Help identifying SOT89 regulator

[Twospruces]

Wondering if anyone could provide some clues as to what part this is?

Assume it is a linear regulator?

Comes out of a power supply ckt in a Toshiba T1000XE.

 

[Chuck(G)]

Looks like you're not the only one looking Another guy
Curiously, both Toshiba T1000 series. I'm not sure that it's a VR; could also be a MOSFET. That 1K resistor in series with what would be the gate makes sense.

 

[Twospruces]

I found 2SK1273 n channel MOSFET has NA marking. Nice find on that thread.

 

[Twospruces]

Simple resistance test shows about 20M ohms between drain and source .. with Vgs open so assumed 0V. Seems high. Unsure is a mosfet would fail short between Drain and source.

 

[Twospruces]

Found an actual blown 2 pin device in a package like an sot89. Marked E2

Strange pin arrangement. This is actually a 2 pin device with a forward voltage of 0.2 V. Measured on a good version of the part. (Board has 2).



More detective work. But this part is definitely blown.

 

[Chuck(G)]

You do know about the fellow who re-imagined (see, I can use that word) the T1200 PSU board and published PCB artwork, etc. on Github?

 

[Twospruces]

More pics of a good part.

 

[Twospruces]

You do know about the fellow who re-imagined (see, I can use that word) the T1200 PSU board and published PCB artwork, etc. on Github?

Think it is the T1600?

 

[Chuck(G)]

This one. Makes sense, unless you're a rabid originalist.

 

[Twospruces]

I looked and did find the github for T1200 psu also. But, I don't yet see the same part that I need to identify.... the search continues.