Help identify J1 chip Toshiba R50-B Laptop

[sikocan]

Thanks

[sikocan]

Re: Help identify J1 chip Toshiba R50-B Laptop

Faebsy2 motherboard model

[sikocan]

Re: Help identify J1 chip Toshiba R50-B Laptop

Top 2 pins are ground
Other pin connected to 19v rail 470 ohms resistor

[jiroy]

Re: Help identify J1 chip Toshiba R50-B Laptop

It's BSS138 Mosfet ..

[sikocan]

Re: Help identify J1 chip Toshiba R50-B Laptop

How did you know Jiroy?

[sikocan]

Re: Help identify J1 chip Toshiba R50-B Laptop

But pin 1 and 2 are in ground. Doesn't make sense.

[jiroy]

Re: Help identify J1 chip Toshiba R50-B Laptop

But pin 1 and 2 are in ground. Doesn't make sense.

It's definitely a BSS138 , now what's its purpose here , i need a schematic to tell ..

[sikocan]

Re: Help identify J1 chip Toshiba R50-B Laptop

I don't know, but 19c charger V comes into a 470ohm resistor then to this ic.

[jiroy]

Re: Help identify J1 chip Toshiba R50-B Laptop

I'll check my schematics to see if I have this model .. In between , I've seen even some transistors used as only a 2 pins diode , so I can't tell right now .

[piernov]

Re: Help identify J1 chip Toshiba R50-B Laptop

They don't look connected to me, there's a gate drive trace going under the component. Maybe discharge MOSFET.

[jiroy]

Re: Help identify J1 chip Toshiba R50-B Laptop

The best I could get is a high resolution picture from a similar laptop R50-B , Not a schematic .. It shows clearly that the 2 pins aren't connected to the ground otherwise they would be soldered on the same trace , logically .
Now either , like Piernov mentioned , discharge mosfet , or check if something abnormal happening like an open or short mosfet .