Model A1297 / 2.66, 2.8, 2.93, or 3.06 GHz Core 2 Duo processor

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Q4260 Mosfet burned on mainboard

Hi, the Q4260 (NDS9407) has burned. I changed it, but it burned again. So, I identified a short on the circuit connected to the drain of Q4260. I don't find the other bad component, because I need the eletrical diagram to do this.

Do you have the esquematic diagram of mainboard?

Thanks

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what are the last three digits of your serial number? That way we could identify your motherboard a bit better.

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Fabiano,

Did you found a way to repair your Mac? I have exactly the same problem than you.

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Same board 820-2610A same issue...

Replaced all the surrounding components, same result. The mosfet doesn't apparently have any side shorted to ground but when I give power to the board that component burns out. Only removing the sensing resistor allowed me to sit the component and get some measurements...

I get 8.4v on pins 123 3.4v on pin 4 and 8.4v on pin 5678.

Whanever i sit back R7790 the mosfet say bye bye...

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Fabiano, this is where it gets a bit complicated. I do have two schematics that go with the A1297, but are different by year. I posted the images of the motherboard from both and identified the location of the Mosfet. I also attached the part pertaining to the Mosfet. Hope this helps, good luck.

Block Image

A1297 Mid 2009

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A1297 Mid 2009 Mosfet location

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A1297 Mid 2010

Block Image

A1297 Mid 2010 Mosfet location

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Hi oldturkey0, thanks to your help, the last 3 digits of my A1297 are UVA, May 2009.

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Hi oldturkey0, thanks to your help. My A1297 it's May 2009, same as the first picture. Can you send the schematic to my e-mail, please?

fabiano@zoom.inf.br

Thanks to your help again.

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Replace Q4260 and this two resistors R6911 and R6912 will be great if you can post actual pics of your board too for future help.

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i have 820-2610-A everytime i plug battery it burns mosfet by lcd /fan area and a capacitor right next to it.....

any answers to whats burning it everytime i replace them?

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apparently there is no R6911 or R6912 on the schematics pdf....

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Fabiano will be eternally grateful.
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