Help identifing a component on LG eax65040104 main board

[monti]

Hello everyone, just got an LG 60LA860W that i'm attempting to repair. There is a blown component on the main board eax65040104 circled in red on the picture. After cleaning it i see that its marked L7201, i believe that's an inductor but the value given on the schematic doesn't help me to find a replacement. Can someone help me find a suitable replacement for that component please

[R_J]

Re: Help identifing a component on LG main board

I don't know why the call it a 120-ohm, I would just use a 0Ω resistor or a chip fuse in its place or find a similar size chip inductor, But you will have a short either on the t-con board or on the panel, that's why it burnt up.

Here is likely what you want:
LG EAM38769505 Filter, Bead
filtre UBW2012-121F 120OHM . 2X1.25X0.85MM 25% 0.04 OHM 5A

[monti]

Re: Help identifing a component on LG main board

Thank you for the answer, i was confused why the listed ohm rating for a inductor that's why i wanted to ask for help, i looked over the t-con board and it looks perfectly on visual inspection, no idea about the panel, its not broken anywhere or damaged in any way, the tv starts up and the backlight starts and stays on there is just no picture on the screen, i tested the fuse on the t-con and it was fine, how can i test the t-con and the panel to see if the problem is there. Thank you for your time

[R_J]

Re: Help identifing a component on LG main board

something burnt the coil, You could just install a thin strand of wire in place of the coil and see what happens, I'm not sure how looking at a board can determine a bad component, but that's up to you.

[lotas]

Re: Help identifing a component on LG main board

Check these capacitors for a short circuit; they are located after this inductor; if one of them is short, then a problem like yours will occur.

[monti]

Re: Help identifing a component on LG main board

something burnt the coil, You could just install a thin strand of wire in place of the coil and see what happens, I'm not sure how looking at a board can determine a bad component, but that's up to you.

Thank you for the reply, you are absolutely correct, that the visual inspection can determine if something is bad or not, i will check the components of course but the visual inspection was how i found the burnt inductor. After the your post about the short i measured on the lvds cable to ground on the pins that connect to the burned inductor to see if there any shorts down true the tcon and panel but it didn't had any. I will take the tcon off again and check the elements on it for any shorts.

[monti]

Re: Help identifing a component on LG main board

Check these capacitors for a short circuit; they are located after this inductor; if one of them is short, then a problem like yours will occur.

Thank you for the reply, i did check them, only one of them is on the board the other is not populated, the one on the board is not shorted

[monti]

Re: Help identifing a component on LG main board

something burnt the coil, You could just install a thin strand of wire in place of the coil and see what happens, I'm not sure how looking at a board can determine a bad component, but that's up to you.

I followed your advice and installed very thin strand of wire and the tv started right up and works perfectly, i ordered the right part that you suggested and will instal it after it arrives in few days. Thank you both for the help!!

[alfatv]

Re: Help identifing a component on LG main board

The component is ferrite bead, 120 Ohms is impedance at 100MHz.
Inductor is not a substitute for this type.

[R_J]

Re: Help identifing a component on LG main board

LG EAM38769505 Filter, Bead
filtre UBW2012-121F 120OHM . 2X1.25X0.85MM 25% 0.04 OHM 5A

[monti]

Re: Help identifing a component on LG main board

Thank you both for the replies, yes i did ordered ferrite beat just like R_J suggestion in his first reply, sorry for keep calling it the wrong name. Thank you for the help

[R_J]

Re: Help identifing a component on LG main board

The board shows it as L7201, the L usually suggests an inductor or coil, They should have id it as FB7201, In some cases I have seen a small coil in the panel vcc line, The panel DC supply is not a critical circuit.

[monti]

Re: Help identifing a component on LG main board

Yes bad labeling i guess, that's what confused me in first place.Thank you for all your help. Only thing left now is to figure out where all the screws go since the tv came with a bag of screws from when the previous person tried to work on this tv and didnt find anything wrong with it so i managed to buy it very cheap