Backlights gone on LCD. Can I use LED?

mikee55 · 6th August 2008, 04:59 PM

Hello, my LCD has no backlights, but the display works all be it black. Could one use a row of LEDS instead? Obviously I would use white ultra bright ones.

Or am I damn silly???

Mike

poynton · 6th August 2008, 07:46 PM

It depends on what the original lighting was.

New electroluminescent strips are available (some where in Germany)
It may also be the HV psu for the above.

Otherwise why not leds?

Andy

mikee55 · 6th August 2008, 10:04 PM

Its the usual Cold Cathode Flouresent, except it had Four of them. Two at the bottom, two at the top.

I don't know how to test them, or the powersupply. The 12v Power module that came with the monitor has also failed. The display does work though. I've ran it off the Molex connector of my PC's power Supply and you can see an image. I figured 6 bright LEDS at the bottom and another 6 at the top. I could assemble them inside the narrow reflector strips that the CCFL's reside in, and ran the whole lot of a new power supply.

Cheers Mike

rcavictim · 6th August 2008, 10:26 PM

I have a NAD CD player, good old single play front load with analog power supplies inside (good, no switchmode noise generating junk!). It had a burnt cartridge fuse type lamp behind the backlit LCD display which is why I got the unit, otherwise mint and working perfectly for free at the dump.

I replaced it with two small peanut lamps. The room has to be dark to see the orange/red display. I am not pleased. I think I'll go in and put a row of 5 bright white LED's in there. I expect to have to rig a series R and possibly diode. If there is an interference pattern from the display scan rate beating with the power if 60Hz I will further add a filter electrolytic across the LED bank.

digitalstore · 9th August 2008, 07:30 AM

Quote:

Originally posted by mikee55
Hello, my LCD has no backlights, but the display works all be it black. Could one use a row of LEDS instead? Obviously I would use white ultra bright ones.

Or am I damn silly???

Mike

What are u trying to say? I could not understand.

sdubb123 · 31st August 2008, 06:33 PM

but of course you can

http://hackedgadgets.com/2007/02/18/...ed-conversion/

6th August 2008, 04:59 PM	#1
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	Backlights gone on LCD. Can I use LED? Hello, my LCD has no backlights, but the display works all be it black. Could one use a row of LEDS instead? Obviously I would use white ultra bright ones. Or am I damn silly??? Mike __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

6th August 2008, 07:46 PM	#2
poynton diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves ( When I'm not at home in N. Wales )	It depends on what the original lighting was. New electroluminescent strips are available (some where in Germany) It may also be the HV psu for the above. Otherwise why not leds? Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY. 14-Nov - home for 5 weeks !!

6th August 2008, 10:04 PM	#3
mikee55 diyAudio Member Join Date: Dec 2005 Location: West Howe	Hi poynton Its the usual Cold Cathode Flouresent, except it had Four of them. Two at the bottom, two at the top. I don't know how to test them, or the powersupply. The 12v Power module that came with the monitor has also failed. The display does work though. I've ran it off the Molex connector of my PC's power Supply and you can see an image. I figured 6 bright LEDS at the bottom and another 6 at the top. I could assemble them inside the narrow reflector strips that the CCFL's reside in, and ran the whole lot of a new power supply. Cheers Mike __________________ If it don't work, I'll fix it in the mix! Or visit http://lsdp.proboards.com/index.cgi

6th August 2008, 10:26 PM	#4
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	I have a NAD CD player, good old single play front load with analog power supplies inside (good, no switchmode noise generating junk!). It had a burnt cartridge fuse type lamp behind the backlit LCD display which is why I got the unit, otherwise mint and working perfectly for free at the dump. I replaced it with two small peanut lamps. The room has to be dark to see the orange/red display. I am not pleased. I think I'll go in and put a row of 5 bright white LED's in there. I expect to have to rig a series R and possibly diode. If there is an interference pattern from the display scan rate beating with the power if 60Hz I will further add a filter electrolytic across the LED bank. __________________ Cheers, Bob Palindrome Effective single question I.Q.Test. Q: Have you ever purchased a recreational snowmobile?

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31st August 2008, 06:33 PM	#6
sdubb123 diyAudio Member Join Date: Aug 2008	but of course you can http://hackedgadgets.com/2007/02/18/...ed-conversion/

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