LCD Backlights Driver - Unknown Component

[2X]

Hi,
I have an "LCD Backlights Driver" and it is not working. After measurments and checking the routes of the PCB I beleive that this component on the red circle is a choke for filtering the supply voltage and block noise from the inverter to go back to the main board. When I measured in ohm and in diode mode with multemeter shows always OL. Am I right that this is a choke and if yes what value do you beleive is (maybe 15uH or the 15 on the component is just an SMD marking code?)?

Chips Datasheets:
TL5001
https://www.ti.com/lit/ds/symlink/tl5001.pdf?ts=1689617330693&ref_url=https%253A%252F%252Fwww.google.it%252F

LA6339
https://datasheetspdf.com/pdf-file/390880/Sanyo/LA6339M/1

[fzabkar]

I agree that the component looks like a 15uH choke. I would be tempted to bypass it with a wire link or a fuse, just for testing purposes.

[2X]

I agree that the component looks like a 15uH choke. I would be tempted to bypass it with a wire link or a fuse, just for testing purposes.

What "Maximum DC Current" do you suggest to put to the new one.
https://gr.mouser.com/c/passive-components/emi-filters-emi-suppression/ferrites/ferrite-beads/

[fzabkar]

I would take the rating of the backlight as a reference.

Pbacklight = Vin x Iin

Iin = Vin / Pbacklight

[2X]

I would take the rating of the backlight as a reference.

Pbacklight = Vin x Iin

Iin = Vin / Pbacklight

If I measure with a multimeter the current that it draw when it works and then multiply it by 1,5 times?

Ichoke = Imultemeter * 1,5

[fzabkar]

Sounds like a good approach.

[2X]

In ferrite beads there is no characteristic of inductance. Do you know in which category I have to find it. The current that I measured with multemeter is 550mA, so I want rated current 1,5x550mA=825mA~1Α.

https://gr.mouser.com/c/passive-components/emi-filters-emi-suppression/ferrites/ferrite-beads/?q=choke


All Categories:
https://gr.mouser.com/c/?q=choke

[Jwillis]

The SOT-563/EMT6 code D3 is a NPN + PNP digital transistors. https://www.s-manuals.com/smd/d3   https://www.s-manuals.com/pdf/datasheet/e/m/emd3%2C_imd3a%2C_umd3n_rohm.pdf
Not a regulator.

[fzabkar]

I'm not sure that the RF choke is 15uH. It looks too small. I'm wondering whether it is 15nH.

[2X]

Finally this is a fuse. This type of fuse consider slow, or Medium, or Fast blow(I beleive)?


Fuse Datasheet:
https://www.koaglobal.com/-/media/Files/KOA_Global/EN/product/commonpdf/ccp.pdf


https://gr.mouser.com/c/circuit-protection/fuses/surface-mount-fuses/?current%20rating=1.5%20A&fuse%20size%20%2F%20group=1206%20%283216%20metric%29

I found this below. The broken was 1.5A/75V/1sec@250%of Ampere Rating and the replacement I found is 1.5A/125V/5sec@200%of Ampere Rating. Do you beleive the difference in the time will not safe?
https://gr.mouser.com/ProductDetail/Littelfuse/047001.5DRSNP?qs=gt1LBUVyoHldARnbZDuW6Q%3D%3D


https://www.amazon.co.uk/AGOUNOD-fuse-100pcs-Micro-CCP2E/dp/B0B62FQX1N?th=1

https://www.aliexpress.com/i/32770933783.html