OpenELEC Forum
[FIXED] Odd behavior of power LED with Zotac IONITX-A-C and Mini-Box M350 case - Printable Version

+- OpenELEC Forum (https://forum.openelec.tv)
+-- Forum: Generic Forum (https://forum.openelec.tv/forumdisplay.php?fid=5)
+--- Forum: INSTALLATION (https://forum.openelec.tv/forumdisplay.php?fid=6)
+--- Thread: [FIXED] Odd behavior of power LED with Zotac IONITX-A-C and Mini-Box M350 case (/showthread.php?tid=34349)



[FIXED] Odd behavior of power LED with Zotac IONITX-A-C and Mini-Box M350 case - aussiedownunder - 05-18-2012

Hi all, I'm sharing this little fix because it really stumped me and there was little info on the net about it.

I've just built up a new HTPC based on the Zotac IONITX-A-C board in a Mini-Box M350 case, nothing flash but nice and compact. After all the usual tweaks I got it working well with the exception that the case LED was exhibiting really strange behavior. When the power is first plugged in on the rear of the case the power LED is off. Press the power button on the front of the case and the machine starts up but power LED is still off. Switch the box off, either via front button or through XBMC menu and the box turns off but now the power LED flashes on-off, very annoying, especially at night when everything is dark. I checked the polarity as shown in the manual for both the case and the motherboard - all good here. Checked the BIOS settings and then the web and found a couple of other people with the same problem - one apparently fixed it by putting a diode in series with the LED power lead. Now this does not make a lot of sense but it did get me thinking so I decided to ignore Zotacs polarity markings and swapped the header jack around on the board and hey-presto, power LED working as expected, ON when machine running and off when not. Turns out the LED's on the M350 case are not like real LED's and either Zotac or Mini-Box have their polarity around the wrong way, just seems odd that the fix was as easy as this and a lot better than unplugging the power LED lead altogether.

Anyway, solved my problem and hopefully may help others.