(Topic ID: 305179)
Scroll to 6.16 for the display section.
https://pinwiki.com/wiki/index.php?title=Williams_System_3_-_7
Quoted from chad:Scroll to 6.16 for the display section.
That's where I got the information that probably the issue was with strobes 7-8-15-16, or IC1 or IC4 might be the issue.
Quoted from chad:The resistor on the left top side 10k ohm looks burnt.
That resistor has been changed (even though it is not related to the credit unit display).
How can I further troubleshoot IC1 or IC4? Or is there another part on this board that I can check?
Lodi, CA
You can do a basic open/short test on the ics using this method https://pinwiki.com/wiki/index.php?title=General#Testing_an_integrated_circuit
Always verify the traces on any pins that are suspect as they may be tied to ground or another pin and that can throw off your test. You can always compare against another working ic of the same type.to verify
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