Backlight of Text and Graphic LCD

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Backlight of Text and Graphic LCD

Postby ABSF » Sun Mar 06, 2011 11:52 am

If the backlite of your 16x2 LCD or GLCD is faulty. Is it possible to repair/replace it or just throw it away and buy a new one?
Where can you get these backlight items?

I have a Yamaha GLCD 240 x 220 with a faulty backlite. The whole thing costs RM370 (LCD+backlite). Can someone suggest a cheaper way to repair it? It works on +5V in series with a 25 ohm resistor. Has anyone tried with a few white LEDs in place of the backlite?

Allen
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Re: Backlight of Text and Graphic LCD

Postby kl84 » Mon Mar 07, 2011 10:46 am

I've never done that. Can try to remove the backlight but keep the white screen. Usually the backlight has a piece of white screen to even the light source, but not all are removable though. Then solder the smd leds at the corners/edges, focus to the center of the lcd. Or may be place the some smd leds in grid under the lcd screen.
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Re: Backlight of Text and Graphic LCD

Postby ABSF » Mon Mar 07, 2011 11:17 am

Thanks kl84. I'll try it out with a used text LCD that came without backlte and put some SMD LED underneath. But first I have to savage some LED from used printer PCB.

Will post here if it works.

Allen
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Re: Backlight of Text and Graphic LCD

Postby sich » Tue Mar 08, 2011 1:12 am

Wow...going into DIY lcd backlight now. Good good... :D
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