can anyone with this router help me to identify that burnt smd ?I want to repair my router, these are expensive here and I cannot afford one now… no joke.
You can get internal photos using FCC ID
I checked and is not legible, also that smd is behind a wire all the photos I’ve found is always behind the antenna cable
That is a transistor FET not a chip. It looks like it passes power through from the input jack to the big capacitor below it. Just about any p-channel power FET should work there. Notice the empty 3 pin pads next to it which are wired in parallel to allow a small 3 pin FET to be used instead.
I'm guessing it is either a virtual power on-off switch and/or overvoltage protection. Can you trace what the gate (pin 4) is connected to?
I agree that it is a FET, but I'd hazard a guess that it is actually the switching FET for the switch mode power circuit (not a virtual power switch).
The drain has a large capacitor to ground which is not how a switching regulator would be built. I think that is the input voltage to the regulator circuit built around the 6 pin chip below it.
The other 8 pin device is also a FET marked "4411" it is probably this:
https://www.digikey.com/en/products/detail/alpha-omega-semiconductor-inc/AO4411/3050817
Good eye... I didn't look as carefully at the trace off the drain.
I know little about this, but I used a multimeter in continuity, and pin 4 of the burnt fet, goes to ground, pin 4 beeps with 5 to 8 showing 14.5 to 20 on the lcd of the multimeter, also to that Ferrite Bead on top near antenna.
pin 4 has resistance to 1 to 3 showed once around 0.30 kohms, but then 60 to 150ohms or more. Also if I touch the top of the fet to ground shows 150 or more and also beeps, if that means anything.
Edit: I found one PDXAL FDS 4935BZ in an old firewall board i had, could it work ?
