So I got this Dragon pin and it only had GI lighting
I found it had no 5 V out on A2P2
Bought a Big Daddy's System-1 Power Supply repair kit and installed all the components. I checked all the transistors (Q1, Q2, Q3 and Q4) to make sure they weren't shorted to ground before installing it.
I installed it and found it is missing the -12 V
With only A2 P1 connected:
The LM7912 Regulator (LIC1) has nothing out of pin 2
pin 1 and pin 3 are reading correct voltages
How can I troubleshoot it further to determine if it's a bad LM7912 or maybe something in the crowbar circuit... SCR201 for example?
I found it had no 5 V out on A2P2
Bought a Big Daddy's System-1 Power Supply repair kit and installed all the components. I checked all the transistors (Q1, Q2, Q3 and Q4) to make sure they weren't shorted to ground before installing it.
I installed it and found it is missing the -12 V
With only A2 P1 connected:
The LM7912 Regulator (LIC1) has nothing out of pin 2
pin 1 and pin 3 are reading correct voltages
How can I troubleshoot it further to determine if it's a bad LM7912 or maybe something in the crowbar circuit... SCR201 for example?

