How To Test TV LED Back Lights Without A LED TESTER!
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- Опубліковано 29 січ 2019
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In this video I show you how to test your TV back lights without a LED light tester, using 3 (9 volt) batteries in sink, I'm able to get 27 volts and test my TV led back lights to see which lights are out or if a whole row is out. The TV in the video is a 47 inch LG TV and these LG TV's are known to have back light issues. Thanks for watching.
#LGTVFlickering #LGTVFIX #TipsNNtricks #DIY #LG - Навчання та стиль
Thank you so much for the tutorial ! Never thought of assembling 3 batteries together, saved me a few pennies ! Cheers !
Never to old to learn !!!! THKS. Gr. from Barcelona
Thank you so much, very helpful and so cost saving. Great work keep it up.
Thank God for people like you,sharing.
4:47 - Is there a reason you chose the center negative terminal on the led strip instead of the outside? I would think there is less of a chance to short out your power supply when using the two outside terminals. Are the two negative terminals not the same on each strip?
A little confusing following the path of current flow. How does the left and right sides get the flow? Are each row in series from left to right? If so, why doesnt the right side light up? Are they all shorted on the right side?
Thank you so much for your video. It really helped me out. I appreciate it.
Just replaced my first LED Backlight using your test method. Thanks for making this vid
Thank you for sharing this! ❤
Made my own 3volt tester out of two pencil batteries, one foot of speaker wire and two safety pins. But at 3volts you check each LED individually
Very good.Thanks!
This is great help..thank you and i love you
1:27 You mentioned a video about testing the power supply board. I tried to find it but could use some help, thanks.
Really helpful video, educational and clear, did for some reason make me think of Kermit the Frog. Actually made my day.
He does sound like Kermit
That 3 -9v for 27v tester...worked gr8 for my LC-50LB37IU...Thank you sir may I have another
Well, so much or LEDs lasting longer than florecent. Nice vid on troubleshooting!
Thanks alot. It worked for me
Smart, thanks!
What's the video called where you test the power inverter board?
Thx! It's video is very good!
So then if I wanted to use the old LED backlights out of our tv to use to light up different areas of my motorcycle off of it's 12 volt battery then I would probably need to wire some voltage reducers (I forget what they're called) inline depending on how many LEDs I'm running in order to keep them from burning out?
P.S. They are a nice shade of blue now, perfect for under lighting on our Glacier white pearl Harley-Davidson! Lol
Thank you real good help
Hello, Can anyone Tell Me if the White Paper that Goes over the Leds , if that gets wrinkles or a little issues but no holes. is it still good to go? Thanks
This is very useful! Great tutorial!
Glad the video could help:) Have a great weekend:)
I can't find the power supply board testing video on your channel even if I search through UA-cam with you channel name cn you post a link please
Hi! Where can i find your testing the tv power supply video? Plese send the link. Thank you.
hi , this is something i need to do but i was also told to check to see if the led power supply has gone. anyideas how to do this? thanks
I broke the 5 white clips holding down the white layer above the led strips. Can I get replacements? If so from where?
What are atleast operating voltage for lcds backlit ?
Bro. Thank you and subbed!
Love the homemade tester this is exactly what I was looking for
you all probably dont give a damn but does any of you know of a method to get back into an Instagram account??
I was stupid lost the account password. I would appreciate any tips you can give me.
@Jude Gary Instablaster :)
@Gus Jaxtyn thanks for your reply. I found the site through google and Im waiting for the hacking stuff atm.
Looks like it's gonna take quite some time so I will reply here later with my results.
@Gus Jaxtyn it did the trick and I finally got access to my account again. I am so happy!
Thanks so much you really help me out!
@Jude Gary You are welcome =)
You linked a multimeter but didn't use it in the video, what would you use it for ????
Hi, how do you know which voltage is for led?
Regarding why the some strips only light from one end: I appears that strips are not lighting from the end that has a shorted connector on them. Therefore when the battery is connected to the end with the shorted connector the battery current flows threw that connector and short out the battery. Notice that each row is made up of two 5 LED strips connected in the middle and that two rows are connected together in a series arrangement on the top half and that the bottom tow rows make up another series connected bank. When connecting to the strip opposite the shorting connector the 27 battery arrangement was being connected to a strip that lights up with a little over 14V. I am sure the current was being liited by the internal resistance of the battery in this case.
for all the labor involved in this. replacing all the led strip sound like a better idea. just sayin.
larry
hey dude. I opened my LG 32LB561V TV beacuse it wasnt working and the screen was always black. So i open it to backlights and half of the lights (the transparent plastic pieces glued on LEDs) were just loose and sliding around the case of tv. I have no idea how that happened but is there a way to fix that or do i have to try and order new backlights?
after replace backligth need to reformat or re program tv ?
I have Dell 5348 AIO whose inverter board is malfunctioning. I have a question about the 'Backlight connector PIN configuration', it has 4 pins, 2 middle pins for LED power and 2 corner pins for 'Channel 1 current feedback & Channel 2 current feedback'.
The channel pins have 5V power when the Backlight LEDs are on and non when there're off. These are not GND pins then where are the GND pins and what are the 'Channel 1 current feedback & Channel 2 current feedback'.
Kindly advise.
There is no GND pin , its DC , look at those like + and - in a pair , there is no current sens , that is done up the line i guess via resistor , its bad labeling its just + and - in a pair of 2 , i would bet
I have seen it soldered with a normal iron , relatively thick tip
Great video, is there any chance I could just replace the obvious burnt led strip? Also, is it safe to only reassemble part of the tv or even just to plug it in the wall and test the leds that way? Avoiding letting the back touch anything that is.
no it is not possible
I have a TV with identical leds that I would like to use to make a light panel. But I don't know how to power them. Would you have an idea ? I have five bars of 9 leds which is 135 volts
If you remove the tops of old 9 volt batteries, the connectors can be soldered to wire and used for the battery connections.
Excellent, thank you:)
you should never disassemble a battery. that is very dangerous
Brilliant hack
Hello , is 27volt for whole led light testing ?
Also as you said + for up
Negative middle only.
What if anybody use negative last
It would still just be 9v.
Awesome very Macgyver.
Thanks for making this video it is really helpful for understanding how the led display work and how to check.
But I have one doubt in testing voltage , as you stated first there are 9 led bulb and each are 2 to 3 volts then total votes required is max.27 volt but as I understand you applied 27volt on lesser led . Then why these are not got faulty due to access voltage across terminals?
Actually I need the support to repair my own led tv with 40inch screen
Letter A on chassis or letter B, means that the same strip letter must apply by the same order i guess? Thanκs for tutorial.
Where will I find the video on testing power supply board with a multimeter to determine if the power supply is shot also with the LED lights?
Nice, could a power for a laptop computer be strong enough (+-18v) ? or will the protection circuitry avoid it top send enough amps ? (sorry for my approx english !)
better keep the protection on contacts is not it ? (any sharp point will make contact I think)
i had a sony kdl-32r300B that would power on and quickly off again. i checked the led's and 3 of them where burnt out so i "time rich and resource poor" decided to scrap the leds of and solder the connection points together and it worked afterwards...
yes that was my intention as well , even came up with this idea of hooking up few battery , but my problem is that my STRIPS dont have soldering points on them
i cant do that , freaking thing doesnt have any points looks like ill have to scrap the defusers to come down to the joints where i can short circuit it .
I used this same battery arrangement to power 28vdc devices on aircraft which nearly all have a 28vdc power system along with 115vac 400hz too.
why not use a variable DC power supply?
@@Chevroletcelebrity We didn't have one. It was a rare situation that it was useful. We could have used the 28vdc battery on the aircraft but getting it out and bringing it to the location required would be more difficult than using the three 9v batteries. Also low current available from the three 9V was safer.
Do you know how to test capacitors? I mean without taking them off the board. But anyways, Excellent videos!! I never would have thought a few bad LED's would cause it to flash like that! You just saved me a lot of money trying out other parts. Definitely subscribed, and keep it up!!
You can't really test a capacitor without removing. If they're surface mount, you can check for a dead short though. Capacitors are often parallel with other capacitors and components so their capacitance can be affected by them if still in circuit
@@mixerfistit5522 Hey thanks! And yeah I figured you couldn't test without removing them, it just sucks having to remove them to test and re-solder, especially since I have a cheapo soldering iron, it was like $10 I think haha. Do you happen to know a good soldering iron that's not too expensive? I don't do a WHOLE lot of soldering but it's so much better with a good one, (this one doesn't get hot enough it seems and have to hold it on there for a long time, especially when de-soldering) but yeah this is pretty much just a hobby fixing TV's, been doing it for 10 years or so. I usually get TV's free on Facebook or when they have a free cleanup at the landfill, always a bunch of TV's there.
@@Josephthinleg I use a solder station that has a digital temp display and also an integrated heat gun which is great for components with multiple pins. I bought mine for about £60 a year ago, they all seem to be clones on ebay of more expensive models. If you look for solder stations you'll see what I mean. Mine has a variable power supply up to 15v and 2A which is handy for testing individual LEDs and little motors etc. They heat up really quick too. Sometimes I wish I had a psu up to 24V but the cost goes up a bit then so have a look around within your budget.
BTW if you're trying to desolder the LEDs on a TV you'll need to remove the strip first and either apply heat to the back of the strip or to the led carefully as most of the heat gets pulled away by the copper strip and you won't get anywhere
I tested all my strips and none worked... Then I tried to put my power source on the exterior minus sign of the strip and it worked so it seems not always you have to try with the minus sign in the middle
I sent my TV (LG 42LB65) to be fixed by an LG-certified repair center here in Egypt. The backlight strips were replaced, but instead of bright white spots, there are slightly dark spots, which can be noticed in video games with large bright uniform scenes. In other words, my problem was mitigated, not completely resolved. When I called the maintenance shop, they told me this is due to the fact that the components of my TV (especially the power supply) are old. I bought the TV, as far as I remember, on 2/2/2015, making the TV over 8 years old at the time of repairing (late May 2023).
The weird thing is that the sightly dark spots are there despite the backlight being very very bright. Moreover, on some contents colors seem to be "washed out"; too much pale color on the screen, especially UA-cam videos.
Several technicians I know tell me different things, but most notably that it might be an issue with the quality of the LED backlight strips. The strips I installed are not a genuine kit produced by LG, but a Chinese one. The repair shop told me that the genuine backlight kits are far more expensive and are not available; all those who claim to sell genuine Korean LED backlight strips are lying.
I need help, can this issue be 100% resolved? Can this issue persist due to the TV being old? I want to fix the issue 100% and have my TV like new again. Do you think someone here is lying to me?
Did the other technicians open the TV up and checked what LED stripes were actually replaced? Because this sounds like the first technicians just removed the faulty leds and kept the old stripes in. So basically you could have led stripes with the faulty LEDs missing on them. I did this to a TV of mine too. Found that two LEDs were faulty and just removed those from the strips and insted of putting a new LED on the stripe I bridged the contacts with a wire.
I shot my tv with a bb gun
One set of 4 9v battery costs $12 and a cheap LED tester is $18. Any way to just check it with an ohm metter? I won't have any use of the batteries or the tester afterwards.
If you have a dollar tree in your area they have packs of 2 - 9v for $1
Would bad LED lights cause discoloration on one side?
My vizio m55-c2 LED STRIPS goes off. When I unplug and plug it again it does the same thing. What problem could have happened?
Can I use a cordless drill batteri?
awesome that worked great thanks!
just tested all 14 strips, good news is they all work, bad news is they all work
… so why the hell is my backlighting so dim!? 😅 fml
How many batteries do I need if it’s a 55inch?
If just one LED is bad it makes the whole strip bad because these LED are set in series. If you go individually and find the bad one in the strip and change just that one the whole strip will function properly.
ok so if no continuity some led is opening the circuit ? thanks ( I do not see people testing the 2 white wires that send power to the backlight leds that is why I ask) thank you
Manu thanks
ayos.
So many of the notorious LG panel numbers end with "DUE" .. yep they are. The full power pulse when the TV first turns on doesn't help matters.
hey bro I have a 42inc lg I'm having that same problem
I just change the whole LED strips
And it didn’t fix my problem
Do you have any idea ?
Thanks in advance
The set up was confusing for me in regards to checking yeah strip , there were like 4 rows but In Each Row there were two strips which either I missed it or he didn't explained.. however I made my three 9volt battery tester and tried a Row ,I did scratch the thin Film on the negative and positive and nun of them Lit up... However when I do EACH LED individually they light up.. can anyone tell me what's going on here
And when I tested the TV originally it had a image on the screen just not the back light was lighting up the image to make it fully visible
didnt work for me. I tried placing the leads on the two spots at the start of the strip and nothing. I even placed them on the pins to the power connector for the leds on the power supply and nothing. finally I did place them on the points for single leds and blew a few out (overvoltaging I know). I also placed the leads on my nippies and it felt pretty good.
Now if I have a 9.6 volt charger can I use that?
any idea what kills the led? mine worked great till yesterday.
I made tea, came back and it was all black. testing shows 176v after power up then slowly drops. no light at all so the leds are shot, the wires show no resistance or anything rtu4300
If you keep ur TV on the brightest setting at all times this will burn out LED's
i have the same problem are they worth fixing my is a l g
if I wanted to light them all together from the cable that goes to the power supply, how man volt i need?
2.8 to 3 volts per light multiply by how many lights you have per row
I could be wrong.... but I feel like you were applying voltage to the wrong side of the strips. The fact that you got them to fully light up from the other side tells me that these strips likely zigzag down. Power going one way from one strip, the other way from the next row.
Every other strip needed power from the opposite side to light.
I noticed that as well. I wish he would have tested the right side of the first strip then i could fully believe him.
Use darning needles for probes then you don't have to scratch off lacquer
yeah
Cool
couldn't u use one of them volt wall plugs that has a switcher on it to use different volts?
who
I used my home made bench power supply , it has about 20+V , and when i test any strip it lights up but DIM , when i say DIM its dim , like barely visible dim , i didnt even see it first time
When i plug it in TV power supply , its also DIM , sometimes it even Flashes like when i just plug it in to Wall socket , it flashes constantly , when i turn it on it holds but dim again
There are 2 DEAD LEDs in those strips ,
I checked the power board , seams ok , i checked Mosfet for Back light power on the power board its ok , it works
So only thing ive found is 2 dead LEDs and Strips light up Dim, ive checked them separately like here , always DIM , i didnt expect to see them all DIM , that is why im unsure if it is the strips , how come they all died and went dim , i expected few working ones .
Cant check the diodes separately there is no point to hook em up ,if i dont break the difusers , do you guys susspect also that strips are dead ?
@@MS-hl4ds you didnt even read it , i didnt burn jack shit , the problem is in LED driver , doesnt work , you just trolling around arent you
Hey I got 36volt DC power supply and a ''lab'' psu with the 20 volt yellow? I haven't played with it in a long time. I'm thinking the 36 will probably blow it but do dim LEDs cause the power supply to shut off and on? Mine flashes ever 10 seconds
@@astrataway7077 you mean your TV led strips flash , count you leds , every led is 3V , so if you have 9 LED diodes on a strip, correct voltage is 27V , and you wont burn it up until 30V , thats how you know , but im suspecting your LED driver doesnt work just like mine ,check the output voltage on it , its probably busted , ive fixed mine but i have dead short on the board somewhere and cant find it .
What is the cost to replace these LED bulbs?
I used 2 nine volt batteries in series.and powered each strip.The strip of LEDs that didn't light told me it was bad.
THIS IS GREAT. My Insignia 50" went dark - not dead - after 17 months. Insignia diagnosed it over the phone because "they see this often." So it's a known failure they won't fix. Best Buy won't even give me an estimate to repair until I SPEND TWO HUNDRED DOLLARS on a "service contract." Be warned. Crooks.
What's the smart/safe method to drain any capacitor on the power supply before touching anything? It's never the part you're working on, it's the ones you're not paying attention to that bite you.
I did the flash light test and get the letters on the screen. I replace the backlights and powerboard and still nothing
ok now i have a 50 inch i have not exposed the led strips now the power supply with my meter tells me 68.5 on led strip 1 and 68.5 strip 2.I only have 2 strips
👏👏👏👏
Super
can i use an old AC/DC charger?
Yeah definitely if its the right voltage
Could a 20v battery be used?
I'm about to find out. Was just thinking that...
My Samsung 55 in led I had some
These days so many people are throwing away TVs with cracked screens you can get light strips from them. I got so many fixed TVs I don't know what to do with them. I figure 100 dollars for a 50 inch is fair.
So if one row has 16 lights I would need 6 batteries?
New friend Goodluck and GODBLESS
Bussy on voltage lcd led checks
you only tested half of the row (4 lights vs 9 lights). 4 * 3.3V = 12V. yet your tester was 27V. Kinda confusing. I'm lost as to why the whole row did not light up. if you had made the math 4 *3 or 5*3 then I'd be less lost.
If you tested the row in the half that half would be to fused and break
the maths are right but the info is wrong. see reply above.
27 volts applied to 5 LEDs in a series circuit is to much voltage, In the past I've damaged LEDs by over voltage,
Where is this video your talking about in the entire video for checking backlight power with a multi-meter on the power board. Hidden among your amazon list and social media.
are led back light testers safe..can they give an electric shock
You will get a shock but it's very low current.
Why does it only light up one side
there are two sections...separate left and right that are isolated from each other. They use 6v leds not 3v so will illuminate with 24-30v
If one light is out will the whole tv be out???
Depends on brand LG it will lite
my 60 inch 3D LG TV having some back light bulb died , causing a corner having dark shadow.
so bad the LG quality!!!!!!!!!!!!!
I took apart 3 of these tvs, all cracked screen. These LG tvs uses 6v leds, so...retest from the middle 24v for 4 led strips and 30v for 5 led strips. Then test each one with a 6v power source. These strips are harder to test because they do not have test points between the leds so you need to make your own by scratching the white protective layer off. This guy fixed the same tv ua-cam.com/video/Q46Y7HZW9ck/v-deo.html
Hello, just a small question : if I have no continuity on the 2 wires that send the power to the leds (from alim board) I guess it confirms they or some are dead is not it ? When I use the ohmmeter on the new led strips, I have a reading) Thank you if somebody can answer me
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