Berea, OH
Your post is title that the game won't boot. The game can boot without displays. So which is the symptom: Does the game boot, but the displays don't work, or the game is not booting?
(Topic ID: 320183)
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Quoted from TimStevens:The game does not boot, no code on the LED on the board. My understanding is this most often means a voltage out of range, no?
That would be where to start. From my post in the bulletproofing thread, check these items first. Voltage DC level must be very close, if that is below 4.9VDC at the logic chip supply pins, booting will be questionable. AC ripple should be low, ideally in the millivolts but can often go to 1V or perhaps a little more before it causes a problem. High AC ripple is usually a filter capacitor failing.
*** Williams System 11 Power measurements and test points ***
Logic power
MPU IJ17 Pins 4,5,6 = +5.03 VDC @8.1 mV AC ripple
U26/U27 ROM Pin 1 = +4.91 VDC
Quoted from slochar:Yes, that's fine.
Some like to change the Zeners on this board to lower the voltages to around -90/+90 to save displays. As long as your offsets are close it's ok.
Like the other responders have said, does it boot and it just boots 'blind'? If so concentrate on your HV section - if it needs to be rebuilt, rebuild the entire thing, not piecemeal. Be aware that some of the replacement transistors have different leg pinouts! Double check the guides you're using carefully and match what you have and parts you order to make sure you cross over the legs, if warranted.
I am still trying to determine if this is a boot problem, or a display problem. You are talking about a display problem. The OP is talking about no code on the CPU board status display digit ...this is totally different than the high voltage displays.
The biggest difference? You can play the game without any scoring, but a non booting game won't play at all.
Which is happening here?
1 week later
Quoted from slochar:Resolder the header pins. You won't necessarily feel a cold solder joint by wiggling the connector.
That and you should also repin the cables.
Read section 2. - especially where it discusses "gas tight seal"
http://www.pinrepair.com/connect/
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