Transistor in laptop motherboard

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nikeliss

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Hello.

I'm fixing Lenovo Z500 motherboard and after test i found that from in to one Transistor volt coming in but not coming out. I ordered new Transistor, replaced it, but right now power not coming at all (in Transistor).

Old transistor:
Old transistor spec: 4483A, AG, W26C


New transistor:
New transistor spec: 4483A, AEA, W58C


Or i ordered wrong transistor? How to know value?


Sorry I'm beginner...
 

I presume the transistor is a replacement of Si4483. It's not necessarily defective. Maybe the gate control signal is missing. In case of a downstream short or overload, the power controller is possibly shutting down the power switch.
 

I'm assuming document.

Given you've replaced it with the same part (different lot code and manufacture site/date)...you're problem probably wasn't caused by this MOSFET, or perhaps it was and you didn't install it with the proper ESD handling and damaged it.

So what did you read on all the pins before you replaced it? The Drain is the 4 pins on the top, the Source is the 3 pins on the bottom left side and the lower right pin is the Gate.
 

Probably I didn’t install it with proper ESD handling..
Before I don’t read pins. I just ordered new transistor with to same name and replaced it.. but I found info about this transistor:


And i don't understand why when i testing motherboard with multimeter it showing -12V

- - - Updated - - -

P.S i'm using 12V charger for test, but if I trying put 19V charger i can see 19v just for a 1min after 1min power connector get hot (50C) and voltage start jumping.

So probably i must change a (power connector socket) ..?
 

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