Re: A1398 820-00426-A Fans spinning max and very hot heatsink
Hello piernov,
thank you very much for your detailed analyse of the diagrams. Here is what i did with the machine the last days:
I always use the thermal paste MX-4 from Arctic - i hope/think it is a good one. i renewed it two or three times in the last weeks - so here i had nothing to do.
I did a complete new installation with Big Sur Beta (V11) like you told me - without any apps who are running background tasks. The machine runs now much more better than before. I think your guess...
mbcontrol
Member
Last Activity: 02-26-2025, 02:03 AM
Joined: 04-26-2020
Location: Bad Schussenried/Baden-Wuerrtemberg
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Re: A1398 820-00426-A Fans spinning max and very hot heatsink
Hello piernov,
You are right, i also see no palm rest sensor shown in HWMonitor. I installed the version you gave me in english. See also the Screenshots in the attachments. Should i find this sensor in the schematics of the 820-00426? I can't find there a Ts0P or Ts1P. If it is on the trackpad, is it connected over J4801 to the logicboard (ScreenShot of J4801 in the attachments)? Can you explane me how to find and measure this sensor?
The Apple Diagnose didn't find any issue (Reference Code:...Leave a comment:
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Re: A1398 820-00426-A Fans spinning max and very hot heatsink
Hello Piernov,
Thanks for your reply. So the ampere usage of my 00426 with 1.2 to 1.3 A at the end could be normal? The next time I switch it on, I log the values more precisely than I have done yet. But it looks plausible, does it?
I uploaded a HWSensors Screenshot that i created a view weeks ago (sorry it's German - i can create a new one in english if neccessary).
There is a value with permanent 129°C named "Grafikkarte 2" (Graphiccard 2). What does the 129°C mean?...Leave a comment:
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Re: A1398 820-00426-A Fans spinning max and very hot heatsink
Hello,
Maybe i found a fault on PPVCCIO_S0_CPU. I measure a resistance of 8 Ohm to ground. When i measure it on donor boards (without CPU on it) i get a value of 4.8MOhm. I only have donor boards to compare.
I desoldered and checked the components connected to ground on this rail. This components are C7279, C1079, C1800 and C1801. I still measure 8 Ohms to ground.
Measureing the resistors on this rail not connected to ground, gives me (i think) plausible values ...
R7279 and...Leave a comment:
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Re: Beginner's guidelines
Very helpful for less experienced people like me :-)
ThanksLeave a comment:
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A1398 820-00426-A Fans spinning max and very hot heatsink
This MBP 15" Retina (2015) is running normal. The only problem is that the fans are often spinning maximum without any hard work for the cpu.
I've already invested a lot in troubleshooting and can't get any further. I don't find any voltage errors or errors in the data lines. So far I haven't found any defective resistors or capacitors.
I have already changed the following parts on the board: U7090 (LT3470AED), C7099, C7094, U7100 (ISL6259AHRTZ).
I renewed the thermal paste and cleaned the board in the ultrasonic cleaner.
I have no experience... -
A1502 restarts with battery connected (without battery no problems)
Hello everybody,
I'm working on a A1502 (820-4924A) that keeps restarting when the battery is connected. I've already tried a new battery. The problem also exists when the charger and the battery are connected.
Without a connected battery, the machine runs without problems.
Sometimes he brings a message like "Your computer restarted because of a problem". Most of the time he restarts without any message during booting up (endless loop).
Does anyone have experience with such a fault?
Thank you for every tip. -
Re: A1259 820-01598 sticks to the logo (water damage)
Hi piernov,
thanks for the tip, I could have figured it out myself. I was so deep in the troubleshooting tunnel :-(
I tested it with an installation stick for HighSierra - it boots without any problems.
A few things still need to be fixed - e.g. Audio doesn't work right now. But I think I've already seen the faulty corroded areas for it.
I will continue to work on the board and hopefully fix any bugs.
Thank you for your help, piernov.Leave a comment:
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A1259 820-01598 sticks to the logo (water damage)
Hello everybody,
I'm working on an 820-01598 with water damage. I've already done a lot on the board ...
it started with the power supply was only delivering 5 volts - the 20 volts were missing.
There was a short to ground on PP3V3_G3H_RTC below J6700 PIN15 (keyboard-connector). I had to go 5 or 6 layers deep to remove the short circuit. To PIN15 (PP3V3_G3H_RTC) I pulled a wire bridge.
Since this work, the power supply is delivering the 20 volts and the Macbook starts up (i have only connected the display and charger for the tests). However,... -
Re: A1259 820-01598 is a pulsing voltage on CHGR_BGATE normal?
Thank you piernov, that's what I suspected.Leave a comment:
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A1259 820-01598 is a pulsing voltage on CHGR_BGATE normal?
Hello,
i am working on a water damaged 820-01598 and have a short question about the voltage on line CHGR-BGATE from U7000. The board is out of the machine and nothing connected.
I measure pulsing 12,6V and 4,8V every 2-3 Seconds.
Is this normal?
(Boardview and schematics is available - but I think it's almost the same circuit as with older boards with U7000)
Thanks for any help. -
Re: A2159 MacBook Pro (13-inch, 2019) 820-01598-06
[attach]217637[/attach]...Leave a comment:
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Re: A2159 MacBook Pro (13-inch, 2019) 820-01598-06
the brd is available on ******************** - but unfortunately only for Content Type: VIP II (Corporative Membership Only) - i have no account :-(Last edited by SMDFlea; 08-09-2020, 07:36 AM.Leave a comment:
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