I'm working on an A1398 820-00138 where the fans are running at full speed shortly after the computer starts. HWMonitor tells me that the Heatpipe Outgoing air and the the Airport Proximity sensors are at 128 degrees. There is not an overheating problem. I checked the connections and voltages at Q5803 and they are 0.5v on pin 1 and 0.9v on pins 2/3. From what I can tell this is not out of the ordinary but I need to confirm that Q5803 is the heat pipe sensor in question. This board worked properly before I removed the board to repair a bent ground pin at the DisplayPort connector. There doesn't appear to be any damage around Q5803. Has anyone had an issue like this on any A1398? Is there a sensor on the RIO board that I haven't been able to find?
MacBook Pro aA1398 Fans at full speed
Collapse
X
-
Tags: None
-
Re: MacBook Pro aA1398 Fans at full speed
Could be a sensor issue. Try using ASD tool (if applicable for your model) to narrow down. -
Re: MacBook Pro aA1398 Fans at full speed
I did use the ASD and it told me that only the Airport Proximity was below value at -128. I can't even find an Airport Proximity sensor on the board. All of the other sensors test OK. It makes me think that something else is causing this. All other ASD tests passed.
Sorry, the board is an 820-3663 not a 00138. I'm woking on both boards and mixed this up.
The fans had been working fine as I tried to resolve an issue with the brightness control only on Big Sur. I pulled the board to repair a bent sheild pin on one of the Display port connectors, and when I put it back, the trackpad didn't work anymore and the fans started the gradual high speed increase to full.
I replaced the trackpad with a spare and now that is working again but the fan problem remains. I've ordered another trackpad to see if it makes a difference. This is very strange.Comment
-
Re: MacBook Pro aA1398 Fans at full speed
OK, so I did find the sensor on the board near the Airport card. On the schematic it's labeled as X29 Proximity. I was previously doing some soldering of the metal shield of J9510 right next to the sensor. I don't believe that I touched the sensor at all and it still looks OK. I may try a light re-flow of the IC to see if that will correct this.Comment
-
Re: MacBook Pro aA1398 Fans at full speed
A reflow didn't help and I was able to pull one from another board that I have. I didn't want to reball the chip so, because there are only 6 pins, I decided to just push it down into place like any other SMD IC, and it worked.Comment
-
Re: MacBook Pro aA1398 Fans at full speed
Hi
I have the exact same board as you as well as the exact same problem when my Mac presented these problems i opened up and disconnected/reconnected some connectors in hopes it would resolve but then suddenly my trackpad stopped working and the fans continued its high speed. I ordered new trackpad/battery/keyboard. The issue still persisted.
I'm still searching for solutions any ideas ?Comment
-
Re: MacBook Pro aA1398 Fans at full speed
Hi
I have the exact same board as you as well as the exact same problem when my Mac presented these problems i opened up and disconnected/reconnected some connectors in hopes it would resolve but then suddenly my trackpad stopped working and the fans continued its high speed. I ordered new trackpad/battery/keyboard. The issue still persisted.
I’m still searching for solutions any ideas ?
Hey ACS-Repair did you get this one fixed?Last edited by Simplebeans; 02-08-2022, 03:13 AM.Comment
-
Re: MacBook Pro aA1398 Fans at full speed
Hi Simplebeans. I did get this fixed. it was an issue with the X29 sensor located near the Airport card. I suggest downloading and running HWMonitor for Mac. It will tell you right away which sensor is the problem.Comment
-
Re: MacBook Pro aA1398 Fans at full speed
Nice one ACS-Repair! I didn't have this issue myself i was just checking in to see if i could have helped.Last edited by Simplebeans; 02-16-2022, 02:59 PM.Comment
Related Topics
Collapse
-
by zaler808Hi guys, this my first post but i want to be brief about it, i recently got a MBP L2013, the problem was that after some use the macbook shutted down randomly, at first i suspected to be the battery, and after connecting it with the charger i noticed that i didn´t shut, but after an hour or so it shutdown, after that i started searching a solution to my problem, but my brother tried to help me to find the problem and it that process to replicate the problem he reproduced a 4k video in multiple tabs and not much time after the macbook shutdown to never power again, what i noticed was that the...05-23-2024, 05:17 PM
-
Macbook A1398 - had repeating loop of startup chime with no actual boot. Just startup chime, then restart, start up chime, then restart, etc. I pulled the battery and cleared BIOS. It will now power up, fans on, CPU warming, but no startup chime and no boot. I reflashed the BIOS chip but the same thing happening. Where should I go from here?06-14-2023, 11:45 AM
-
Apple MacBook Pro 15'' A1398 X435 051-00330 820-00138 Schematic & Board View
A1398 main board resistance measurements (user submitted no further details)...-
Channel: Schematics and Boardviews
10-01-2024, 06:58 AM -
-
by fishaHallo everyone, my A1398 do not charging the battery and the battery also do not bin recognized. I did all the reset work, SMC reset and all the other reset options but nothing helped. on the SMC at pin 2 (DCIN) there are 20,4V coming in. at pin 16 (BGATE) which goes to the Q7155 Gate there are only 11,43V. at the pin 1,2 and 3 on the Q7155 (Source) there are 12,23V. Cap C7126 is not shorted. As I understand, the gate voltege have to by higher then the source voltege for the gate to clous so the battery can be charging, am I right? can someone help me with this? I guess that manny models are working...
-
by PITERPENYHello everyone. It works very slowly and the fan spins very fast. The touchpad was flooded. I replaced it but the MacBook is still very slow and the fan spins at high speed. Resetting and bypassing SMС does not help! Please tell me what to look for.
- Loading...
- No more items.
Comment