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Purchase or borrow a strong magnifying glass and examine EACH one of the soldered pins for the display. The solder joint should be smooth and continuous and shouldn't have any cracks.
Some of the solder joints on the EBTCM board are horrible. I cant believe that they passed inspection.
One of the solder joints on your board or something where the vacuum florescent tube connects is poor.
Bill
I never even thought about looking through a magnifying glass
This could also be the time to maybe see if a local electronics repair store might be able to see a problem. I remember when I looked at my dim HVAC solder joints they did not look bad. Resoldered them and now it works fine.
This could also be the time to maybe see if a local electronics repair store might be able to see a problem. I remember when I looked at my dim HVAC solder joints they did not look bad. Resoldered them and now it works fine.
Just make sure that you properly communicate to the repair tech that you have an INTERMITTANT issue with the vacuum display. That will allow him to concentrate on looking in the correct areas.