LED chips for backlight board?

[shelby5041]

hi im trying to do some trail and error trying to repair a led tv backlight board that had 5 bad leds

i removed the led chips and would like to buy replacment led chips

..not sure what to look for when buying...ive seen some 6v ones on ebay for led tvs... the chips have 2 pads on bottom one larger than the other and are about 3x3mm size..very small

just looking for something generic that would work with most backlight boards....doesnt have to be exact oem replacment..just something that will function

what specs would i need to be looking for? voltage? watts? etc etc

[shelby5041]

Re: LED chips for backlight board?

pe board is not

[shelby5041]

Re: LED chips for backlight board?

tech propblems with pc..i hope board is fixable

[Wilderone]

Re: LED chips for backlight board?

Have you got a pic of the LED? it's difficult to see from your pictures.
Do you have a backlight tester to check the voltage of the LED diode or strip divided by number of LED's?
You will need to know the voltage.

To find the correct LED you will need to measure as accurately as possible the width & length ie; 2.8mm x 2.8mm would be a (2828) type, or 2.8m x 3.5mm would be (2835) type so on & so forth.

Secondly check the bottom pads against the ones you are buying they should be identical.

Thirdly the top of the LED will have some variation but match as close as possible to the ones you have.

Here are some examples of ones I purchase, they are very cheap so I usually buy a variety to keep in stock.

https://m.aliexpress.com/item/324738...ddresstype=600

http://s.aliexpress.com/ri6R3Eja?fro...y to Clipboard

http://s.aliexpress.com/JJZbyIjY?fro...y to Clipboard

With the snapped strip I would scratch some of the coating off & jumper together with wire.

[shelby5041]

Re: LED chips for backlight board?

Thank you...yes they r super cheap...so you recommend those 3 sizes?

Not sure what i have ..but ill look on ebay for those

Aliexpress shipping costs too high to usa

What about voltages?

Are the smaller ones 3v and the parger ones 6v?

[shelby5041]

Re: LED chips for backlight board?

And am i looking for cold white?

Warm white?

[shelby5041]

Re: LED chips for backlight board?

Ill try scratching..

[Wilderone]

Re: LED chips for backlight board?

Yes those 3 are common, you will see the last link is the 6v.
Voltages are not size dependant.
As for the warmth, I can usually tell by eye when I light up the panel with my backlight tester, I find if it's a blueish tint it's cool white & if white light it's warm.

You should really invest in a backlight tester;

This is the best one;
https://m.ebay.com/itm/LED-Backlight...from=R40&rt=nc

[shelby5041]

Re: LED chips for backlight board?

Ill research aliexpress..shipping free?

So u recommend

2828
2835
3535

What about 3030

[shelby5041]

Re: LED chips for backlight board?

Thats too much.for tester...can you recommend a cheap version....i dont need fancy...just need cheap

[shelby5041]

Re: LED chips for backlight board?

Most led tvs ive taken apart are bluish not warm color

[Wilderone]

Re: LED chips for backlight board?

Thats too much.for tester...can you recommend a cheap version....i dont need fancy...just need cheap

2 x AA batteries lol

[shelby5041]

Re: LED chips for backlight board?

Oh that easy lol...i have a multi regulated ac adapter incan use..it has 3v 5v 6v 9v settings

[Wilderone]

Re: LED chips for backlight board?

Ill research aliexpress..shipping free?

So u recommend

2828
2835
3535

What about 3030

Yes shipping is free on AliExpress unless you want Expedited.
I recommend measuring the ones you have.

[shelby5041]

Re: LED chips for backlight board?

thanks i just bought some 2828 and 2835 on ali express and bought 3535 on ebay

is 3030 common or not so much?

[shelby5041]

Re: LED chips for backlight board?

how do i know if the led i have are 3v or 6v?

[shelby5041]

Re: LED chips for backlight board?

i guess if i shoot 3v into them and they dont light up but with 6v they do then they would be 6v

[shelby5041]

Re: LED chips for backlight board?

i think they are 3v because when i powered on the board only 3 lights out of 8 lit up and it showed like 8.8v...and then shut off..i would imagine the voltage is variable ? so if the other lights were good the voltage would have been 24v or so?

other question is some led tvs have leds in the hundreds..i would iimagine these are lower voltage leds? i cant imagine them being 3v if there are hundreds of them....dont think you would have 300v going to led strip??? or am i wrong?

[budm]

Re: LED chips for backlight board?

You need to find out if the big solder pad is Anode or Cathode, it is important for heatsinking of the LED.

[Wilderone]

Re: LED chips for backlight board?

you need to find out if the big solder pad is anode or cathode, it is important for heatsinking of the led.

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