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Hey Duke, I finally got a solid green light after after replacing U7000. The only crappy part is that my fan doesn't spin. I re-measured everything and notice that PPBUS_G3H was only 2.26v instead of 12.8v. Any idea what can be causing this? can a short in a different power rail cause the...

Thanks for the help guys :) Let me know if you need me to take any other measurements. 1) Not sure. It just appeared before following dukes suggestions of injecting 3.42v from a external PSU. I'm happy to say that I have PP3V42_G3H at L6995. Green light appears dimmed thou. 2) I get 3.81v at...

No Title So i have manage to get PP4V42_G3H (3.46v) but now Im missing PPBUS_G3H (0.30v). I have 17.08v at PPDCIN_G3H. When I connect the charger to the macbook I get a fainted green light. My resistance to ground on PPBUS_G3H on the bad board is 18.05 mega ohms . It looks like my problem...

Thanks for the clarification louis. Was just confused; sometimes i over think stuff. To answer dukes question my resistance to ground on pp3v42_g3h is 569 ohms.

Thats lame which one do you use? This is the same multimeter we used at his class _- just trying to learn

No Title Hello duke, thanks for your response. Sorry i didnt take the reading correctly. Do u mind telling me how tp take it properly? Is it suppose to be like the pic attached? If this is true, my reading is 0.569 ohms

No Title No beep at probe 422 of PP3V42_G3H. If i put my meter in diode mode, my black probe on PP3V42_G3H and my red on GND it gives me the value of 0.260. Since i needed a stable 3v42 i decided to take some measurements on U6990. It looks like PP3V42 its not being produced by this ic.

Hey Guys, I got a 820-2936 that came in with no power and no water damage history. When I connect the charger to the macbook it flashes green and orange very rapidly. I checked the main power rails and got the following readings PPBUS_G3H 0.45v, PPDCIN_G3H 17.06v, PP3V42_G3H 0.02v. I did some...

Hello Duke, I was able to remove the short on PP15v_T29 by removing the big cap C3897 near the u3890 ic. whats the purpose of this circuitry? Do you think its acceptable to return the board to this customer at this point? Everything works properly it just gives me that stupid error "OS X could...

to be exact, U9480 gets really hot. Should i bother fixing this circuitry? What do you think i should about the installation problem? Should i let the customer figure that on his own?

Thanks for your response. I tried setting the date to todays date and reinstalling the os but i still got the same error. At this point, im not sure if i should spend more time on this since the customer only paid me to fix the dead board. Shouls i let him figure this out Whats your opinion? I...

larossmann dukefawks Can we reppen this post? I just got another board with the same problem and readings. Thanks!

What are you verifying with this? Sorry if it sounds stupid

Thanks for your response Duke. When I boot from a usb drive and install on a known good HDD, I get the following error "OS X could not be installed on your computer-File system verify or repair failed. Quit the installer to restart your computer and try again". It's weird the disk gets listed...

Hey Guys, I have a water damage mac book pro that came in completely dead with a fainted green light. I was able to make it turn on by removing the short on PP3V42_G3H. Now when the computer boots up it flashes a question mark non stop. I already tried a new HD cable but I'm still having the...

Hey Louis, here are my readings for u7200 VIN 12.57v, EN0 2.98v, ENTRIP1 0v, ENTRIP2 0.85v PGOOD 0v. Ilex me know if you need any other ones. I have recently changed q7221 but no luck. Thanks for giving me a hand 23 continuity to gnd

GOOD NEWS!!! After replacing TPS51121 with a donor ic and injecting the 5v into 5V_S3 we have a spinning fan. It's time to find out why I'm missing that voltage. Any idea? If I'm not mistaken this line gets created by u7200 so this should have addressed this issue. I think my q7221 is not...

Sorry duke! I couldnt control myself. It seems that u7200 was shorted. When i removed this ic i was able to inject no more than 3 v into this line without any consumption. I think ill Be able to restore pp5v_s3 after replacing this chip. If this is the case ill be a happy guy. Can i salvage this...

hello duke, you are correct I'm also missing ALL_SYS_PWRGD. I'm a little bit confused thou! Hopefully you can clear up some things. At the moment I don't have 5v_s3. I tried injecting 5v into this line to see if the computer starts up and it consumes 0.24amps. I noticed that u7200 is getting...

Should I measure it when I'm inject 5v into 5v_s3?