Mulja tv repair portal

Equipment Repairs => LCD TV forum => Topic started by: mulja on January 19, 2016,16:14:56

Title: LED stripe repair
Post by: mulja 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
Title: Re: LED stripe repair
Post by: mulja on January 19, 2016,16:20:29: More pictures :)
Title: Re: LED stripe repair
Post by: downunder on January 20, 2016,02:39:44: Hi Mulga,

That's an excellent pictorial. Thanks for sharing.

Bruce
Title: Re: LED stripe repair
Post by: thoma 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
Title: Re: LED stripe repair
Post by: mulja on January 20, 2016,08:10:40: My power supply is with adjustable voltage

for LED i put 3 volt
Title: Re: LED stripe repair
Post by: thoma on January 20, 2016,10:55:08: I mean your variable power supply!
3V Thank you very much!
thoma!
https://www.youtube.com/watch?v=Bf5T2wwtydY
https://www.youtube.com/watch?v=hh3z_dkkcUM
https://www.youtube.com/watch?v=8otPjsN8jD8
Title: Re: LED stripe repair
Post by: Turnip 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.
Title: Re: LED stripe repair
Post by: thoma on January 24, 2016,07:25:36: http://www.sahy.cz/sahy/eshop/0/3/5/2842-2835-3528

http://www.sahy.cz/sahy/eshop/0/3/5/2217-LUMENS-D2GE-550SCA
Title: Re: LED stripe repair
Post by: thoma on February 15, 2016,08:11:37: http://www.chsinteractive.co.uk/electrical-components/tv-entertainment/tv-spares/led-strips-bars.html led stripes
Title: Re: LED stripe repair
Post by: Κώστας 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
Title: Re: LED stripe repair
Post by: thoma on May 04, 2016,15:03:03: http://www.onsemi.com/pub_link/Collateral/TND353-D.PDF

http://www.mouser.com/pdfDocs/STMicro_LCD_BACKLIGHT_A.pdf

http://www.skyworksinc.com/uploads/documents/202380A.pdf
Title: Re: LED stripe repair
Post by: bonesy 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.
Title: Re: LED stripe repair
Post by: ahd540 on May 13, 2017,10:15:57: merci bien mon ami
Title: Re: LED stripe repair
Post by: vinceroger69 on May 16, 2017,11:21:17: Quote from: bonesy 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.

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
Title: Re: LED stripe repair
Post by: panitesh on July 25, 2017,02:08:39: http://tvrepairnavimumbai.com (http://tvrepairnavimumbai.com) very minor problem.
Title: Re: LED stripe repair
Post by: PROMAN28 on August 23, 2017,09:24:55: hi fellow techs i have been selling these flip leds past 2 years (first tech to do so ;) ) i supply quick instructions with my led kits, to trade, and on top they so easy to change rather then cut pieces of old led strips , anyon needs hints o tips let me know :)
Title: Re: LED stripe repair
Post by: Davy on February 06, 2020,08:52:44: Further to my recent escapade with a LG backlight I played around with a LED strip tester circuit I found on the internet, works from 6V up to at least 12V, it has current limiting and a 3V DC out as well as the HV. Works a treat, I designed it for 'through hole' standard components on a 1.6 x 2.6" pcb. Planning of adding a El' Cheapo' LCD dual volt ammeter and running it from rechargeable.

Lol, the darn thing I thought wasn't working until I grabbed the output terminal... this was on a 6V supply, a connection to the LED strip came off - I soon let go of the 175 V lead!

I'll be happy to share the layout and tracking ready for printing if any one is interested. This ought save a lot of hassle with tripping tellies.

Dave
Title: Re: LED stripe repair
Post by: arslanshanu on July 12, 2021,09:59:42: I think TV Backlight That Changes With Picture is a great kitchen tool. It's been fun watching TV ever since I put it on.

https://www.kitchenappliancepackages.com/2020/12/Best-TV-Backlight-That-Changes-With-Picture.html