Tron pcb issue

Willowgt

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Hi there
Today I turn on my Tron Upright and did not work :(

No audio, only black and white glitches in the monitor, I checked power supply, wiring voltages are ok, change ribbon cables, and not work.

Somebody help me :(


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That's a typical TRON/MCR garbage screen. A number of factors can cause it (bad power supply, Z80, possibly 6116 RAM (I think, not sure), etc.). As you've verified your voltages, try switching out the Z80 on the SCPU board with a known good one, same for 6116 RAM. If no go then, try removing the purple wire (pin 15) from the J4 connector of the 90412 power supply and see if it boots.
 
Don't permanently remove the purple wire; don't cut it. If it boots w/o the purple wire that's a sign of another problem.

cdjump here repairs these so that's always an option if you don't want to mess with it.

Make sure you check your voltages on the board stack in addition to the linear power supply board too.
 
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