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leonardo
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Burned SMD component

Mon Oct 30, 2023 9:17 pm

Hello
due of a lightning my RB2011 won't turn on. Connecting a power supply it goes in protected mode. Opened the case I found a burned component, the one marked as "L2" but I wasn't able to identify it... removed it, obviously the power supply is working but the RB is off. Does anybody have an idea about this? is it a diode, a zener a Varicap? Really no idea...
I attach a pic of the board where the L2 was placed, is marked in red.
Thanks in advance, Leonardo
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gigabyte091
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Re: Burned SMD component

Tue Oct 31, 2023 5:42 am

That seems to be inductor, what number is on it ? Its probably a part of a power supply so no wonder it wont work.

But in case of a lightning strike... Hardly there is only one component faulty...
 
leonardo
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Re: Burned SMD component

Tue Oct 31, 2023 9:02 am

Hello, thanks for answering me!
as I can see it was just a peak of power, the lightning didn't hit directly my house, I had few damages (router, only the VDSL port and the RB).
Visual inspecting the RB it seems to be ok, anyway for a few cents component I can try to fix it :)
sadly there's no number on it, ot it's no longer readable, so I cannot identify it
 
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antonsb
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Re: Burned SMD component

Tue Oct 31, 2023 9:52 am

FB1 CB04YTYH800 Viking Tech Corporation Ferrite Bead 80 Ohm 3A 1204
pic-selected-231031-0952-07.png
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leonardo
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Re: Burned SMD component

Tue Oct 31, 2023 9:55 am

YES! I got the info from a very kind support system.. now I have to find it :D
thanks all for support :)
 
leonardo
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Re: Burned SMD component

Thu Nov 02, 2023 6:26 pm

Ok I found the component on Aliexpress for less than 2,50 euro... 100 pieces... It will take its time to arrive, as soon as I'll get it I'll do my test :)
 
DeviceLocksmith
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Re: Burned SMD component

Mon Nov 06, 2023 10:42 am

Passive components don't burn out alone, unless we are talking fuses. Expect some silicone nearby to be fried as well.
 
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Ca6ko
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Re: Burned SMD component

Mon Nov 06, 2023 11:52 am

Ok I found the component on Aliexpress for less than 2,50 euro... 100 pieces... It will take its time to arrive, as soon as I'll get it I'll do my test :)
You can short-circuit the inductance to do a test. The Schottky diode must be broken and something else in the red circled area. In general, do not wait for inductance, look for other burned parts. Burnt inductance is a consequence, not a cause.
Screenshot_16.jpg
FB1 CB04YTYH800 Viking Tech Corporation Ferrite Bead 80 Ohm 3A 1204
Why didn't you show the other parts, because the filter inductance was not the only cause?
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