Quoted from ltngbolt:Hey Roamin,
I measured the white wires at the transformer and got 87.5V
I measured again at the j105 connector this time on the side of the connector where I could probe the pins better and got 85.5.
I measured again at the DMD display and same as before
Brown -pin8 is 4.27V should be 62V
So is the DMD Controller Board bad?
Would this add-on board work? Cheaper than a new board or repairing the old one
Here's what's advertised -- New High Voltage circuit replacement satellite module for the Williams part A-14039 Dot Matrix controller board
This piggyback power supply board replaces the commonly burnt high voltage power supply section of any WPC A-14039 dot matrix controller board by mounting on top of the existing board.
Thanks
I believe you mean J605 ? Because connectors starting with a "1" belong to the power driver board, in this case J105 powers the fliptronic board.
Ok , if you have 80+ at J605 pins 1 and 2 while disconnected and it drops to 40 while connected , this means there is indeed an issue with the high voltage circuit. This part of the circuit is very simple for anyone who can do repair. It is only a few resistors , few capacitors , few transistors and a zener diode. I would send it in with the Power driver board to get fixed as well.
Can you post a close up picture of the area with the 2 fuses on the dot matrix controller ? Maybe we can spot a burned component.
If you pull J605 and disconnect the ribbon cable going to the dot matrix controller, does the machine boot with no DMD and obviously no flashers working ?
Here is the circuit for the 62v you are missing , 80VAC coming in on the left before going to rectifier and then regulated to 62v. There is but a few components and that's it, shouldn't cost much to get that back on track.
If , your issues are just the BR4 / Cap from the power driver board and a few components on the dot matrix controller , then the repair should not cost so much.
62v.png