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Check for PP1V05_S5

YES! R7051, R752 and R7050 have to be physically connected! These are responsible for current sense .... According to your description your machine thinks it is on fire and shuts PPBUS off

Here I will explain the way I fixed some boards by rewriting the Apple EFI SPI ROM. You should try this if your machine has the following symptoms: stuck in a start-stop loop without posting it will boot, chime, load the OS, but the WiFi, and/or the graphics will behave irregular. it will...

I used the first one but it is easier to use direct heat stencils. The variants with 80x80mm or 90x90mm stencils are more difficult to use since you have to pull the stencil away after you applied the balls.... Probably you will end up with a mess. Direct heat stencils are cheaper and easier to...

This is ohms Law ;) If you have R1 and R2 in series you can calculate the total resistance RT=R1+R2 Example: R1=1MΩ R2=2MΩ ==> RT=1MΩ+2MΩ=3MΩ BUT if you have Resistors in parallel you have to do this calculation: Because there is another resistor in parallel in your case the U6990, the RT...

Louis is right use it as donor board. But if you want to fix it, put it away, get yourselves a day off, forget about it, enjoy the sunny day, go to the beach, relax and then come back with new motivation and treat the machine as never touched it before! Measure all the rails from the beginning...

Remember CPUs and GPUs have a very low resistance so you will get a very low voltage drop in diode mode! Don't think it is a short to ground! Best way here is to compare values with a working board

Ok the Mac Air mid 2011 (post #8) works again too :) Same Problem with the SPI ROM Seems to be a common problem

HURRRRAY machine works again :) Solution was: - read the SPI ROM - extract my serial number - download a clean dump and inject my serial number - write back .... and there was a nice LOOOOOONG DONG looking back it was kind of though and troublesome since I had to start from scratch and had to...

I have some of these connectors lying here. You can harvest some of your donor boards. I set my hot air station as high as it will go and heat the board from the other side. It takes about 40sec for my Aoyue to melt the solder of the other side of the board!

You got to be kidding me ..... I got a Mac Air mid 2011 today with exactly the same behavior and the same readings and the same voltage drop on the MAX-Chip (witch I thing is normal) witch leads me to the point where I think I'm cursed since I get more of these nightmare jobs in the last days...

Defenetly check the resistance between these legs Louis mentioned before and tell us the value. I would change the ISL straight away to be sure there is no corrosion underneath it since the area looks like C&B ;)

To be honest I didn't understand it at first time too but a quick google search revealed a bunch methods how to do it. @DUKE: Also you mentioned these readers in another post here in the forum: EZP2010 and TL866 But I have so much stuff lying around here so I build a reader out of an arduino...

R7402 is bang on 90.9K and ALL resistors by U7000 are good :/ Changing the ISL was my next thought but it sounds arbitrarily... What could cause the SMC to die? Could the SMC cause the voltage drop at the TON pin?

So I got this A1278 820-2936-B machine in a absolutely perfect condition - no scratches, no dents, no liquid spill, no sights of usage at all :) The Costumer told me it went off by itself and never come up again - battery is charged! Now my results: -green light is present and stays green...

So if you put 5V with your external power supply it works??

http://pastebin.com/UTPtTbSU

As I aspected there was corrosion under the MCP. I reflow the chip and tadaaaaaaa machine works again ! :) Thank you all for your hints! That was a good challenge for the weekend. Seeing back I wouldn't do it again. I had to sacrifice almost a hole donor board and I had to fix over 30 traces ...

Back in my ingeneering studies I learned something about machining, tools and materials. The harder the tool is the less force is required to cut through softer materials. Since the tool is able to cut through steel it needs absolutely no effort to clear of the solder. The pads see no shear...

No Title YES I ment MCP :) The board is now clean and charges the battery, ONE-Wire circuit works. Traces by SPIROM U6100 look good Resistance to GND on L6995 is only 15K Resistance Y2810 Pin1 and 4 is open line :eek: