Hi everyone, I have this Mac that had flaxgate problems, it was repaired, I noticed that the fans were running at maximum, I inspected and found the u 5860 torn away, recovered the chip on another main, I rebuilt the tracks, but now the fans don't turn really, if I unsolder it the fans go to max and the Mac is very slow, could I bypass this sensor? I attach the diagram+brd thanks
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Hi everyone, I have this Mac that had flaxgate problems, it was repaired, I noticed that the fans were running at maximum, I inspected and found the u 5860 torn away, recovered the chip on another main, I rebuilt the tracks, but now the fans don't turn really, if I unsolder it the fans go to max and the Mac is very slow, could I bypass this sensor? I attach the diagram+brd thanks -
I think the best suggestion is to review the reworked areas. If the Mac is slow, then the sensor is not being properly detected so the CPU speed is being throttled. It is also possible that the fan is not properly spinning so the CPU speed is being throttled. U5860 has its own I2C bus address. Was the replacement part 100% the same as the original? The I2C node address for this thermal sensor is defined by the A0/A1 strapping pins. Can you confirm the connections are present for A0 to ground. A1 is floating. If not, then the I2C address will be something else and this condition will also cause the sensor to be found and then the CPU speed will be...throttled.
You can attempt to run diagnostics on the logic board which should offer clues on which sensor (most likely this one) is not being detected. -
I checked the connections again and they all seem correct, A0 to ground, A1 not connected, I recovered the spare part from a 820-01949 board, looking at the diagram this is U5850 TMP461-S, could this be the problem? The diagram instead of my sensor gives me TMP461 without the final sComment
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According to the 820-01949 schematics, the I2C bus address for U5850 is the same so this should have worked ok.
Carefully measure the voltage to ground of:
SMBUS_SMC_3_SCL
SMBUS_SMC_3_SDA
Each should be ~3v unless one of the lines is stuck. If stuck, the sensor cluster cannot be pinged and will cause the CPU speed throttling.Comment
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I carry out measurements and update, I noticed that the SMBUS_SMC_3_SCL and SMBUS_SMC_3_SDA line between u5860 and u5850 measure 8 ohm and 3 ohm on the common points, if I disconnect the flat trackpad the fans start to spin quickly and the Mac slows, if I connect the fan remain stillComment
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Requested the voltage of the SMBUS lines but it appears the trackpad sensors are absent when removed so the fan spin is high and CPU speed is throttled.
Run the diagnostics to check which sensors are failing.Comment
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here SMBUS_SMC_3_SDA 3.3 v SMBUS_SMC_3_SCL 3.3 v all connected track, battery etc, when turned on there is no rotation of the fans, I ran the diagnostics and it is without errors, the fans started to turn first the right one then the left one, but when I turn it on the fans remain stopped, I don't think it's normal, can I check something else? thanks
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The fans only spin on these models when needed. If you boot and hold D the fan will be spun up and tested for tach etc during the test.
It's rare to see a fan not spinning on an Intel machine though, as they do run very hot. That's why Apple ditched Intel CPU's in their MAC's.Comment
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I was going to say that fan spin is not instant on these models. It needs to turn on when it gets hot, Intel chips run hot and are crap now compared to the M series chips. Hopefully you fixed it and don't need to do anythingsigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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PruebaComment
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Got a new victim:
AcuRite 5 in 1 Iris outdoor weather station not updating the temperature / humidity anymore. The original sensor is a SHT21. Also there are identical other sensor manufacturers. I chose the HTU21D to replace the original SHT21. Both have identical specs. I've had two failure modes with these sensors.
A: outside temp stuck at -40?
It's cold here at times in Canada, but not that cold!
B: stuck at some temperature and maybe updating once in 12 hrs or so.
Easy solution is to go to AcuRite website and purchase the sensor. Right?...
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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 -
A2442 hinge sensor has liquid damage, not possible to repair, is there any alternate?...
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Hi,
I just replaced the battery on a Google Pixel 5.
After that the proximity sensor isn't functioning properly any more. It is constantly activated. So when playing a voice message on Whatsapp, the Screen instantly turns off.
Checking with a sensor app I can verify weird behavior of the sensor. It is triggered when nothing is near and sometimes works correctly when squeezing the phone next to the sensor hole.
The rubber seal is on again (as mentioned in various suggestions in other forums).
This smells like a cold or broken solder joint. So I'd like to reflow... -
Hi guys.
Got a customer MBP 2020 which has a dad of corrosion from condensation, resulted in no power at all.
I replaced the corroded components and repaired the traces. Restored power and now Iccan get to login screen.
But when the CPU gets warm (not hot) and fan gradually starts spinning faster and then MBP turns off. Pressing power button turns it back on for couple of seconds then it turns off again.
Seems sensor related, but it won't even let me get as far as running the built-in ASD.
I can get back to you later with the components...
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