Author Topic: LED stripe repair  (Read 33356 times)

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mulja

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LED stripe repair
« on: January 19, 2016,16:14:56 »
Hi to all

Just see lot off topics with LED light faults!

Want to share how i repair LED stripe, i  attached all in pictures :)

1. First have to find faulty led
2. Desoldered old one
3. Cut one from another stripe ( new one or old stripe with good led )
5. Solder new cutted to your stripe

to see pictures you have to be regestered user
« Last Edit: January 19, 2016,16:28:29 by mulja »

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LED stripe repair
« on: January 19, 2016,16:14:56 »

mulja

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Re: LED stripe repair
« Reply #1 on: January 19, 2016,16:20:29 »
More pictures :)
« Last Edit: January 19, 2016,16:23:39 by mulja »

downunder

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Re: LED stripe repair
« Reply #2 on: January 20, 2016,02:39:44 »

Hi Mulga,

That's an excellent pictorial. Thanks for sharing.

Bruce

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Re: LED stripe repair
« Reply #2 on: January 20, 2016,02:39:44 »

thoma

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Re: LED stripe repair
« Reply #3 on: January 20, 2016,06:46:30 »
Hi Mulji!
very good thank you!Please post how much is the voltage setting at your powersupply!setting currentlimit?
regards thoma!

http://kompendium.infotip.de/led-backlight-treiber.html
https://sites.google.com/site/lcd4hobby/7-backlight/a-led-backlight

mulja

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Re: LED stripe repair
« Reply #4 on: January 20, 2016,08:10:40 »
My power supply is with adjustable voltage

for LED i put 3 volt

thoma

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Re: LED stripe repair
« Reply #5 on: January 20, 2016,10:55:08 »

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Re: LED stripe repair
« Reply #5 on: January 20, 2016,10:55:08 »

Turnip

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Re: LED stripe repair
« Reply #6 on: January 20, 2016,12:19:42 »
Hi thoma,

Use a regulated power supply set to max current rather than voltage. Set to maybe 100 m/a then slowly increase voltage 'till string fires up. If it doesn't, there's an O/C Led or print break - Chris.

thoma

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Κώστας

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Re: LED stripe repair
« Reply #9 on: May 02, 2016,00:36:16 »
How do I find the correct part number for smd leds backlight your LED TV ?
There are enough of them on the market.

http://www.sahy.cz/sahy/eshop/5-1-LED-podsviceni-LED-backlight
« Last Edit: May 02, 2016,00:58:54 by Κώστας »


bonesy

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Re: LED stripe repair
« Reply #11 on: January 24, 2017,07:18:57 »
I've started refurbing LG strips now.I've built up a stock of 47" & some 50" strips now.I bought some genuine LED diodes from a guy on e-bay listed as 10 for £10,but because I was trade & bought stuff from him before I got 16.I'm sure there's cheaper sellers out there,but these are a genuine LG LED.
What I do now is,locate the duff LED/LED's on the strips,using a bench psu,usually around 3volts to light LED.To remove old LED,I use my side cutters to take off top layer of LED,then your left with metal base of LED,then with soldering iron,flow solder over the remnants,this will then easily come away.Clean up board,apply a small amount of solder to the smaller of the two solder pads.Using tweezers,checking diodes the right way around,reheat the soldered pad,slide diode into place,solder second pad,clean board,job done.To re glue the plastic lenses I bought some 5 second "glue" which is like a thick glue,postion lens,then zap with uv light 5seconds,job done.The only one I'm battling with is a Panasonic,that's got a Chinese screen fitted to it,nearly  all the strips have got at least one LED duff,plus they glue down the white plastic sheet to metal work,very tricky getting it off,lots of hair dryer & pulling.Hope it helps someone out.I've also bought some anti static gloves from e-bay,so no finger prints on display when you remove it & no static discharge to screen when handling.They are only cheap & saves a lot of cleaning afterwards.
« Last Edit: January 24, 2017,07:21:56 by bonesy »

ahd540

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Re: LED stripe repair
« Reply #12 on: May 13, 2017,10:15:57 »
merci bien mon ami

vinceroger69

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Re: LED stripe repair
« Reply #13 on: May 16, 2017,11:21:17 »
I've started refurbing LG strips now.I've built up a stock of 47" & some 50" strips now.I bought some genuine LED diodes from a guy on e-bay listed as 10 for £10,but because I was trade & bought stuff from him before I got 16.I'm sure there's cheaper sellers out there,but these are a genuine LG LED.
What I do now is,locate the duff LED/LED's on the strips,using a bench psu,usually around 3volts to light LED.To remove old LED,I use my side cutters to take off top layer of LED,then your left with metal base of LED,then with soldering iron,flow solder over the remnants,this will then easily come away.Clean up board,apply a small amount of solder to the smaller of the two solder pads.Using tweezers,checking diodes the right way around,reheat the soldered pad,slide diode into place,solder second pad,clean board,job done.To re glue the plastic lenses I bought some 5 second "glue" which is like a thick glue,postion lens,then zap with uv light 5seconds,job done.The only one I'm battling with is a Panasonic,that's got a Chinese screen fitted to it,nearly  all the strips have got at least one LED duff,plus they glue down the white plastic sheet to metal work,very tricky getting it off,lots of hair dryer & pulling.Hope it helps someone out.I've also bought some anti static gloves from e-bay,so no finger prints on display when you remove it & no static discharge to screen when handling.They are only cheap & saves a lot of cleaning afterwards.

Hi i have recently brought some lg leds (not of your ebay seller) if you get a chance could you upload a picture of the back of a new led you have purchashed as i have noticed a lot have diffrent anode cathode pad shapes so be nice too see what a genuine one should look like thanks 

panitesh

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Re: LED stripe repair
« Reply #14 on: July 25, 2017,02:08:39 »
http://tvrepairnavimumbai.com very minor problem.
« Last Edit: July 25, 2017,02:11:27 by panitesh »

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Re: LED stripe repair
« Reply #14 on: July 25, 2017,02:08:39 »

 

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