Electronics > Beginners

FMMT597 transistor not working

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Zero999:
Dough, I wanted him to figure out the correct places for the collector and emitter connections.

CJay:
Ooops....  |O

'Left as an exercise for the reader'

Chris Hasler:
Didn't realise that the schematic would be wrong as its a rework of a through hole board to smd.

So the next question is how did it work on the last 2 board revisions?

I will have to work out if the boards are salvageable.

Zero999:
One possibility is the footprints for the transistors, on the previous board revisions, had their collector and emitter connections reversed, so it worked.

CJay:

--- Quote from: Hero999 on July 13, 2018, 01:50:40 pm ---One possibility is the footprints for the transistors, on the previous board revisions, had their collector and emitter connections reversed, so it worked.

--- End quote ---

Or if the last boards were through hole the transistors might just have been fitted bass ackwards and the schematic has never been correct...

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