VOGONS


First post, by froller

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Hello there!
If anyone have MS-4138, please help me identify element on that motherboard. Transistor Q2 in SOT-23 case near 3rd and 4th ISA slots (see photos)
I think it should be either 2AK (PNP BJT MMBT3906) or 1AMN (NPN BJT MMBT3904).

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Reply 1 of 2, by computerguy08

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Try to reverse engineer the area around the transistor, it should be a general purpose 2N3906 or 2N 3904 (PNP or NPN).

Depending on how the transistor is connected to the power rails/if the base is pull up or down, you should be able to identify the type needed.

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Reply 2 of 2, by froller

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computerguy08 wrote on 2021-02-05, 11:37:

Try to reverse engineer the area around the transistor, it should be a general purpose 2N3906 or 2N 3904 (PNP or NPN).

Depending on how the transistor is connected to the power rails/if the base is pull up or down, you should be able to identify the type needed.

Good idea!
Looks like it is MMBT3904 (2N3904 but in SOT-23) 'cause its emitter is tied to the ground.

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