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Hi Duke, Apparently I don't have a scope. I tried checking it with a Multimeter on VDC and there is a couple of changing figures, which finally settles down to 0.0000v. I am using a 85W ORIGINAL Power adapter would that make a difference. I would need more help with your statement "Check all...

Hi Duke, Apparently I don't have a scope. I tried checking it with a Multimeter on VDC and there is a couple of changing figures, which finally settles down to 0.0000v. I am using a 85W ORIGINAL Power adapter would that make a difference. I would need more help with your statement "Check all...

Hi Group, I have a 820-2936 -B logic board where when I plug in the charger I get the green light but the fan does not spin. I tried measuring all the components with PPBUS_G3H, and everywhere I get is 12.56 volts. Also on further measuring the power rails I found the following that PP5V_S3...

Hi Louis / Duke and everyone in the forum. The trackpad was changed and the computer worked absolutely fine. CASE SOLVED. Thank you everyone once again for all your support.

Hi Louis, I watched one of your videos in which it is mentioned that the PICKB_L, if it has a low voltage than 3.3 then it is a problem, so I checked the PICKB_L and it is getting 3.3V. Where are the other areas that I can troubleshoot or should I try changing the trackpad to see if it is the...

Hi Louis, The computer is working absolutely fine. I run the ASD Test and the sensor did not show up any error. There is one situation that the trackpad does not click. The tap works but the click does not. Could it be the trackpad itself or something else. Can you please advice. Thanks.

Hi Louis, I did the following : Checked if U5400 was getting 3.3v on pin 3 and yes it was getting 3.3v - so does that still indicate that U5400 could be bad. Secondly I checked the area of R5409 which I see in there, but I observe one weird thing is that the R5369 that resistor is not to be...

Hi Guys, I did the following as well. As was recommended by Louis that a bad battery would also cause this problem, so I disconnected the battery and just boot the system on AC Adapter power. Even after turning on the system on AC Adapter I get the same error of IC0R and I also run the ASD OS...

Hi Duke and Louis, As advised I ran the ASD 3S155 and here is the error I get " Sensor - Current (IC0R) -- Computing (test 1) - Sensor Reads Within Operating Range - Voltage. - Check to ensure that sensor reads within operating range ERROR - Sensor is reading above the high limit -T E S T F A...

Hi, As advised by Duke and Louis that I need to download the ASD and run it on the machine, but the problem is that download it taking for ever. I was able to download ASD 3S162 but when I run it on the machine of Early 2013, it says it is not supported. I kept 3S155 to download yesterday...

Hi Duke / Louis, Can you guys send me some link to download the ASD EFI - 3S155 and 3S162.

Hi Louis, There was a CA3E..... number on the logic board which I googled it and it showed up that it is a 820-3462. I checked the U5400 area and nothing looks corroded. Can you please advice further troubleshooting steps. I know I am not good at this, but learning. Please advice.

Hi Duke, I have downloaded ASD 3S162 via torrent, but I am unable to mount it on the external hard drive so that I can run it on the effected machine. Please guide me, if I am doing anything wrong. As I a aware of the Apple Hardware Test which is done by pressing the D key at startup, which I...

Louis, I am still not able to locate the Board number on the board. Is there anyway you can help me locate the same. As I am unable to locate the board number, I am unable to follow your advice to check U5400.

The computer came on normal. That means it was just an issue with the PRAM. Thanks for your help Duke.

Wow i see a folder with a question mark on the screen. The hard drive is out of the system, so i Understand that the folder will go away, when a hard drive is installed. Looks like the problem is solved. But let me put the logic board and all the cables together and test the system to see if...

I tried doing a PRAM reset, but I don't think that worked. Also one thing i observed is that the computer only comes on when connected with the adapter. On battery power it does not come on. I am not sure what %age of battery is charged as I cannot see anything on the screen.

Hi Duke, Yes it does chime. In reference to the mouse light, when the mouse is plugged in to the left side USB port ( next to the DC in board ) the mouse light flashes rapidly and when the same mouse is plugged in to the right side ( next to the HDMI ) port it does not light up at all. When a...

Hello, I got a 13" Retina Display computer that does show anything on the display. The logic board is 820-3476. When the adapter is plugged in the light on the adapter comes on and the fan spins. On inspecting the logic board I see that Q8150 is corroded. Other than that the logic board...

Louis, I shall open the board tonight and get you the feedback by tonight itself.