Prediction Poll for why my TRON boards are dead..

vintagegamer

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As my pcb's are en route to CDJump, I thought it might be fun to try to predict why the boards are currently dead. Here are some preliminary steps I had taken, to weed out poll options:

1. I replaced the ribbon cables
2. I replaced the Z80A with a known working one
3. Removed and reseated chips
4. Installed AS power supply and adapter

At present, board displays nothing but 2 small green pixels on the lower right side of the screen.

What is your prediction on where the problem lies? I can't find a way to do poll buttons so sorry.
 
It needs an exorcism, because in the arcade days it got corrupted by being next to a Satan's Hollow.
 
Predictions: (if board didn't boot)

1. I replaced the ribbon cables -> bad cable(s) or bent a pin
2. I replaced the Z80A with a known working one -> Z80 is good but socket is bad
3. Removed and reseated chips -> many bent pins; didn't do stand-alone-check RAMs and ROMs; didn't review/replace sockets; didn't clean pins on ICs
4. Installed AS power supply and adapter -> should have kept the original power supply; Does TRON have a PSU reset signal?

Also, didn't check clocks nor resolder any bad/cracked solder joints (ie. ribbon cable connectors), didn't look for physical damage to passive components or traces.
And as such, one or more of these ends up fixing the PCB(s).

:)
 
"It's dead Jim."
 
Bad crystal
I will have mixed feelings if that's all it is. It will make for easy work for Chris, but, that I could have swapped out myself! Since everyone here felt that crystals rarely fail (and I completely understand why), I left the original one in there.
 
You won't regret sending the board set to Chris. He is the best and will return a fully functioning board set to you at a very reasonable price.
 
You won't regret sending the board set to Chris. He is the best and will return a fully functioning board set to you at a very reasonable price.
Oh I have 0 doubt in his skills at all. My mixed feelings are because I was hoping to have "the power" to fix them myself, and failed, lol
 
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