If you were not able to check the sign at night , then you have to start checking the neon letter that is directly fed by the transformer , on both ends .
Before you check the neon you already know that there is power going to the transformers and the problem is from the transformers to the sign not before the transformer which could be a bad timer, a timer on tripper loose ,a bad circuit breaker , or somebody turned
You have to uncover the plastic faces and see what the neon is doing .
You could see the following scenarios;
- The letter is flickering
Could be a bad transformer or a bad neon .
Signs of a bad neon are ;
If it is red neon , and it starting to look pale orange and the glass gets hot , That is sign of a bad neon
If its white neon . . There is blackening on the electrodes and they are flickering , the neon is dim , sign of a bad neon letter
- It’s completely dead , you check for power from the feeding GTO wire by using your voltage sensor , or with your fingers you touch the neon and if you do not feel any tingling sensation , conclusion bad neon unit , so you use your jumper wire and put it between the electrodes and fire up the sign , and that was it .
- The signs that have old transformers with no GFI are the ones that will keep on damaging neon or GTO wire . It all starts with one bad neon unit , if the sign is not serviced quickly , the more time goes by the more damage to the neon and GTO wire , and that is because the electricity is causing shorts .
- The sign shuts off a second after it’s turned on.
That can only happen with a GFI transformer
The only reason it does that it’s because there is a short somewhere check the page “How do GFI transformers really work” for a better understanding of the behavior of a GFI tranformer .