There's one component on the bottom side of the power board with an "LOB" case marking. It's approximately between the LM358 and LM385 chips. It's a 3 leg part. I was getting somewhat comfortable with identifying parts with letter designation markings, until I became stumped with this one. In a static test, this part is shorted. One of my 3 boards has readings, so I'm fairly sure 2 are shorted? Could someone please help me with this parts' identification? Thank you!!! Joe
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If you read the 3 legs with a multi meter on ohms, I'll bet you get a short between 2 of the 3 legs it's an FET field effect transistor!
Alan
Thanks Alan! Yes, that's correct. In an internet search for MOSFET's with case markings of LOB, it returned MGSF1N03L. Any votes for or against this??? Thanks, Joe
LM3480IM3-5.0
Tip. It's a 5V regulator IC...but it generates a 5V used locally on just the power supply board. This is a different 5V than the 5V generated by 3-pin TO-220 regulator bolted to the frame with the red-black-yellow wires.
Stan!!! Your help is greatly appreciated!!! Thank you for the added explanation! Every bit is helpful!!! -Joe
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