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When removing F7000 I get 11,7V on PPBUS_G3H and 5V on VDD and VDDP

Yes, ISL6258, DCIN fluctuates as well, so as long as I get the blinking, nothing else seems stable. VDD and VDDP fluctuates as well

I'm kind of stuck with this old 820-2530 board. When plugged in the light on the charger is blinking. PPBUS_G3H i fluctuating between 3.5V and 11.5V, at least this is what i can read on my multimeter. I guess something makes the charger start and stop. It does not run on either battery or...

Ok, I'll try, the other iMac is a 2010, and I guess as long as the 6770M works in the 2010, the 4670 should work in the 2011? The connector in both machines are the same.

I did i opposite, testet each part in another 21.5 inch iMac. In the other iMac both the graphics card and power supply worked fine, I also testet the RAM to be sure. The other iMac that I used for testing did however have a a bad graphics card, this is a 4670.

Ok, then. I really don't know what happened with this one, but after mounting the board back in it suddenly started working again and have been running fine for three days now.

Finally got around to this one again and I have now ruled out both power supply and graphics card, so I guess that leaves me with the main logic board. Do anyone know about any known issues with these boards?

Phew, I have the 6770M, so I'll try tomorrow.

Haha :), but I love my iMac :), I'll have to check which one I have when I get home...

I do however own 27" iMac 2011, will this fit?

Hmm, I really don't have another videocard for this.

Just got this iMac. The owner claimed instability which I used quite some time to reproduce. I let the iMac run Heaven 3D benchmark for about two hours before the iMac just cut off. Started the iMac again and started the benchmark again and it lasted for about 10 minutes before cutting off...

Replaced U5700 now and both trackpad and keyboard works perfectly again.

Ok, thank you.

I have matched D + Y already, although they match I guess I'll try to replace U5700 when I get home.

Thank you, but it was the first thing I checked.

Do you know if there are any schematics for this?

Do you know if Pin 8 powers the U302 and 204?

Measured J5700: Pin 1 3.3v Pin 2 3.3v Pin 3 0v Pin 4 0v Pin 5 0v -> 3.1v when trackpad connected Pin 6 0v Pin 7 0v Pin 8 3.3v Pin 9 3.3v Pin 10 5v Pin 11 3.3v Pin 12 3.3v Pin 13 3.3v Pin 14 3.3v

Having some trouble with this one getting trackpad and keyboard to work. Board shows no sign of water damage or corrosion J5700 is clean. I have tried with a known working keyboard, trackpad and flat cable. The board must se some of the trackpad since the fan spins at normal speeds when...