Author Topic: Popeye boardset - No boot- Random characters on screen  (Read 274 times)

Offline WannaTheater

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Popeye boardset - No boot- Random characters on screen
« on: March 14, 2020, 05:05:31 PM »
Dug out a popeye boardset, and it is not booting.  It is displaying random character pattern.  I reseated all socketed ICs and ribbon ribbon cables.  The boards are very clean (no socket corrosion, etc).  Replaced Z80 with a known working one.  No change. 

Before I go digging for schematics and logic probe, any tips?  (ICs prone to failure, etc?)
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Offline Richie107

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #1 on: March 14, 2020, 05:39:09 PM »
Check power supply voltages... thats where I usually check first

Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #2 on: March 14, 2020, 08:32:39 PM »
Board is in a cabinet with a known-good power supply. (I have a 2 board switcher from from High Score Saves)
So the issue is isolated to either the CPU board or the Video board of the Popeye stack.
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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #3 on: March 15, 2020, 11:50:09 AM »
Logic probed the Z80 - Power/GND OK, address and data lines seem to be toggling properly.
Pulled the main CPU EPROMS (7A, 7B, 7C, 7E), read the contents using GQ-4X, and compared using Hamsters online ROM Identification tool.
EPROM 7E did not check out correctly.  Erasing now and will re-burn to see if it corrects the problem.
« Last Edit: March 15, 2020, 11:58:46 AM by WannaTheater »
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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #4 on: March 15, 2020, 02:21:52 PM »
Reburning (and verifying) EPROM 7E did not solve the issue.
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Offline k7

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #5 on: March 15, 2020, 04:55:33 PM »
you have better tools than i to even troubleshoot as well as you have already. and i had the cleanest AS-2518 Bally MPU on earth. damm thing never booted. :P

upload a screen shot. below is a great donkey kong graphic glitch website (w/ more pics under the DKjr graphic issue page). use those pictures to help troubleshoot / compare your issues :) :

http://www.brasington.org/arcade/tech/dk/
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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #6 on: March 15, 2020, 05:21:23 PM »
Thanks Chris for the great reference.  I wish I was getting that far.  I think the Z80 is running fine- all the data and address lines are toggling, as are the address and data lines on the 4 CPU EPROMs.  I just went through the Video board ROMs, and one is showing on Hamsters site as some game I've never heard of...  I've been trying for the last few hours to burn to it, but can't seem to get it to write (MBM2764-30).  I am starting to think this one EPROM is shot.
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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #7 on: March 15, 2020, 06:57:48 PM »
The EPROM code is being identified as "Snake Pit," which I believe means empty.  I UV erased it, then burn the required .bin, which sometimes seem like it burns, then read the .bin back, and it still shows snake pit.  And the burned EPROM shows the bin as still being empty....   
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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #8 on: March 17, 2020, 06:06:29 PM »
Bad RAM on CPU board (TMM2016).  Looks like I can replace with 6116?  Any comments/suggestions on source (Couldn't find on Mouser or Great Plains)
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Offline k7

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Offline WannaTheater

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Re: Popeye boardset - No boot- Random characters on screen
« Reply #10 on: March 21, 2020, 01:49:35 PM »
Replaced CPU RAM with a 6116 from Twisty Wrist arcade.
Boots up and plays.  Some graphics issues, but I am thinking they will be fixed when I replace a known bad EPROM on the Video board.
« Last Edit: March 21, 2020, 01:53:28 PM by WannaTheater »
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