how to test LED strips without tester Using a battery. backlight tester DIY
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- Опубликовано: 1 янв 2018
- If you want the tool to test this, its on amazon cheap! amzn.to/31GrjUc
Here's to those that don't want to invest in a led tester. Still works just as good. Message me for questions.
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repaired a free 4k 55" toshiba with this man, thank you so much
Thank you for all of your vids. I'm on my 5th TV fixing. Found them all in the garbage. Selling them on craigslist. Making a small profit and helping the environment, even if it's a little bit.
That's awesome! Keep it going!
Super creative, quick-and-dirty solution! Love it! Definitely gonna try this out with TV I found.
Hell is this a cool solution!
I salute you, you saved my day!
Instead of buying a power supply for 100 bucks or paying a professional I just checked the screen backlight with literally zero effort in no time.
Thank you!
Thanks!
Great video! I was considering to buy a tester with priority shipping but this will definitely save time and money to fix an old Vizio TV with backlight problems. I’ll still get the tester but it can get here whenever, now. Thanks for the bonus trick with the bridged LED solder. Considering I am fixing an old TV, I rather spend towards a new one once this one is not worth fixing anymore.
Very nice DYI tester, tested all of my strips found the problem very fast, thank you. :)
Nice tip!!! Bout to use this method right now, so it looks like all the fire alarms in my house are gonna be without batteries because that is the only place I can think of these kind of batteries on hand lol
Great video man! I'm an electronics technician myself and that's a great solution to apply the necessary voltage with "low current" to test the led strips! I'm actually getting ready to troubleshoot a Samsumg Smart TV that has a brightness issue and this a great video if you don't have a variable power supply or led tester. So, thanks for posting this video man! God bless.
Thanks chris, for the comment. let me know if you need any help. BTW what model number do you have?
@@TECHIELIFE Yeah absolutely! It's a Samsung UN40EH5300. I've also got a cool idea for you if you ever need it. I've used a 9v battery before with a set of alligator clips as a long range continuity tester. You just clip the two sets in half, solder or wrap two leads to the battery and get a small DC piezoelectric buzzer and solder or wrap the other two leads to that. Boom. Instant long range continuity tester!
@@MrCcarter7 neat idea.
@@TECHIELIFE Yeah I used to work at a tv station and multimeter leads just weren't long enough when running and terminating audio wire from one room to another.
I told you that you was a genius!! The battery method worked!! You da man!!
khumello glad to see you got it.
Thanks very helpful tip with the 9 volt batteries and the very clear explanation, my cheap Samsung led tv went out yesterday and with the help of RUclips I'm trying to fix it, if only something to do, and the video just saved me so money 💰 😀
This is hella useful. In-laws gave us their old obscenely large Sony tv because the screen has gone purple. Figure I need to replace the LEDs.
great idea..i just used a 12v ac adapter and strip the end off and it works fine for doing 1 strip at a time and just do each strip ...i like your 9v method too....i also do what you did by jumpering the bad led..it wont really matter..you wouldnt notice it...
Thanks for this. Tip worked well. We actually had two led out on one strip.
Well done.
I love battery sequence I never thought of connecting them that way
Great idea and thanks. I used a pair of AA's and some really sharp probes to test one led at a time. Finds the problem child each time.
Great trick, my first strip is completely burned out, and the rest are connected in series behind it, so no backlight. I think I must have the 6v lights in my LG, I needed ~50v to get them to light.
This was VERY helpful! Thank you!
Thks for the tip with using the batteries worked a treat 👌
I was thinking of this but didn't put enough batteries together... I could not find any info on the web about the voltage.. but you came thru... I'm a scrapper, i'll use these in my camper now.. they are too cool! thank you !!!
Awesome glad I could help!.
Love the 9v battery stacking trick, the MacGyver is strong in you. :-)
i dont mean to be off topic but does any of you know of a way to log back into an instagram account?
I somehow forgot my login password. I love any help you can offer me.
@Nikolai Maximus Instablaster =)
Very cool. Thanks for the vid!
Thank you for all the help and time..
Fantastic video. I have a very similar LG that I will be opening up next weekend. Tried a repair on a Samsung glass screened LCD some time ago but made me sick how stubborn the holdings of Samsung were. LG seems easier to strip down to expose the LEDs. I will be trying your battery trick for sure.
Did it work for you?
@@j.lietka9406 yes, worked perfectly. Total cost of repair (batteries, replacement LEDs) $15
@@RogueLegend999 very good!! Thank you for your reply! 🤓
Ok I have a Vizio model E470i-A0. Looks to be the same one you're working on. The led connection port has 4 test points the they are as followed. Led1-, Led1+, Led2- and Led2+. At each positive Led1+ and 2+ I am only getting a voltage of exactly 68v does that mean the power supply board needs replaced? I did the flashlight test there is an image and sound but no backlight. I dont want to go any further by testing each strip yet. Please let me know as soon as possible thank you.
Thanks for a very informative video.
Very informative, thanks!
It definitely helped. Thanks
Thanks u you've teach me something today i wanted to knw along time now.
the battery trick is brilliant
Good idea. I used an 18v cordless drill battery on my 55 inch Hitachi 10 LED strip (they come apart into 2 strips, I tested half a strip, 5, at a time) and it worked great. I found out I have 2 left side strips that are out. Found some on eBay for $12 each. Not spending $70 on replacing every LED. This video saved me a lot of money, and/or saved my TV from the landfill.
thanks a lot for the info. yes you could have wasted more money, but good thing you had the knowledge to fix it. Thanks for watching!
Would there be no worry here that the 18v might fry some of the working strips since they require 15v or is the 3v fairly negligible there? I'm having the same problem and only have an 18v cordless drill battery to hand.
Adam Lane i wouldn't go no more than 3.5 volts for each LED.. and only test really fast dont leave the battery touching very long. now some leds may actually be able to run 6v each.. but by then, you will see that it will be dim when you test it out.
@@TECHIELIFE Do You Think I could use a 20 Volt drill battery to test My LEDs right where the LEDs plug into the power board, to see if my LED's/back-light are working? After unplugging the board of course. How Many Mh do you think the Drill battery is? I don't have any resistors to add in the circuit.
@@mrbreezeet1 at 20v..i woulddnt go any less than 7 leds anything below that could damage it. typically a full charged battery cand range a bit over 20V so if you get 21V divide by 3V needed for each led, it gives you 7. you can do 8 and more, but it will get dimmer.
Excellent work bro
Thank You
Can I use the three battery set up to test it right where the LEDs plug into the power board, to see if my LED's/back-light are working? After unplugging the board of course. How Many Mh do you think that is? I just don't want to Fry my LED's if they are good. I take it a 20 volt Drill battery is too many Mh's correct?
Quick easy question? I got two brand new power supplies and led output for the backlight is 130v roughly on led pair 1 and 0vokts on led pair two off these boards. Am I correct in assuming these parts I bought are bad? It mentions 89v on #4 on the voltage tag on the board. So I my mind these are defective. It does it without led connected and without motherboard connected and I have tryed with it hooked up...
40L310U Toshiba LED i just picked up lights up for about 30 seconds until it gives out. When I flash the light I still get picture just fine. Would I even need to pull it apart if all the LEDS seem to work - if only temporarily?
Great tip and info 👍
Nice video, thanks for the heads up
Superb idea .thankyou has helped loads.
Awesome job! I had watched 4 videos before yours and yours was better than all 4 Combined
Thanks for the feedback!
Hi i have a 48 tv and i want to test the led. My tv has 11 led at the row how many battery i need? Thanks
Just wanted to say thank you for this video. It verified my theory for testing the LEDs in my LG 55LB5900-UV.
Mike Oleksa sure thing
Great tip. Made my night. Thx!
lol.. never heard that before but thanks!
This method might work, but I would not recommend it. If you want to use a battery to check LEDs, use two AA, C, or D batteries instead of a 9-volt triple pack. With the 27 volts that are produced with three 9-volt batteries, if the string you are testing has only 5 good LEDs working, you will be supplying them with nearly twice the required voltage, which will blow them out. If you use two AA batteries in series, you will have a 3-volt tester, and you can check each 3.2 volt LED at a time, without fear of blowing the LED.
The BEST method of testing LEDs is with the variable voltage LED tester that is sold EVERYWHERE. Made in China, and you can find them from about $20 to $60. I got mine from Amazon for $23 including tax. It will check a single LED or an entire string of up to 100. It varies the voltage as required.
You know your stuff. Very nice. Thanks for sharing your knowledge.
very informative video. Thanks!!!
thanks for watching!
Thanks man I like that little trick with the batteries
Very nice job . We have this kind of led strips tester .
Works wonders.
very good video, thanks.
Thanks for the tip
could I possibly use a buck converter? I have 8 led per row and a hp printer power (internal )supply is 29.v Ive ran my sound bar and other thing off it. there $3.00 e-bay.. thanks
You can also use your phone charger + usb to test them , basically cut the usb cable you'll have 4 wires use the black and red as positive and negative. And job done
@Sam S I don’t understand the point you’re making on how it’s a bad idea to do this. How are they fundamentally different at all, it seems like the same thing to me? It kinda seems like your point is, that it would be bad if, while you were connecting the wires to the backlights, the voltage happened the vary. But you say yourself that the voltage is constant, and the phone itself regulates it, so without the phone in the picture there would be no need to worry about the voltage varying
you are pretty good i but i would recommend putting the smartphone on a tripod so we dont get our heads spinngin by the constant moving of the phonej. but what an awesome idea
Thank you you rock!! I wasted 2 days on this T.V ! So thanks alot !
Thanks,, just the info that i needed... Groetjes uit Holland..
Thanks for the comment!
Awesome thank you 👍
Hi, let me know total led how many ohms between B+ to ground....? please give your feedback...thank you
Thank you so much for this. It worked for me. The middle led strip in my Samsung tv isn't lighting up. This has saved me so much money because now I don't have to buy a new tv 😁.
Good luck on fixing it. Please subscribe!
Hi I have question what is the voltage in your board coz mind only 79.5 volt so its ment my led are dead hehehe thanks waiting for your response
thanks for sharing, really saved me $$$$.
Glad to hear that!
Thank you!😊
What is the meaning of one strip says R1 and follows the other strip that says L1. What is the deal with that. Can one unhook say the L1 and light up the R1 or just cut off some of them ( being hooked up in series, probably not) to shorter the strip just for the purpose of sticking them somewhere and use them for fun? Dang I didn't realize that you have supply them with so much voltage.
Thanks a lot!!
I don’t have 3 batteries I’d there any other options ?
Excellent video!
thanks
thank you, good to know
Worked for me thanks
I want to buy a led back light tester but there isn't a UK version with a UK outlet... I gotta try this
Hey, I got my panel apart and I'm confused, when I check each led with my multimeter they are ALL showing open. I know this would be very very unlikely but they are. It feels like I'm doing something wrong but I'm testing each one like a diode.
Your Idea has work out.Thank you brother. God bless you.
good work
Very informative broham thankx for the tech knowledge...wanna fix my girlfriend's lg 50 inch got it stripped down to the backlights but couldn't figure out how to test for the bad led but now .....good head is coming my way....lmao..stay blessed man
The things we do to keep a good head between the legs and pelvis 👌👌
my master samsung ue40h 6270 led 5 row led bar 4 row led bar if it works fifth or not, we can get the image.
My sony 55 is super dim. I'm guessing it needs some replaced. Will this process work for the sony
Depends on the model, but yes it should
if the orignal LED is 3v is buying a replacement 6v ideal, so that the LED wont reach the max power and burn out, its just a question
No, you want another 3v.. if you purchase a 6v, the other leds will become very dimmer and that one led will be brighter.
Tnk, for the help, just one question, my led strips are made with 14 leds, could work with 9x3 battery or I need to increase the number of the batteries? Tv Samsung ue55ju6800. Tnk in advance.
Let's just say, under voltage is safer than over voltage.. these leds will be damaged if you go over
So when you had the camera close to the led strip to show where to make the connections did the entire strip light up all the way across?
my 60" is only lighting one strip and not the one connected to it.
but if I test each strip individually all led's work .
Heres the deal, when I plug in the tv the back lights continuously blink in sequence with the stby. light until unplugged, it will not show a picture or turn off.
All but the bottom strips blink.
When I disconnect the back light plug from the power supply the tv turns on, stays on and turns off correctly.
What is the model of your TV?
Great Stuff👍.
Thanks man! Had my Hisense go out and found a blown strip. DONE. Wanted to test them all instead of just that one to be safe.
Thanks for watching. I'm glad it helped out.
@@TECHIELIFE did it last night. Worked perfectly!
well done. now just replace and should be back up. just remember to lower the brightness a bit this time.. Thanks for watching and please subscribe.
Amazing video very impressive just had a quick question so if I do this I can touch and test any of the LEDs one at a time? Anywhere on the board except for the middle connectors? Because the middle connectors will send voltage to the entire strip? But if you touch one 3 volt with the 27 volt wouldnt that blow the single led as well? I want to try this on mine ASAP because I'm waiting for LEDs to come in the mail so if you could find the time to get back to me that would be great thank you
Yeah , do not try on a single led. It will damage the led.
Hi,
Can I change the interface menu 1530 by Samsung UE48J5600AW, with another software 1290 for exemple?
Greetings Sire!
so i have samsung un60j6200af and it has two seperate led wires one set grey/black and anouther grey/black when i use the 9v battery test it lit one of them but other set of wires nothing happen.. so im hoping even though its a job its just the leds.. shopjimmy has kit with suction cups for 12strips 100$
Hello, My remote control for a Samsung TV Model # UN50H5203AFXZA stopped working, so I changed the batteries, tried a brand new remote, and then used the jog switch to manually turn on and off the TV. I accidentally, locked the panel key and now I can NOT use the jog switch to control the TV. Is there a way to unlock the TV and reset it without using a remote? TV is only 3.5 years old and I lost my job so I am trying to fix this by myself-Thanks
Hi.....how did u bead or solder the strip where there is missing LED. I live in small town where no TV parts are sold and my TV display went black today only sound. Luckily i have an old tube TV to go on with my life lol. Gona be a while before i can get a replacement strip
Place a small piece of copper. And it should bridge it
@@TECHIELIFE thanks will try that today
Thanks for sharing this video, I replaced the led bulb and all the leds were working, when i put the led strip back, As soon i connected the led connector same led bulb blow again. Do u think something wrong with power supply? Can u kindly help me with this. Thank u.
checl to see if there is a short there... but most likeley its the led.. leds dont blow unless its over driven.. try lowering your brightness.
Fantastic, can in ask, i have only 8 led in my strips, is 27v to much? Would using less like 12v still light them up but more faint? As in enough to know which led is not working?
I would only use about 20v
@@TECHIELIFE Would 18v work as in 2 of those 9v batts or would 18 not be enough to light them?
When you applied the 3 x 9V tester, did the rest of the LEDs on that strip also light up? Thank you 🤓
Well it depends on the tv. If the LEDs are in connected to the rest of the LEDs, then it should turn then on.
Do u have a video that shows how to bypass a bad led light? And what did u use to jump the light you removed?
algonzalez571 yes. I do. Look for funai black Friday TV on my videos.
I got a Sharp 50’ and the backlight stopped working.(I still have sound and did that flashlight test) I ordered a T-Con board to see if that was the problem but there’s still no backlight. What do you think is the problem. Power supply maybe?
depends on the model number. in many many cases, the LEDS tend to give out before the power supply does, unless it is struck by lightning or a power surge. of courser replacing the power supply is easier than the leds, but if you want to be for sure, you need to measure voltage coming out of the power board.
Hey man, this video really helped me to better understand what should I do, but can you help me which one should I buy for my LG 32LA620S-ZA ? 3 or 6 volts?
Hmm. I'm not sure.. depends if it lights up with 3 volts. Amd if it comes on full brightness. If it doesn't, then it probably a 6 volt. I will be doing a video later on today on how to test it.
How do you know which LEDs to get for your TV? I can't find the strips for my TV anywhere so I was planning on replacing the individual LEDs but I have no idea how to find the correct voltage or color for my TV. Are they all 3v LEDs?
ruclips.net/video/YgaL6X6eSaU/видео.htmlm40s
That video just shows how you can get the strips and how you can test them for broken LEDs. It doesn't dive into how to test what an individual LED uses for power, what type of LED it is, or how to determine the correct color LED to get. I have an Element TV (ELEFT502). If you guys can help me out that'd be great!
So I could use a little "wall bug" switching power supply of around 30VDC to do this, right? Or, would the voltage be too un-filtered/un-smoothed?
I don't think it needs to be filtered. The lights will get brighter as more voltage is introduced.
@@TECHIELIFE Cool. I managed to test my LED strips using a transformer from a toy railroad set.
To save some frustration, start at 2:33
Just been stripping ours down if goes well will e my third tv repair success plus 1 that's an almost fix (sound plus tv comes on (didnt before ) but still no pic ) first fix was a 37inch samsung lcd and being used as I type lol which only needed capacitors (£5) anyway almost to the nitty gritty of getting to lcd's (these ove not yet ever done ) I have a supplier who has them but there are 2 arrays so need to check which ones are needed it's a Phillip's 49put4900 model there was a an upper and lower dark patch that was only noticable on certain dark screen picture I have no lcd tester have u a link for your tester ? Are the cheap £10 ones on ebay any good ? And did u test the side ones that you mentioned? Thanks good video
I have a link on the description of the video
@@TECHIELIFE my bad I'll take a look mate thanks
Question. If I wanted to test half of my led light without taking tv apart. Could I use a car or marine battery to check from back side of tv where it plugs into the power supply? Car battery being 12 volt and marine maybe 24. Or somehow would it pull to many amps and blow them? Thanks
It's not the amps that blows them. It's the high voltage. I would just start with 12 volts. Then work your way up
@@TECHIELIFE so in all reality a car battery would work?
Yes it could.
I have a 60” Lg the picture goes out sometimes but I still have sound what could be the problem?
Most likely the LEDs. What's the model number
On that quick fix, do you have a video on how to identify what to bead together?
Luis V I think on one of my first videos.. I think it's named funai Black Friday tv fix
ty so much
sony flat screen backlight on but no picture sound ok tcom on the main board replace the main board still no picture help
What model.. sounds like either a bad lcd or just need to do a firmware update... Sony is weird like that
My TCL 65S401 went dark last night. The sound and picture are there (flashlight test). Would all of the LEDs go out at once or would it more likely be the power board?
My TCL C2 65" went black last night too, I think the new update is messing up something on board, because 2 more of my friends had the same problem few days ago. Thankfully its in warranty so its going tomorrow for repair.
just lower the brightness down on the leds.
Hey bro, the warranty repair guy was at my place and while he was probing the 4pin connector (on the power board where the LED plugs into) and while he was in amperage mode on his multimeter the backlight came on. I'm waiting until i find out what haier is going to do for warranty until i dive further into it. I just want to know is it normal if a LED strip is open would probing the 4 pin plug in amperage settings would triggering the backlight to come on??? Any advice you can give would be awesome.
usually the leds dont open. they usually short. but almost any tv will shut down or wont pass voltage if too much draw or not enough is given. in some cases, leds will create an open and will not complete the circuit.
TECHIE LIFE thanks fur the fast reply. i got a haier 55 curve screen (55ufc2500) with no backlight. Last week it failed fur the first time and when i turned it off and back on it was fine but 2 days ago i turned it on and it came on for 1 sec and flickered a couple times and stayed off. I got voltage at the connector (300 volt). The thing that confused me was when the warranty guy came to do a diagnosis he was probing at the connector (in amperage setting) and the backlight came on when he tested across 2 of the 4 pin connector. I just can't help but feel because it was under warranty the service guy just submitted a diagnosis that would have haier replace rather then repair. The tv's 4 months old and would be a shame to thro out. It's the whole being able to trigger the backlight to come on from the connector that just really confuses me. I'm fairly technically inclined person (I'm a auto mechanic but grew up my entire life around electronics in my dads tv repair shop) would you be able to trigger the light to come on via the 4 pin connector plug if there was a problem with the actual LEDs??
S. D. hey, I'm no expert, but it appears that your leds are fine and that the tech triggered something on the board that drives the leds... perhaps something in an IC or theoretically, something as simple as circumventing a cold solder joint, bad cap or maybe diode. Tough to diagnose without a scope, but then again, the technicians are trained where to look! Did you ever get it fixed?
Nice
Thanks. I understand the bridging one LED from an electrical perspective but wouldnt that afect the light distribution in the TV and therefore the image? If replacing the LED, even if not the same, would you be able to find similar replacements?
Yes you are correct. But in some cases it may not make a huge difference. For say like a corner led. Or in some cases, the LED strip may cost upwards of above 50 bucks per strip.. then in that case (and last case scenario) you would bridge the led.