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Hi Duke, You can mark this as SOLVED, as changing the power supply on this iMac solved the problem of it shutting down when it was trying to boot. I would probably say that 27” iMac of Late 2015 have a signature problem of power supply failures. Thanks for all your help. Regards, Raj.

Hi Duke, When the SATA DATA cable is disconnected the DOES NOT shut down, but while the fan is still on and the SATA DATA cable is re-connected, the fan stops spinning and the complete system just stops.

Hi Duke. On further stressing my brain, I feel that the power supply could be a issue. The reason why I say the power supply is because if the HDD cable is unplugged the computer fan does not stop, but moment the HDD cable is plugged in, probably the power needed by the HDD to spin is not been...

Hi Guys, Here is what I did. I opened up the computer and as JohnB8812 doubted the Hard Drive, I went ahead and detached the HDD Sata Cable from the Hard Drive and turned the computer ON, expecting that the computer would show the folder with a Question Mark. The computer FAN was ON, which...

Tried booting with an external HDD, but as I have explained in my original message that it starts but ends up with the message “ Your computer restarted because of a problem. Press a key........ then the computer shuts down.

Hi Team, I received a iMac 27" Late 2015 in my store last week. The issue with this iMac is that it starts up and as soon as the Apple Logo appears the progress bar reaches to almost 20% the iMac just shuts down. If i try to press option and turn the computer on, it stays at the HDD icon, but...

Hi Team, I have a MBP early 2015 A1502. When the computer power button is pressed the chime is heard but nothing seen on the screen. Customer mentioned that they bought a Chinese Charger as the original charger was not available in the store. Inspected the board and found that some solder...

Hi Duke, I was successful in fixing the Macbook Pro. I was able to run the ASD 3S162 EFI Test and in that test it was discovered a power sensor IPBR Sensor is reading above the high limit. I checked the schematics and checked the Cap and Resistor for the IPBR sensor, they looked normal, but...

Hi Team, Need help with this situation. This is my personal computer. Computer was working fine. Next day morning computer comes on but does not accept password. Keyboard types but computer does accepts password. Now here is what I have done so far. 1. Connected external keyboard and...

Hi Duke, Sorry for the mistake. My tech guy who works for me had a type error. The actual board number is 820-2936-B. We even tried connecting the Macbook Pro to an external screen and still we are getting a white screen. Tried booting with an external hard drive. No Results. Pressed CMD +...

Tried an external display however it makes no difference as the white screen is still present

820-3926 is a board number.

Hey guys, I have a 820-3926 here that has startup chime but, doesn't boot. I even tried booting with an external hard drive and also resetting the NVRAM, neither solved the issue, all it gives me is a plain white screen. Any further troubleshooting advice?

Mac Mini Late 2014. Model A1347 - EMC - 2840.

Hey guys. I have a mac mini here that plays normal sound through speakers and external display however, when earphones are plugged in, it shows that the earphones are connected but it doesn't play any sound through them. The I/O bezel and logic board seemed good, so i went ahead and set up a new...

Hey guys, I have a Macbook Air board (820-00165), there is no light on the charger nor fan spin. I proceeded to check the power rails, and realized PP3V3_S5 is missing. I also checked PP3V42_G3H, which is present despite of no light on the charger. Any further troubleshooting tips?

Checked U6100, U1950, and U1900. Only U1900 has some mild corrosion but, only on unconnected and ground pins. U6100 and U1950 are fine. However, power rails PP5V_S4 and PP3V3_S4 are missing. On further investigation, U8020 was found to be getting hot. Can you please advice for further investigation?

The resistance to ground on PP3v3_s4 is 8.70 k ohms. I checked R8000 and on Pin 2 - PP3v3_s4 is showing 8.70 k ohms. I am measuring resistance to ground by putting the Red probe to ground and black probe to the test point. Correct me if i am wrong in measuring resistance to ground. Please...

Thanks. Checked all power rails however, PP3V3_S3,PP3V3_S0, and PP3V3_S4 aren't present. Any further troubleshooting tips?

Hi Team, Received a Macbook Pro with board 820-3476. The green light turns on and then turns orange, but the fan does not spin. I checked ppbus_g3h and i get 12.58v. Can someone advice me further to trouble shoot this board. Thanks.