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Hello. I am working on a circuit board that is part of a motorized HDTV lift. The circuit board belongs to the controller component that tells the motor to either raise or lower the HDTV height.
The controller started giving sparking when the 29V power supply was attached and the green light on the power supply would go out as soon as it was plugged into the controller board. This indicated a shorted component and I was able to identify which component it is that is causing the short. When I remove this component, the short is cleared.
The problem is finding a replacement component. It appears to be a MOSFET, but searching it’s imprint numbers/letters didn’t come up with anything. I am not familiar with the component manufacturer logo on this component either, so I am not even sure who makes it. I tried using ChatGPT to help me narrow it down, but that wasn’t much help either. I will attach a few pictures and hopefully that is enough for someone to help me figure out what this component is or at the very least, what a good replacement would be.
*All 4 leads are independant of one another. They do not share continuity with any other pin. The large plane is connected to a coil inductor which is then connected to an identical component as this one on the other side of that inductor. I have attached close up pictures to show where this component went and the traces show how the pins are not interconnected with one another.
If you can suggest some tests for me to perform, I would be glad to do those tests for you so we can narrow it down. I have a multimeter, bench power supply, oscilloscope to test with…
First of all, we need to identify the manufacturer by the logo.
If we can’t determine it, you need to draw a diagram and determine the functional purpose of this element.
Maybe I’m wrong, but I assume that this is a DC-DC Converter.
For example, like this:
Some sort of integrated half-bridge driver would be my guess. It appears that each of the two receive power and ground, with the output passing through a common-mode choke to the connector.
Thank you for the replies everyone. I posted this exact question at numerous places so I could get as much exposure as possible. I figured I’d post some of the responses I have received at other places to see if it gets any ideas going about what I am working with here. I unfortunately haven’t gotten any closer to figuring out what exactly this component is.
Here are some other responses (hopefully it helps)
That is what I would suggest as well, similar to SemiOne PE4025KC 40v, 16A, rds 18mΩ, there are many similar dual mosfets, this one is likely some Chinese brand.
the inductor near it makes it look like a buck or boost convertor though.
And someone else linked to an image of a component they thought it might be which I have attached to this post.
For what it’s worth, when I was using ChatGPT to try and help me identify this, it was suggesting that it appeared to be a syncronous buck converter circuit…
Thank you guys so much for the help so far. Hopefully we can narrow this down!
A common-drain complementary FET array fits the bill nicely. These examples of type in TO252-4 packaging as well as the one mentioned above would seem to be suited to the observed trace pattern on the PCB.
