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MacBook Pro A1260 - Logic Board Repair - No Power Up

Hello,

MacBook Pro non-unibody 15" Core 2 Duo 2.5Ghz Model A1260 - Early 2008 that doesn't turn on.

Logic Board 820-2249-A

It has the nVIDEA 603 chip, the one that is considered more robust. Most of the problems with nVIDEA chips were the 602 model.

Battery, PSU, RAM and Power button are working fine, those were already tested.

SMC was already reset

The PSU connector shows "Green Light" when connected, nothing happens when I press the Power Button.

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I was able to force start the computer by doing something that was suggested in another thread, it's an SMC Bypass power up:

1- Remove Battery and PSU connector

2- press Power Button for 10 seconds

3- while keep pressing power button insert PSU connector

4- then continue pressing for another 10 seconds

5- the Macbook will boot up normally, graphics, RAM, HD and OS work has supposed. Battery will not charge if you insert it after because the SMC was bypass, an the battey charging duty is controled by SMC

Power button will work for Shutdown

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So the MAC works and starts if the SMC is bypassed, probably or the SMC chip is bad, or any circuit around it, or it could any part of the circuit the SMC controls

I have electronics knowledge, and SMT soldering skills and equipment.

I would like to Repair my Logic Board and not replace it.

Theres a lot of people having the same issue, but not a lot of info besides replacing the whole logic board

Does anyone know what is causing this problem in Non Unibody Macbook Pros?

Is there anyone around here that was able to fix their Logic Board?

Thank you so much for your help

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You should be able to find schematics and board views on line for that motherboard. Once you have them, Post the resistance to ground on PP3v42_G3H

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Hello, thank you so much for your reply.

I got the schematic and a board view today. Will measure the resistance and let you know. Thanks

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hello ,ilcaccillo. i have same problem with my MBP A1260 Start on power suply but not start on battery, battery is new ,say message battery no avaible. I cange power board,battery conector ,i reset SMC,i reset PRAM . When eject charger ,run on battery about 1 hrs and after i put in power source and say 0 procent and calculating and battery no charging. You can help me with schematic and a board Macbook pro 4.1.My mail adress its radudragan13@yahoo.com. Sorry my bad english but i am from Roumania.

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