(Topic ID: 237706)

Bally -35 board not flickering.....still trying to learn boards

By Sonora70

5 years ago


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#2 5 years ago

Have you made any progress here?

Quoted from Sonora70:

The voltages across U9 seem close EXCEPT pin 5. It should be 2.8v. Im only getting .017v ...

This might be a symptom of a locked CPU rather than cause of the problem. In any case measure the resistance between that pin 5 and ground (I get around 4.6M ohms with the black lead on the ground plane of my board). If you get a substantially lower resistance it could be shorted at input pin 8 of U19.

What voltages are you measuring on pins 3 and 37 of the CPU?

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