LG47 TV repair - backlight flashing/OFF issue (47LB5610) 

here they ask 200$ problem is i was not sure if it's the led's could have replaced myself. Since it is plug and play. Now if i see flickering i'll know i can buy 1 kit, that is 8 strips of lights for a 47 inch with 30$.

he did that and it created a bight spot, on the other one he just put a single 3v in and it worked better, entire brightness down by a little. each led losing a miniscule amount of brightness, but at least its even doing it that way. i admit if it were me i would have done the two 3v in parallel to match 6v too though..

Aoyue est très bon niveau station de soudage CMS, surtout celle avec pane et corps chauffant céramique intégré. Oui, c'est des copie de Bakku, mais pour m'en servir depuis plus de 10 ans, je t'assure que c'est très bon et très solide. J'ai essayé de la station Weller spécial CMS, c'est de la merde à coté. Ca chauffe pas sur de la pane crayon ou biseau de 0.1... Aucun soucis pour faire du recyclage de led CMS de 0.3 mm de large par exemple et pour dessouder à 180°, voir 160° seulement. Ce qui est super pour de la LED. Avec du Weller qui date des années 1970 en conception, tu peux éventuellement t'en servir en pied de biche à coté. EN plus, ca chauffe en 5 secondes, fer éteint au préalable.... 20 euros la pane... Çà pique. Mais, étrangement, comparé à du Weller, bha...Les panes ne s'usent pas, même avec de la soudure enrichie en plomb. C'est ce modèle de pane là et c'est 20$ pièce. Soit 160 euros le kit qui suit. www.alibaba.com/product-detail/Soldering-Station-Tips-AOYUE-Lead-Free_2001439072.html C'est loin d’être du low cost! Pour ce modèle, en tous cas. J'en ai testé un paquet et c'est toute de la merde à coté de ça. Sauf Bakku, comme dit plus haut.

1) For the 4 led strip, 6 volts per led, in total 24 volts for the 4 led strip, for the 5 led strip, 6 volts per led, in total 30 volts for the 5 led strip 2) He soldered the led individualy, he didn't replace the whole strip 3) If you have the tools to solder, then its cheaper to replace the led, but if you don't have the tools to solder, buying the strip will be cheaper.

I checked on aliexpress for replacement parts and found there are 2 models for these kind of TV, 3V and 6V. Then I tested to power one LED first with 3V, which did nothing, then I used 6V. That's how I figured that out

@@pierreboyer9277 awesome, thank you for the information! :-)

Then it's probably the backlight that is having a issue. Note it can also be the backlight power supply, not necessarilly the LEDs themself

So I don’t really know anything about TVs how do I fix that

Yes there is an electric shock hazard with the power supply board. The capacitors can hold power for a long time. I tell about it in the video by the way.

24v

Same problem happening with my Lg led screen. Did u got solution?

same problem i am worked today. what I find is when i checked output voltage from power board, it waa ok. Also right sides of backlights were ok. in my case i think left side of backlight is issue. just get multimeter and test boards and backlights, but i think 99% issue is backlight

Thanks. Will try that.

Si j'en ai trouvé mais j'ai commandé deux paquet de 3v au lieu d'un de chaque

laboratory power supply

How did you know that each LED is 6 volt? From service manual? If i dont have the manual how can i know?

It could be the power supply board I think. I would check the diodes and the capa. Be carefull of high voltage.

Thankyou!

agreed, how did he figure that out?

You mean the strip PCB? Why do you say it's damaged? Obviously you heat it up, but that is not removing the copper or anything?

I tried to apply voltage directly on the LED. Starting with lower voltage. I applied voltage on a 4 LED strip, so I started with 12V, then increased until the LED turned on.

If all the LED are ok when tested then it probably means the problem comes from the LED power supply. Which is usually on the main power supply PCB.

It can be the power supply board. Motherboard I doubt it. But not impossible.

You need to find a local repair shop, I would guess it will be something like $100-200 ? I'm not sure though, it depends a lot on the country.

Did you ever figure this out or did you just get a new one?

disconnect the Motherboard PWM line to the PSU ... and the backlight will be stuck on full power...

Roy Boy I am not sure. It's probably the hardware design of the power supply. Or the led components that have short lifespan. The TV I fixed just had the issue again after 1 year...

For some TVs turn down the LED brightness setting if it’s at 100% by default. Some of come with setting at 100% automatically I think, burns out faster. Could be a faulty cable giving too much power to the strips burning them out quicker. Or maybe LG are just trolls

The right way to do it is to get the panel off the back of tv

@@AB-qv5oc no, you take the panel off from the front , using suction cups for glass... and put it back on the top into the grooves , so you dont crack the screen

i had a cheap monitor i got for free. i found a bulging capacitor and replaced it with a similar voltage and micro farad and it works fine now, albeit a bit dim. the back light did not work at all initially on this monitor, if you put a light right up to the screen you could sort of see something was actually bieng displayed on the screen, otherwise it was just black.

www.walmart.com/ip/Onn-32-1920x1080-HDMI-VGA-75hz-6-5ms-LED-Monitor/133110599 Get this one then replacing the light if live in USA

leon johnson jr why is that is delicate to work on?