Electronics > Repair
Need help to identify burned smd component
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Alex_ulli:
I have a tennis ball machine working from 18V battery. It doesn't switch on anymore, I opened it and there is one burned component on the PCB (top right corner of the board, next to the power input), it seems like it should be some kind of stabilizer, but I can't see what was the marking on it - just the remains of the last two digits - "43"(not sure about it). So if anyone can help me with identifying that component or a replacement - it would be great. Thank you!
picburner:
The silkscreen says "Q10" so it is not an IC but probably a mosfet in SO-8 package.
To have a clearer idea of ​​the type of device you should draw a rough schematic of that section.
Alex_ulli:
This is a multilayer pcb, so I can't see connections between elements. I only can measure resistance between some points, not sure if this will help:(

The only thing I can say for sure - the first 3 inputs to the missing element (mosfet?) are connected to +18DC directly.

Any thoughts?..
picburner:
That connection could indicate a P-channel mosfet.
But to be sure, you would need to investigate the connections further.
picburner:
I was just only focusing on your request before.
Now, looking at the rest of the board, I see that Q41 and Q42 also have burn marks on them.
Unless it's just an optical effect, it might be a good idea to check for other damage before doing any replacements.
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