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Help on powering on the backlight

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exo

Post subject: Help on powering on the backlight

Posted: Mon Jun 07, 2004 17:46

Joined: Tue Apr 13, 2004 23:45
Posts: 6

I had a lot of LCDÂ´s (most of them HD44780) which I canÂ´t turn on the backlight, I canÂ´t find any datasheet. I put 5V on the backlight pins but no responce. Is there any sort of inverter I can use in order to turn it on?. Sorry for my english, thanks

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Henri

Post subject:

Posted: Wed Jun 09, 2004 15:55

Joined: Sun May 05, 2002 22:05
Posts: 2063
Location: Lappeenranta, Finland

Have you tried with both polarities ? Some displays have an EL sheet as the backlight and need EL inverter.

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exo

Post subject:

Posted: Wed Jun 09, 2004 16:38

Joined: Tue Apr 13, 2004 23:45
Posts: 6

were could i find the schematic for building the EL inverter?

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Kalamake

Post subject:

Posted: Thu Jun 10, 2004 22:02

Joined: Tue Jun 08, 2004 22:12
Posts: 10

Goto photoshop (camera) and ask used onetimeuse cameras and took that flash from it.

Remove condersator, flash, that funny lamp, diode.

Now you got 120v ac that works from 1.5volts and power el-stuff.

At least el-wire works with that

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