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Bally 6 digit display


lentildude

Question

Been trying to fix one of my Matahari score displays

 

It is totally black, all other displays working fine.

 

I have swapped out the BCD chip, replaced a few transistors in case some digits fire up, 100k resistors swapped, but still black

 

There is 180v on the HV, other end of Zener is 80v - same as other displays.

How can you confirm the gas discharge screen is faulty??

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