Need to find replacement LED 6.5mm X 3 mm

[squeaks]

I am looking to replace a LED for LG 55LM4600. The leds are for backlight mounted on strips on side of screen. There are 66 LED's although I am just looking for a few. Anyone know of the replacement LED type? I attached a closeup picture. The LED's are 6.5 mm X 3 mm. Thanks!

[vinceroger69]

Re: Need to find replacement LED 6.5mm X 3 mm

nearest i can find doing a quick search thgese are 1w but please check the specs of yours first.
https://ru.aliexpress.com/item/70lm-...egoryId=400101
https://ru.aliexpress.com/item/100PC...8-6f2dc25aaf63

[vinceroger69]

Re: Need to find replacement LED 6.5mm X 3 mm

[QUOTE=vinceroger69;707119]nearest i can find doing a quick search thgese are 1w but please check the specs of yours first.
https://ru.aliexpress.com/item/70lm-...egoryId=400101
https://ru.aliexpress.com/item/100PC...8-6f2dc25aaf63[/QUOTE

this site has some information on leds too that may help uou with replacements
https://www.sahy.cz/LED-Backlight-c5_94_2.htm

[mariushm]

Re: Need to find replacement LED 6.5mm X 3 mm

The dimensions aren't really that important, because you can hack a smaller or larger led in there.
It's more important to figure out the led's forward voltage and the current because such leds may have multiple diodes in series under the phosphorus.

If you have an adjustable power supply you could limit the current to something like 10mA and slowly raise the voltage from around 1.5v ... each led in the die should slowly light up and you could determine the number of elements in series simply by counting them.

Once you have the forward voltage figured out, you could determine the current going through a strip of leds simply by replacing the faulty leds in that strip with zener diodes rated for that forward voltage. For example, if your leds have a forward voltage of 6v, you could use a 5.6-6v zener diode instead of the led for a brief period of time.

Start the TV, set the brightness to max, and measure the current in the strip of leds, and that's your maximum current ... you'll know you probably need to buy a led that's rated at least 10-20% and now you have the current as well.
Ideally you'd also figure out the color temperature but whatever.

Once you have the forward voltage and max current, you can go to Digikey/Mouser/Newark and filter by smd, forward voltage , a current range that has your max current, and then you pick the ones that are remotely close to the shape of your led (because you can use copper wires, or scrape a bit of insulation off the pcb to solder slightly different leds if needed)