4k tv LED connector IF1, IF2?

[capwizard]

Samsung un55HU6830 next-Generation 6 series, UHD 4k TV, I have a question about the LED connectors to the backlight LEDs.

What are IF1 and IF2 used for? Are those fuses? I tested the results are shorted.

With LED tester, the tested results the group 1 2 3 are...

1+ 1- group leds are 71.4v / 2.7v = 26.4 leds
2+ 2- group leds are 70.4v / 2.7v = 26.1 leds
3+ 3- group leds are 107.4v / 2.7v. = 39.77 leds
Total leds estimated calculation is tv has 92.27leds. Reality is TV has 91 LEDs.

Pic 3. LED driver output 353V, 450 mA, is that means each led is 450mA?

[budm]

Re: 4k tv LED connector IF1, IF2?

1) If look at the bottom side you will see that the pins are terminated to form series connections for the LED's strings.
2) IF? pins are not connected to anything, no traces to those pins.
3) 353V, 450 mA = it can deliver up to 353V @450mA, since all LED's are connected in series so they all have same current flowing to through them but I doubt that the LED's are being driven at 450mA, may be closed to 400mA.

[capwizard]

Re: 4k tv LED connector IF1, IF2?

1) Yes, you're right. But why Samsung love to series leds together and use 353v to drive them? Isn't that if one of the LED is not working total backlights will distinguish? Samsung has models used 450-volt to drive the LED backlights, I have been shocked once, although they did use an isolated transformer.

2) is that IF going to be used in the future for bigger screen tv?

3) even 400mA, it is like high power Led. I am interested in this kind of TV because high-power, high high-voltage tv is going to give a lot of trouble in the future?

[budm]

Re: 4k tv LED connector IF1, IF2?

That LCD panel you have does not have Zone controlled for the backlights so they just use one LED driver to drive just one LED string.