short-circuit with dc-board and power adapter

Question

iBook G4 14" 933 MHz-1.33 GHz

Model A1055

107 Questions View all

Question Closed

Gabor Babusa @gaborbabusa

Rep: 13

2

1

Posted: Dec 5, 2012

Options

short-circuit with dc-board and power adapter

Hi all,

I've changed a faulty logic board in a 14" iBook, with a "good" one, when it was halfly assembled (without shielding, and cases) I've tried it, it worked.

After I fully assembled it, I couldn't turn it on.

I've fully disassembled it and connected a power adaptor to dc-board, I've heard a noise like a short-circuit sparkling and I've also smelt it.

But if I unplug DC-board, and turn it on with a battery, it runs.

I've found an smd cicruit moved from its position, and a circuit with colored (burned?) pin, my colleauge change them, but the situation remained the same. But when I touch the circuits around the dc-board connection at logic board I've found 4 circuits extremelly hot (my finger can't stand the heat), when the adapter was plugged in. I marked them the picture below:

With another iBook, this circuits are cool.

Answer this question I have this problem too

Is this a good question?

Yes No

Score 0

3 Comments:

I've forgotted to mention, that it sparkling with two different power adaptor, and three DC-boards (one 14", two 12")

Dec 5, 2012 by Gabor Babusa

It seems that a 4435 MOSFET circuit died in the 24V power line.

It also labelled as P42AA.

I have a few logic board, but I couldn't find an exactly same one.

I have the following 4435's:

L37AA (G4 12” 800MHz)

L47AA (G4 12” 800MHz)

L47CA (G4 12” 1064MHz)

L48AA (G4 12” 1,2GHz)

L44CA (G4 14” 1,33GHz)

To which one of this could I have change the died one?

Or doesn't matter till it comes from an iBook logicboard?

Dec 13, 2012 by Gabor Babusa

Trying to find a datasheet for any off the components but none of the numbers cross reference. Any chance you could post a less blurry image that show the markings a bit clearer?

Dec 13, 2012 by oldturkey03

Add a comment

1 Answer

I've forgotted to mention, that it sparkling with two different power adaptor, and three DC-boards (one 14", two 12") — Gabor Babusa
It seems that a 4435 MOSFET circuit died in the 24V power line.

It also labelled as P42AA.

I have a few logic board, but I couldn't find an exactly same one.

I have the following 4435's:

L37AA (G4 12” 800MHz)

L47AA (G4 12” 800MHz)

L47CA (G4 12” 1064MHz)

L48AA (G4 12” 1,2GHz)

L44CA (G4 14” 1,33GHz)

To which one of this could I have change the died one?

Or doesn't matter till it comes from an iBook logicboard? — Gabor Babusa
Trying to find a datasheet for any off the components but none of the numbers cross reference. Any chance you could post a less blurry image that show the markings a bit clearer? — oldturkey03