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Hi, i just want to know if there are schematics accessible for iMac and also one processing to find if the problem was on the graphic chip. I can reball the gpu if it is the problem. This iMac just dead instantly no sign of graphic problem before

and does it possible to find the internal board view ? The first problem was a high Courant gone through the jack connector. I don't know how but it is clearly the first problem.

I have changed the J6700 and under this I found a hole on the circuit board. I have repaired the circuit for this J6700 and replace the J6700. Now I have the sound on the left and right channel on the head set or on the MBP speakers but I found the same problem on the start and the stop of the...

I found 64kohm on HPAMP_REF. I have remove the U6400. no change.

here :

I have replaced the U6201 and removed the R6805 and the result was the same. for the video I have a message here "invalid file". And same message with just audio :-(

many thanks :-) (Louis ?) :-) Yes the R6990 was blown.. now I have the green light but no boot. I found 3v3 on PP3V3_S5_AVREF_SMC and 3v41 on PP3V3_S5_SMC_AVCC and 3v4 on SMC_ADAPTER_EN what's wrong ?

hi, I found this values on U6990 1 : 0,4v 2 : 16,3v 3 : 3,06v 6 : 1,2v 7 : 2,3v 8 : 1,2v 10 : 0,6v any idea ? :-) please

I find the pin 2 of the R6805 disconnected. So the test was the same and I solder this pin but it is the same result. A "slash" or "tac"before and after the bip sound when I don't place DDR or before and after the chime :-(

Yes sorry the 4.5v was on the pins 24 and 25 perhaps the U6400 was the problem ? Does it possible to test it ? or does it possible to disconnect it and what we can see in this case on OS X ? I find this logic board with dead DZ6704 and DZ6705 and output 38 and 39 of the U6201 and the U6400 was...

Does it possible that the problem was on the CPU?

i have 0v on CS4206_VREF_ADC

always the same problem. The output was ok on u6200 and I test all pin on the u6201 . Does it possible to test the jack ?

No. Same problem ......." TAC ! Chime ! TAC ! "

we have a board with U6201 dead. some burning traces are on pins 38 and 39. lost DZ6704 and DZ6705 I repair the area and change the two DZ and I changed and repair the area of the U6201. Now we have sound (chime) on the boot and immediately a "crash sound" after the chime like a disconnection...

sorry I am French I have shorted the power-on pads and it don't boot

I have used the touch’s on the circuit for the power on and it doesn’t work ! So it is not the keyboard ?

I have no other MacBook Air on the hand

Ok i changed the u5010 and now it boot :-) thanks ! ;-) BUT now the power button don’t works. All keys are working. So I think the button not is the real problem. I used a ssd from a mbp so perhaps it is that because the mbp have is button not on the keyboard ????

voltage on u5010 1 3.39v 2 ground 3 3.39v 4 2.65v 5 0.68v 6 0.69v 7 106mv 8 0.33v