I had a look over the previous comments and thought I’d add what happened and things I tried.
At times, steam would get into the display area and fog it up a little. When I saw the display wasn’t working, I could still make coffee as normal (but has to remember to press the button to confirm for cleaning the milk jug and pipe).
When I looked at the LCD board, the first 2 pins (closest to red connector which comes from main board) were corroded to each other (looked like brown rust). I assumed cleaning this would fix it, I think previously the display was clear, then it became black (natural state without power).
So cleaning didn’t fix it, I’ve also cleaned the main board and looked around for issues. I’ve added flux and resoldered all components on the display/button board and the ones around the connector on the main board at the back of the machine.
So, it seems most likely that if the display is working, its voltages pulled below 3V.
Thanks a lot for your guide. I’m trying to fix my machine, its a similar model (Syntia Capaccino) with automatic milk frother.
The display doesn’t work at all. I’ve measured voltages on the board. There are 4 zeners, 2 of them are just below 2.7V, one is just over 2.7V, the 3rd is 3V (seems directly for the display, same with one of the 2.7V one).
I can’t find the datasheet for this display, but reading the datasheet for Winstar displays, they need at least 3V, preferably 3.3V.
I thought maybe zeners have different tolerances and swapped the 3V and 2.7V, but didn’t make a difference in their voltages. All voltages have 5V coming from the main board at the back, so this must be pull up resistors. I still have to look at it further.
I’ll have to make a schematic for the small board. I know that some voltages will be for the buttons and hall sensors for the front selector, and ones for the display may be pulled up and down for enable signals.
Is anyone able to find a datasheet? I’ve asked the seller
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
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