Reprap Full Graphic Smart Controller starts beeping and flashing backlight
December 05, 2021 05:41AM
Hi all,

suddenly the RepRap Full Graphic Smart Controller Board on my Fabricator Mini 1.5 started to flash the backlight and beep in roughly a one second rhythm. A few minutes earlier it was still working. Since it worked before and the cables on both sides have keyed connectors, I can rule out that the cables are connected wrong.
The only thing I noticed before the failure was that the display itself was showing a low contrast section in the middle of the display that has appeared there a while ago and the backlight might have been a little bright.
What could cause this?

Best regards,
Reiner
Re: Reprap Full Graphic Smart Controller starts beeping and flashing backlight
December 05, 2021 06:39AM
5v voltage regulator on the megs is dying/dead

If you plug in USB it will probably bypass it and work. but is not a long term solution.
Re: Reprap Full Graphic Smart Controller starts beeping and flashing backlight
December 05, 2021 01:10PM
Pluging in USB did not help. With the display disconnected, I measure 4.9V between pin 9 and 10 on EXP1. If I connect the display, the voltage drops to ~0.5-07V.
The board is a MKS Base V1.3. Is there anything I can check before extracting the whole mainboard?
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