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it’s a tp-link archer x21. Ax1800 WiFi 6 router. I unplugged the router to clean. When I plugged it back in I smelled something burning. Only the pj021m 1m chip get hot. I would like to fix it but can’t find the chip online. Please help me find the chip. Thank you.
Some more pictures. Front and back.
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I could not find the part either, though this site is usually a good reference. However, I don't this part is actually the problem, I'm 99% certain that's a reverse-voltage protection diode (based on where it's located on the board and the package it's in) and it should only heat up if something else on the board is drawing lots of current.
Unfortunately, if this part is warm and the device is unresponsive, it's a good indicator that something else is wrong, like a short or blown component elsewhere. I would look around for other suspiciously warm components and / or damage to the board that could be causing a short.
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@chrisgreen any idea why they would give it a reference designator starting with T instead of D or ZD etc? T would be would be transistor designator. Very strange indeed.
@chrisgreen I was thing something else is wrong. But nothing else gets hot. I will check the board again to see if any other component looks burnt out. I don't have a microscope to see the really tiny components but I will take more pictures and zoom in.
@oldturkey03 I've been thinking about this all day and still don't have a solid answer. There are some other components on the board with a "T" designation that are also in 2-pin SOD-like packages near the USB port, which might be for ESD protection (so they're probably diodes). Here are my two theories:
1) These are transient voltage suppression (TVS) diodes to protect from ESD or surge voltages and that's where the T comes from, hard to know for sure without actually having more information about the mystery part.
2) This device was designed in a non-English speaking country and the T comes from a translation or other convention that isn't in line with IEEE/ASME standards.
@chrisgreen oh I am not disagreeing, just wondering and kicking the can down the road while I do so. I've looked at a couple of other boards (different series) and they all seem to have a component like that, within the vicinity of the power port. How about just replacing it with a run of the mill 1N4001 to see what happens?
It definitely could be worth a shot. If @Peanutbutter03 has a multimeter, it would be wise to check if the diode is wired in series with incoming power from the jack, or in parallel with the jack (spanning positive and negative). If it's the later, they could just desolder it as a test and see if that fixes it.
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@peanutbutter03 post a picture of the complete board and one of the IC itself. On the board picture, mark where the IC is located. It's a lot easier to try to identify it that way then by just a manufacturer's number :-)
Go ahead and edit your Question, then use this guide Adding images to an existing question to add the images to it.
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How did you clean it?
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@aactech Mike: Dry dusting with piece of bath towel.
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@oldturkey03 uploaded the pics.
crwdns2934271:0crwdnd2934271:0 Peanutbutter03 crwdne2934271:0
@peanutbutter03 That's a new one on me - piece of bath towel. Possible static electricity??? Did you never do the glass rod and rubbing with a cloth in physics in secondary school? Remember it picks up the bits of paper?
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