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No green light with this board. I have replaced bad C7771 Board looks very nice and clean! PPBUS_G3H 8.4V PP3V42_G3H 3.41V ISL6258 14 ACOK 3.2V 2 DCIN 16.5V 3 ACIN 3.95V

After I put R5701 back keyboard works. Thanks a lot. I learned many new things this time. Computer is already sold, 250$ without charger and harddrive.

Thanks a lot. You are a true Mac Superhero in my eyes. Of course it had EFI password. Cleared PRAM and now it works. Now it´s just the keyboard connector that i have to deal with

Ok, thanks. Will try that tomorrow.

No efi pass. With USB keyboard and internal disconnected it still auto writes in the password field. With the internal I can stop the auto writing but with USB keyboard it just continues to write. There must be something wrong with the internal keyboard connector. I will look closer at it...

I get ? folder everytime i reboot. But if I swap ram or remove one it boots to login

When I´m logged in everything seems to work normal except that I can´t write Z

It is still strange. All keys seem to work except Z. Tried two different keyboards with same results. Sometimes it boots to folder with ? but if I channge the rams again it boots ok. When the login screen shows the screen flashes about 4 times. In the password field there is one * already. When...

I tried to change ram, and now it works

I know its old but I want to fix it. At first it didn´t start at all, had green light. Replaced C7771 and that solved the first problem. Now it boots up to folder with questionmark. Tried different cables to harddrive. The same thing when I try boot from usb. Holding down ALT when booting...

all S0 and S3 rails goes high when fan spin

same numbers on SPI ROM on both boards.

I get 12.6 volt on both sides. It was only that pin on u7400 that looked bad. But almost all joints around u7400 look a bit poorly soldered. There are many pads that doesn,t hav solder up on the side on the chip. Can the problem be caused by a bad u7400. Should i try to replace it?

I bought the mbp for 50$ with no other information from The seller than that it wouldn't start. R7402 doesn't look corroded. It's the pin on U7400 that it's attached to that was corroded.

it's a bit hard to see but 0,9 volt on both pins. the "no image" board is 0.97 volt

hi I think I have problems with understanding how to measure things. I measured L7550 and L7510 in diode mode, red on ground black on coil, and got 0.013 If i measure ohm on my fluke between coil and ground i get 10.9 on L7550 and L7510 My other board, with no image; measures 10.7 on L7550 and...

yes, it's to low. I wrote that in my second and third post in this thread. Or is it not a short to ground when it measures that low?

all_sys_pwrgd goes from 0v to about 3v when fan spins resistans to ground on both coils is 0.015

it measures 91k

measured over. diode mode L7510 and L7550 is 0.015 on both R7402 is ok but pin 2 on u7400 does look a bit worse than the other pins.