(Topic ID: 85292)
Linked Games
Ali
Stern Electronics, 1980-
Baby Pac-Man
Bally, 1982
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Big Game
Stern Electronics, 1980
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Black Jack
Bally, 1978
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Black Pyramid
Bally, 1984
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BMX
Bally, 1982
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Bobby Orr's Power Play
Bally, 1978
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Catacomb
Stern Electronics, 1981
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3 weeks later
Can't start a game on my Lost World.
It does not boot for some reason (not a single flash) and the green led stays on.
All testpoints are getting their voltages and all ic sockets have been replaced and all connectors are cleaned. (It did not fix it)
Also the displays and insert lights stay off.
It's like the machine doesn't get told what to do; broken rom?
Anyone got a clue? Thanks in advance 
20191222_204202 (resized).jpg20191222_204225_HDR (resized).jpg
1 week later
Thanks everyone for your help!
Quoted from snyper2099:Bad 5101 ram chip or it’s socket. Also, could be that the battery has failed and is causing problems.
Those are next two things to check.
Replaced it and also the 6800 chip but no luck. Measured the battery and it's good.
Quoted from Chalkey:Solid LED can also be the reset circuit, look up the test of bridging pins 39 and 40 on one of the chips to verify.
Sometimes it resets, sometimes it doesn't.. What to do? 
Quoted from Inkochnito:Not a flash means no program to start.
So, yes rom problems.
Check your solder work again and wire the board to accept 2732 eproms.
Burn new eproms and try again.
I think this is the next thing to do.
1 week later
Okay so my Lost World still doesn't boot..
I checked all voltages (all okay), got new cpu eproms and put the right jumpers in, replaced 5101 and replaced the 6800, cleaned all connectors, cleaned all pins and cleaned all ic's.
The led stays on and does not flash once. 
Anyone got ideas? (I'm really stuck right now)
All I can think of is the reset circuit, but I don't know how (and what) to measure.
Quoted from vec-tor:On Bally cpu, it should be 0 then a snap up to +5 volts. Aprox.
*
1) I would check to make sure all data and buss lines have continuity
--- to all components first.
Thank you vec-tor!
The problem I have is that the game didn't come with a manual, and that the electrical drawings from ipdb are unreadable 
So I would need a readable manual or photo from the cpu board drawing first..
Quoted from Quench:Refer to the Playboy schematics on IPDB for a clear MPU board circuit diagram - same board.
That's good news, thank you very much!
I can continue my quest on finding out why it doesn't boot 
Quoted from JethroP:Have you been to the pinwiki? "Section 5.5.1 LED locked on".
https://www.pinwiki.com/wiki/index.php?title=Bally/Stern
No I have not.
Thank you for the advice!
1 month later
Quoted from RobDutch:I think I finally found out why my Lost World is not working...
Look at that pretty clock signal my cpu was getting
Replacing both U15 and U16, hope that it will fix it
[quoted image]
It did not fix it. The problem might be in my scope settings.
On this photo you can see U15 pin 5, which seems to be pretty correct.
But the machine is still not booting (no flashes), anyone has an idea?
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