Hey everyone, so I have a 2015 820-00138 MacBook Pro in for repair that has been really been a pain. I replaced U7100 after a voltage rail issue from a water spill. Now the laptop turns on and runs, but fans ramp up to 100%. I can boot to the OS and ran Mac fan control and all temp sensors seem to be reporting correct. I sprayed each one with freeze spray and can verify the change to them. I replaced the FET that controls the fans with a known good one with no change. All temp sensors have continuity. I also removed the SMC and re-balled it and put it back on with no change in fan behavior. Board is running with bare minimum just both fans, no trackpad cable, no camera cable just to rule those out as possibilities, I also disconnected the RIO connector with no success. Hoping someone may have some insight in where to look next. Thanks in advance!
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Re: 820-00138 High Fan
There is a temperature sensor in the trackpad. You must have a working cable without corrosion connected. Do ASD tests and see which sensors it reports. -
Re: 820-00138 High Fan
Thank you @mayss. Now that you say that I took a closer look at the trackpad. I replaced the top case of this computer with a refurbished one and looks like some of the components were knocked off the trackpad board by the refurbisher. This may explain the issue. I will have to get another trackpad and test this out again to make sure fans return to normal again. Unbelievable, I was trying everything and diving way too deep on this! Need to start with the simple things first. Thank you!Comment
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Re: 820-00138 High Fan
@Mayss so sure enough you were right on the money, swapped the trackpad out and now fans are back to normal, thank you for the assist on this one! I hadn't looked close enough at the trackpad until you mentioned this.Comment
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Board powers on and display turns on, battery holds charge, I know the trackpad is the issue, replaced the trackpad with new M2 trackpad and cable since they were burnt, also replaced the connector on the board good as new, pins are getting power, however since I do not have the schematic for this and cannot seem to find it, can someone point me in the right direction to get this trackpad working and also maybe provide a M2 A2338 schematic?
I have no power on these pins so far
7,11,12,27, 29,41
pin 25 is .5volts which is low. Need schematic to pin point the short so I... -
Hello guys. I have a problem with a PNY XLR8 GAMING RTX3090 graphics card. The problem is that it displays and works fine, but the fans don't spin at all. The problem occurred when someone else removed the fans in order to clean it and broke one of the fan connectors. He replaced it himself and after that, it wasn't working anymore. I guess he damaged something else in the process. What i have done so far: I found 2 capacitors next to the connector that were in a bad shape, he must have touched them with his tools - they weren't shorted, but i replaced them with similar ones from a similar card....04-12-2024, 06:54 AM -
Hey everyone,
Usually, I'm not the type to ask for help, but this time, I'm calling on your wisdom and expertise
I've seen what this community can do, so I'm pretty sure you guys can help me out.
Here's the deal: I noticed my MacBook got stuck in a boot loop. After opening it up and doing some initial troubleshooting, I found that the boot loop stops only when the trackpad is unplugged.
Now, just so you know, the trackpad actually works — I tested it with another motherboard and it's all good. Same for the cable, no issues there. The problem is only... -
Dear colleagues,
I've entered the repair of the chromebook machines just one month ago and I've found some significant differences from the classic laptops or macbooks, so I'm searching some advices.
The owner of this chromebook gave it to me after it has been left flooded by water for almost a week, so chances of repair were not so high, the mainboard was oxidyzed in many spots but I made a nice cleaning, resoldering and component replaging work and now it is almost working.
Among other things I've cleaned many spots from oxyds, reballed CPU, EMMC, EC, replaced...05-07-2025, 06:10 AM -
Hi Guys,
This Mac come with dead issues (severe water damage), now it’s turning ON except Trackpad and Keyboard not working.
Already check and write down DM for JT400 and JT201 don’t find any abnormal value (I don’t have unit for compare).
Already try,- Replacing Trackpad Flex Cable
- Replacing New Trackpad
- Replacing Little Board (Daughter Board)
- Try using New Keyboard
So I check “Power Load Switches” and this is all the numbers,
UC830 > 1 = 3.297V ; 3 =1.757V ; 4 = 3.798V...07-08-2025, 05:19 AM
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