Chosen Solution
Some facts:
- I am still able to turn my Mac ON (details below, may be helpful for someone)
- It does not react anyhow to power button, I can’t turn it on/off/sleep with power button
- Top case with power button is not the problem (tested on another Mac)
- Resetting SMC, PRAM does not really help
- I am confident it is logic board issue As described above I have late 2006 Core 2 DUO Macbook 13 with some problem that it not reacts anyhow to power button. Otherwise the keyboard and touchpad work. The only way I found to turn it ON is to disconnect the PRAM battery. With disconnected PRAM battery every-time when the MAC loses power (disconnect power supply and remove battery) it starts itself automatically up on connecting to power supply. (That is not a fault that is normal behavior, which I observed on more units). So I am able to use my Mac normally until I turn it off, then I must remove the battery (and lose WIFi passwords, time, date setting etc). What can be the problem? Obviously something with logic board but what? I do not mind any soldering, but I do not know where to start, I see one transistor close to the keyboard flexcable socket which is described as “power button”, may be I should start there? I saw on newer Mac’s that there are two soldpads on logic board, where by shorting them it is possible to turn it ON, but I see nothing like that on my logic board (except the transistor mentioned above) Edit: Scheduled start up in Energy saver preferences also works.
Problem located and fixed. Microscope with 20x magnification helped me again. There was 1 Kohm resistor next to topcase flexcable socket which was lose. The resistor was connection between power button and transistor on the logic board which actually turns it ON. I resoldered the resistor and connection is OK.
Hello radek, where was that resistor? Was it on the motherboard or on the board that is on the topcase — because there two flexcable sockets actually. Thank you.
