Post The Led Backlights Your Fixing Here.

[dskall]

Re: Post The Led Backlights Your Fixing Here.

I was thinking about this subject the other day because it was confusing me to. Of course it is just ohm's law. I am just learning this stuff.

[budm]

Re: Post The Led Backlights Your Fixing Here.

Yes, I set the voltage at 24V (3V for each LED) and 800mA limit (100mA) for each LED.
When I applied the probes to the sets of LEDs the power supply showed 60-70mA, I was expecting it to hit the current limit but it wasn't close.
Testing a handful of individual LEDs with the voltage set at 3v and the current limit 100mA, I see current draw between 40mA to 80mA
Why do 8 LEDs draw as much current as a single one ? I'm confused, what am I missing ?

1) Series circuit: same amount current will flow through all 8 LEDS, you do not add the current for each load in the SERIES circuit.
2) As I indicated, not all 8 LEDs will have the same Vf.
2) As I indicated, if you slowly crank up the power supply Voltage of that power supply, you will see the current starting to rise sharply. Did you do it as I suggested?
You will learn a lot by doing the proper experiment.

See page 10 of the LG LED spec then you will see why.
LED is not linear device, you can how much current will change with small amount of change of the Voltage.
Per chart @3V If is about 80ma, @3.2V it goes over 150mA.
The spec. on page 5 also show Vf of 3V @65mA.
The Vf of the LED in the working TV will be higher than 3V because the If is in the range of 200 ~ 400 mA range.

[Vista20]

Re: Post The Led Backlights Your Fixing Here.

I'm replacing my edge LEDS now. Samsung UN55D6050TFXZA. The part # on the LED strips is 2011SVS55-FHD 5k6k, left and right.

I noticed there was some double stick tape on the rail in front of the LED strips, but did not appear to adhere to the LED strips. Is that double stick tape there to better secure the flat panels?

I bought a roll of double stick tape from ShopJimmy.com.

I think I can replace everything properly once my LEDs are reinstalled and connected. I bought some new screws to secure the LED's because the ones holding in the old strips were tough to get out and the Phillips head stripped
on several of them in the process.

Does anyone know of a tutorial on replacing these types of LEDs, just in case I need a reference?

[reeferman]

Re: Post The Led Backlights Your Fixing Here.

Samsung UN55F6400. 3 RH strips had bad LED's. Two strips each had 1 bad, one had 3 bad,
After replacing the 3 on one strip, I had to replace 4 more!
3 volt 3535smd led