How to check TV LED backlight strips with a multimeter. LG 60LB7100 with intermittent backlight.
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- čas přidán 14. 09. 2021
- We have an LG Television model 60lb7100 that comes on for approximately 10-15 seconds then the picture or backlight goes out and you still have the sound. If we place a flashlight up to the screen we can see an image meaning we have a backlight problem.
If we use a backlight tester to test the strips, then all the strips may light up. However there still may be one leaky led that's causing the TV's backlight to turn off, thus causing a black screen.
This particular troubleshooting method in which we use a multimeter to check the return lines DC voltage can be used on any model television.
bigdogelectronics.us/collecti... - Jak na to + styl
That explains why my tv would work for a while then go to black screen. I'd turn the set off and back on and it would work for a while and go back to black screen. Then it worked fine for about a week then back to black screen for good. With your tutorials im changing all the backlights, tv is about 7 years old so figured i might as well before others go bad. Thank you very much.
I enjoy your videos , Remember the good old days of Crt's , Dlp's and Plasma repair? We've gone from being TV technicians to Backlight technicians . Keep up the good work.
I do not have an LED tester so to know that i can still check the LED strips without one is so helpful. Great job!
Great video, love your clean and tidy workshop,
Dave from UK.
Thank you for sharing this valuable information. I appreciate that you break down / explain each step so thoroughly while showing multimeter readings as you go. Well spoken , clear and precise...you're an excellent teacher bigdog. ✌
Your knowledge is very impressive, thank you to share !
If you were in the AV club at my school I totally would have joined. Great video, I got a free LG tv and need to see if it’s worth fixing
Good to see you back BD miss your vids mate I still hear that canary you have in the workshop chirp ...........chirp.......chirp 🐥
I have a TV with the same problem. I like how you hold the connector with the adjustable wrench.
Very informative Teacher..
excellent and informative
😂😂😂 The man can strip electronics apart, diagnose and repair them... But that pesky fire alarm has his number!!! 😂😂😂
Nice video, is it the same procedure with edge lit backlights as there is only two strips I believe one on each side vertically? Go safe, many thanks.
Hi output Voltage for LEd backlight is 45v.. is't normal? Because my problem is. LED not turn on.
I can't find led strips to fit my 40" Toshiba tv. Will other brand strips work?
Hi, just like you I measure the DC volts at the LED+ point and it shows 230 volts... so something is wrong with the board? should I keep changing the led strips? my tv is LG 32" thank you very much!!
If u can see an image with a flashlight, then Yes change the bl strips.
Great video and very well explained. By the way, you have a beautiful workshop there. Enviable!
Please allow me to give you some advice: when troubleshooting on live systems, avoid using jewelry. That necklace around your neck may kill you one of these days and we would hate to be without our favorite teacher, eh,eh.
Great job!
Just wondering- how much complexity does local dimming add to backlight repairs? Or does local dimming EXTEND the average backlight lifespan?
Its just a circuit that dims certain backlight sections according to dark scenes in the picture.
Hi what is that tester called/make ?
Ok question I have is what if when ur testing the black wire and your not getting the right voltage it's pretty low voltage what well that nean
I would like to see part 2 of the repair if you found the leaky led or replaced the strips
Editing it as we speak, should be uploaded later today or tomorrow. Thanks!
@@bigdog8882 thank you looking forward to it. Also have you repaired any led Toshiba Chromecast tv's? I having the same issue as this tv on your video but it comes on and shows Toshiba Chromecast logo then shuts off. I pulled the screen and tested the LEDs strips and they all light up.
@@rm4213 Look at the sticker on the back; whats the model# and manufacture date?
good
I just got a 75" Hisense TV, half the back lights are dead, can you fool the CC driver with a resistor to make the TV come on, I would like to know if everything else works. I can calculate the resistance on the good side with the tester. Volts/current
Did you ever figure this out? I have the same TV I'm trying to power the back lights only do you have any input?
@@TheSaltyEgo You would need a very large wattage resistor, wattage is the limiting factor. So I made up a backlight set pulled from another TV to simulate the load, it has to match the test TV close enough not to trigger a shutdown, its gets tricky when you have multiple lines like Vizios have. I suppose you could make up a few sets for different TVs, I abandoned that idea for now. Maybe a way to intercept the shutdown signal, I assume it come from the chopper IC. I think its mainly over current that triggers a shutdown, so if you disconnect the lights you should see an image with a flashlight.
Will I do still have the old circuit board and equipment for this tv. The screen was just cracked I wanted to save the LED panels for a backlight I didn't think it would be that complicated just to turn them on though
Anyway to reset the software on these ? Mine does the same thing but you can't see anything , I did a settings reset now it just boots and goes black. Anyway to reset the software ?
A bad led is a hardware issue. It needs replaced
I have a 65 inch Hisense TV. It won't turn on and the red light is just flashing. I replaced both the power board and the main board. Is it possible that I have a bad LED strip or strips? I have no backlight
You might just be better off buying a different tv at that point. That brand is the cheapy Walmart kind anyway. Not like it’s a top or the line LG or Samsung worth repairing
You’ll spend more in replacement parts replacing all the internal modules and lighting
LoL let see the flux is going on!! Thumbs up!!
SIR PLeASe HELP ME.
I have 65 inch flat t.v. I removed circuit boards. Just 4 wires coming from LEDs. How do I power them all? What voltage should I use? Would a 20 Volt power tool battery work?
What is the ground wire Between blue white red black?
Please help.. my wife pissed about this TV sitting here. I wanna impress 😂
Mackoy Tech Ph is watching.
Glycerin is also watching
63v do you not mean 6.3v
“What the flux is goin’ on!”
Leaky LED? What does that mean. It's solid state. It either works or doesn't work. Once they fail they shouldn't come back.
So why does my tv work sometimes others, has all the symptoms of a bad LED.
Backlight LED is just a "Diode". It can be leaky also and change value or resistance too, just like a diode.
So I took the Tv apart, the problem was the connection between the two strips of LEDs. The LED brightness would change upon touch of that connection. I unscrewed then put back in place. The screw nearest the connection had to be tightened first..Anyway I fixed that...But put everything back, and now I get nothing. Just a blue standby LED. I slightly cracked the screen upon disassembly. (I did not use suction cups).
Lesson learned...no shortcuts..
Anyway thanks for the knowledge.
I had to turn this video off. I can't stand that smoke alarm beeping
change your batteries .
Your about 3 years too late, but thanks for reminding me though.
All that 17 min video and a lot of talking not a lot of info. So confusing.