I'm having a problem with my BK CPU locking up.

I have finally got my 2nd system 7 board working (Thanks to Marco's test ROM), put it in the machine with the same result, although the machine freezes after a minute or so with this second CPU board whereas with my first CPU board it could go up to 45 minutes without locking up. Before locking up the machine plays fine.

It isn't a voltage issue as the PSB supplies 4.99v and there is no fluctuation when the CPU locks up.

The soundboard is disconnected so the only common parts, discounting the PSB, are driverboard and game ROMs. The driverboard and CPU pass all the tests with Marco's test ROM and the game ROMs are new.

Can anyone suggest where to start?

#2 8 months ago
Quoted from Andy_B:

I'm having a problem with my BK CPU locking up.
I have finally got my 2nd system 7 board working (Thanks to Marco's test ROM), put it in the machine with the same result, although the machine freezes after a minute or so with this second CPU board whereas with my first CPU board it could go up to 45 minutes without locking up. Before locking up the machine plays fine.
It isn't a voltage issue as the PSB supplies 4.99v and there is no fluctuation when the CPU locks up.
The soundboard is disconnected so the only common parts, discounting the PSB, are driverboard and game ROMs. The driverboard and CPU pass all the tests with Marco's test ROM and the game ROMs are new.
Can anyone suggest where to start?

New 40 pin (on both boards)
New header pins on all boards
Recap power supply
New ROM sockets
New CPU socket
New ROM chips (never seen these be bad but it can happen)

#3 8 months ago
Quoted from Schwaggs:

New 40 pin (on both boards)
New header pins on all boards
Recap power supply
New ROM sockets
New CPU socket
New ROM chips (never seen these be bad but it can happen)

I've done the female side but not the male pins
I have ony replaced the power headers on the CPU
PSB has been re-capped
ROM sockets, CPU and socket and new ROM chips all fitted.

I will have the ROMs checked and probably do the header pins on the driverboard first as these are the constants in the locking up problem.

#4 8 months ago

You can also try these test ROMs: http://pincoder.ca There's lots of different ROMs you can use to diagnose problems..

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