Hi
Thanks for using FixYa. If the fans are working and the lamp is fine then the issue is with the ballast going bad. Ballast is the power supply source for the lamp, when you turn the unit on checkif you hear crackling or see a spark from the ballast as you have the back off then it means ballast(which is the power supply source of the lamp) is good, if not then you’ll have to replace the ballast. You can also test the wire that runs from the ballast to the power supply and check if it reads around 300vdc...if it does then you need Ballast. If it’s good then it’s the DMD Board that should be replaced.Please do accept the solution if the issue is resolved or post a comment for further assistance.
Thanks
Rylee
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what is the DMD board
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