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Got this sorted out, there are 2 filters, then 4 caps behind each pair of connectors that look like they are all laid out in pairs. Leading to these are tracks from an IC and measuring the 2 filters then 4 caps and comparing them to the other pair, the 4 caps were nearly shorted to ground and...

Hi, Thats what I thought. Thanks again.

Diode mode Red on ground black on each side of the cap it is 0 Black on ground red on each side of the cap it is 0 Beep testing Black on ground and red on each side of the cap 2.5 Ohms Thanks

Computer is liquid damaged, after cleaning it gives green then red light, no fan spin though. Found a short on PPVCC_SO_CPU. Looking at the schematic there looks to be many caps, the processor and C1031. Is there anything else that could be on that line causing the short or is it the processor...

Hi, Thanks for the information. I will check it out then update.

This is a long shot, but does anyone have a schematic and board view for 820 3228 from a Mac mini. Originally borough from eBay with usb ports not working, 2 then came back to life and work. I have fixed things like this on macbook pros before so will be looking for similar issues which are it's...

Thanks for the cap names, caps checked. Found no problems with them when checking them with red to ground and black on either side of them. L6995 removed injected 3.42v on pin 2, no green or red on charger, no fan spin. PSU gives current draw of between 1.5a and 2.5a. Board gently getting warm...

Changed the flex and all is OK now. Done

No liquid damage no, I have flex for the track pad and new keyboard on the way so will be able to test more in a few days. In the mean time I will be checking connectors just in case.

Have a Macbook Pro Retina been brought with a trackpad that does not work at all and keyboard that doesn't work... sort off. If you try to switch it on normally from the power button - that switches it off, but on the log on screen the trackpad does not work and neither does the keyboard, BUT...

It can't, but it looks like something is dragging the voltage down or u6990 is not producing the voltage.

I can't find the cap the is on that line. What I have done is inject 3,3v at pin 10 of u6990 and it gave a current draw of 1.66a. L6995 after a few seconds was getting warm so I am looking at replacing that just to see what happens, then work up from there to find anything that might be dragging...

Hey, That got it, and it is working again. All good. Thanks again.

I have found the foam by J6955, I will look for the cap and voltage.

HI, thanks for the file. I will get it sorted then update the thread.

Link to .bin file is: https://dl.dropboxusercontent.com/u/67533935/imac.zip

Message understood, the sn is C02h5f41dhjf.

I haven't heard of that no. Where is that on the board? Thanks

Ive been thinking smc as well. Will reflow and check again. Computer isn't liquid damaged, but wadda you do.

What is the name of the component I don't have the schematic yet.