MTH blinking sign stopped working

Do you hear the squeal (high-pitched whine) of the board?  You may need to turn off any trains or what have you.

I realize you tested the board, but my question is does the squeal change pitch when you plug the sign vs. not plugged in.  That is, I don't know what the actual voltages are but they are somewhat difficult to accurately measure since it's a high-frequency AC voltage probably 100V or so.  A typical hobby multi-meter cannot accurately measure such a high-frequency signal.  I only suggest this because it should only take a couple seconds and if the squeal changes, it can indicate that some form of electrical connection is being made to the sign itself.

Presumably you carefully inspected the 3 connections where the gray cable mates to the copper colored flex-cable.  Virtually impossible to confirm the 3 connections between the flex-cable and the sign itself.  You might try pressure against the tape and sign to see if a loose connection there...though it would be verify difficult to repair (e.g., conductive paint/glue) without damaging the sign.  The current is very low so you don't need "0 Ohm" joints.

I know if it is a miller sign company the  screen or sign do fail and you have to purchase another sign form miller company and it will work again  the miller sign company does come to the meet in York PA!

Alan

I can hear the squeal on the good sign and bad sign using the same board.  You may have to turn your speaker up if you care to listen.

My "All Aboard" Miller sign kept losing features and certain areas wouldn't light any more. After calling them, I returned the bad sign and they sent me a whole new one for no charge. Hard to beat that service. Might be worth a shot, Ron.

Oh well, the squeal cycling sounds the same with the broken sign; I was "hoping" for a shorted sign which might be found by visible inspection - where you might hear the board "groaning" under the load.  But both videos sound the same with a peaceful un-labored pitch.

For the technorati, I did an audio frequency analysis of the video.  The squeal frequency of the step-up voltage oscillator is about 3400 Hz.

If you can get a new sign for free that's obviously the closest exit!

Wow Stan... Thanks so much for the analysis.

Well I think this Bldg is from 2009.   I probably purchased it in the 2012-2014 time frame?  Can we even be sure it's a Miller sign?  It came with the MTH Bldg.  Maybe I'll search the Bay for Window signs.

Ron