screen get iluminated when plug in midi out of my computer

[toxictv101]

dont know what happen <with my midi box

when i plug the midi cable into the "in"

the screen get light, even if the power is not ON

???????????  i wonder if it s not the ground of my computer

that is not the same of my midibox ???

[smashtv]

Heya Toxic!

Sounds like you are passing power through the Core MIDI out, not good at all...

Clip the middle pin of Core:J13 (MIDI OUT) and see if this cures it.....if not there is another ground path (cases touching?).

If you are using my Core R4 board and onboard jacks, cut the trace labeled "GND LIFT" between the holes....this has exactly the same effect as cutting J13:pin2.

(I put the two pads/holes there so a 2 pin pinheader could be installed and jumpered drive select style if the trace is cut)

Please let us know how it works out, I am compiling notes for a future wiki entry on this issue.

Best

SmashTV

[toxictv101]

hey,

i m trying with a another computer

and everythings is normal

i think that the midi out of my 1rst computer is out

anyway this not work again :p

i ll change the opto , i wonder if he s coulnt be out

after that ... ???!!!

[toxictv101]

is it possible that my screen is broken

if it display only a line on the first caracter row???

could it be the decoder inside that is out ???

[moebius]

Hi toxic

We would really like to help You, but You don't give enough information about your setup ect.

if it display only a line on the first caracter row???

Tells us that screen looks like initializing correctly. Can You see anything coming from the midibox -> PC midi input? Did your core module pass voltage tests as explained in the core module page at uCApps.de?

ect.

Moebius

[toxictv101]

hm.. hm

the screen always stay with the first line car. Black ( white)

i would like to know if it would be because the screen is dead.

, i think that my lcd screen is broken

it was a prety expensive lcd 2x16 white with carr. and blue font

"29€"  snif snif  :'(

maby the midi cable with vdd on it was fatal

because when i turn midibox it send midi message

like it must do.and everything seem to be ok

exept this bad lcd,

i ll change it now.

[NorthernLightX]

I think (and hope) you didn't upload MIOS yet, because if you didn't, the behaviour you're reporting is exactly as expected. As in "perfectly normal working order".

The MIDI message must be the PIC reporting itself as ready to be supplied with MIOS.

[toxictv101]

yop,

yes everything was working well , exept the Expensive Blue/white led Lcd

that is BreaKed i Dont Know Why.

With The NeW LCd everything is Ok , aNd Work Well

  ((( So if The First Line oF the LCd Stay Black , It can bE That

              the Lcd himself is OUT )))  :'(

Tks To All For Help

And Enjoy diy Electronics ,,,

Julien, BELGIuM

[NorthernLightX]

yop,

yes everything was working well , exept the Expensive Blue/white led Lcd

that is BreaKed i Dont Know Why.

With The NeW LCd everything is Ok , aNd Work Well

  ((( So if The First Line oF the LCd Stay Black , It can bE That

               the Lcd himself is OUT )))  :'(

Tks To All For Help

And Enjoy diy Electronics ,,,

Julien, BELGIuM

Hi Julien,

your keyboard looks broken too ;)

Are you sure the problem with the LCD is not just a short or a miswire of some sort? I'd be happy to test it for you as soon as I have a Core online... (I'm in Holland)

Cheers,  Alex.