Re: [uCsimm] LCD issues

From: Tom Walsh (tom@cyberiansoftware.com)
Date: Mon Jun 26 2000 - 10:42:12 EDT


Filip Peters wrote:
>
> Hello Tom,
>
> Tom Walsh wrote:
>
> > In case anyone needs data on the Sharp LM32019 display, it can be found
> > at:
> > 'http://www.openhardware.net/ez328simm/technotes/Sharp-LM32019.pdf'. In
> > order to use this display, you will need a connector, Molex P/N
> > 52044-1245, and a High Voltage inverter which they also will sell you at
> > Earthlink (same people for the LCD), the LCD is quite useless without
> > the backlight supply.
> >
> > When you get the LCD + supply, DO NOT HOOK IT UP, until you have
> > correctly identified the polarity to use for the 12 supply to the HV
> > Inverter (I destroyed one discovering this). The GROUND connection can
> > be identified with an OhmMeter, there were four mounting holes on the
> > unit they supplied me with (2 holes + 2 slotted), one of the mounting
> > holes will have a plated-through copper land around it, this is the
> > GROUND connection (Pin 2), the other connection is the +12 volt line
> > (Pin 1).
> >
>
> I had also a defective inverter. I don't think I destroyed it by reverse polarity, I
> was very carefull in checking the polarity, but when I powered it up I had no
> backlight. Probably the fuse on the inverter is a bit trigger happy, and blew when I
> connected it. It's the little black SMD thingy next to L1, labelled with 0.5A. When I
> bridged it with a short piece of wire I had a working inverter! So you can still use
> this inverter for experimental work (probably not for sending it to a customer..)
>
> Greetings,
>
> Filip.
>
> --
> Ir. Filip Peters
> fp@metris.be
>
> This message resent by the ucsimm@uclinux.com list server http://www.uClinux.com/

Filip,

        Thanks for that observation, I "glanced" at the blown board, but didn't
see a fuse. I'll look again.

Regards,

TomW

-- 
Tom Walsh - WN3L - Embedded Systems Consultant
'www.openhardware.net', 'www.cyberiansoftware.com'
"Windows? No thanks, I have work to do..."
This message resent by the ucsimm@uclinux.com list server http://www.uClinux.com/



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