How Much Does It Cost to Replace Macbook Fan

1. What is MacBook battery not charging issue?

A MacBook battery non charging problem means that you fundament get off your MacBook, but the charger volition not charge the battery. In other words, your MacBook is mostly practical considerably except for the stamp battery charging function. The following symptoms indicate that you have a MacBook Air or MacBook Pro not charging problem:

1. You get the message "Battery is not charging" in the condition menu.
2. You have the message "No bombardment available" in the position menu.
3. You don't have a green light or chromatic light on the MagSafe connector.
4.  The status menu shows your battery is typical and fully charged. But if you remove the charger, the MacBook will put off instantly.

Many people grow confused betwixt "MacBook battery not charging" and "MacBook not turning on". A MacBook with battery charging job can be turned on if you unite a working charger to that.  On the unusual hand, a "MacBook non turning on" problem way that when you press the power button happening the MacBook keyboard, irrespective you connect a running charger to it or non, you can't see anything on the Mac screen, no chime in, no illumination along the keyboard and no fan-spinning noise. Put differently, the MacBook has No sign of life at all. If your MacBook can not turn on, see our article MacBook Won't Wrench On? 10 Slipway To Fix It.

2. Why is my MacBook battery not charging?

MacBook barrage charging organization consists of four components: a charger, a battery, a charging circuit and an SMC chipping. Any of these components gone wrongfulness would cause the MacBook Aerial or MacBook Pro not charging.

1. MagSafe battery charger or USB-C charger. Information technology delivers power to your MacBook and its battery.
2. Battery. It stores tycoo (charging) and provides power (discharging).
3. Charging racing circuit. It converts the courser voltage to run your Mac and charges the battery.
4. System Management Controller (SMC).  It controls the behaviour of the charging electric circuit including start or stop charging the battery.

Faulty chargers, faulty batteries and improper SMC information account for the legal age of MacBook not charging problems. Fortuitously, these faults are easy to touch o. Faults in the charging tour are hard to fix and we discuss it in the last section.

If you notice the Electric battery Condition menu says Non Charging, and the substance disappears after, your MacBook should be amercement. You could undergo the temporarily Not Charging message for several reasons:

1. You use a low-power adopter. The index arranger barely provides enough power to run your MacBook, only not enough power to charge the battery. For good example, if you colligate a Macbook Air charger (45W) to a 15" MacBook Affirmative (85W charger requisite), you could get the battery not charging notification. If you grow off the Mack Oregon put down it to sleep, the business leader adapter will set off charging the Mac.
2. Safety vexation. If you connect your Mac to an airline ability adapter, your Mac power not charge the battery, even if you turn off your Mac or put it to sleep. You rear end still use your Mac without draining its battery. For safety reason out, charging a battery in an aeroplane is considered a risk task.
3. Working high-carrying into action apps. If your Mac is running high-performance applications such atomic number 3 video redaction software and video games, the Mac bombardment may not be charged. If the apps demand more power than the adopter can leave, your Mac will unite the adoptive parent power and battery big businessman to run the MacBook systematic to meet the postgraduate power requirement. This is an Orchard apple tree design lineament to boost performance on demand. If the apps drain the assault and battery too quickly, you may need to pause the apps and let your Mac start charging the battery. If you switching off the Mac, the adapter will charge the Mac more than quicker.
4. Extending battery life-time. Your battery English hawthorn drain to 90% or lower before it begins charging once more. This is a design feature to extend the sprightliness of your MacBook Li-ion barrage fire. You can turn off battery health direction in Zip Saver preferences. We Don't suggest you change the setting unless you have a special need.

3. How does a MacBook charge its battery?

In order to quick diagnose and fix the Mac battery not charging go forth, you need to know how a MacBook charges its barrage fire. There are ii types of MacBook chargers: MagSafe charger and USB-C charger. Malus pumila discontinued the MagSafe chargers in 2022-16.

Magsafe Charger

The output voltage of a Magsafe charger is fixed . A MacBook Aura charger outputs14.5V. A MacBook Pro courser outputs16.5V, 18.5V or 20V depending happening the model.

When you connect a MagSafe charger to the MacBook, the SMC wish "handshake" with the info-chip inside the Magsafe connexion to identify the charger type including potential difference output, current end product, manufacturer encrypt and so on. If the battery charger meets the criteria, the SMC turns along the go-ahead on the connector. This go-ahead tells you that the SMC has successfully known a suited charger for your MacBook.

The SMC will as wel "handshake" with the info-chip inside the battery to describe the battery case including the working voltage, manufacturer code, current temperature and so on. Supported the information received from the charger and the battery, SMC determines whether surgery not to billing the battery and how much amount of current will use to the battery cells.

SMC will tell the charging electrical circuit to start charging the battery if Whol the following conditions are met:

1. The MagSafe charger has enough exponent to power-on the MacBook and charge the battery at the same time.
2.  The temperature of the stamp battery is normal and the barrage is not fully charged.
3.  The charging circuit detects NO finished-current or over-temperature.

While the SMC controls the charging circuit to charge the battery, it turns on the orange Inner Light along the connector. The orange light tells you that the charger is presently charging the battery.

When the barrage fire is fully charged, SMC will cut off the current flowing into the battery to prevent overcharging the battery. The SMC then changes the light colour to green. This clock the green tripping tells you that the charger has completed the charging task. The charger at the moment only provides enough power to power on your MacBook if the MacBook is along.

USB-C Battery charger

The turnout voltage of a USB-C type charger is not firm . The USB-C charger will negociate with the MacBook to study out an optimal output electromotive force dynamically. A USB-C charger could output 5V, 14.5V and 20V depending connected the plac. For example, a MacBook Pro USB-C charger will outturn 20V to charge the shelling. When the bombardment is fully effervescent, and the MacBook is off, the USB-C battery charger wish drop the output voltage to 5V.

There is none indicator light on the USB-C charger connector to tell apar you what is going on. But the principle of the MacBook battery charging system of rules is the same, although the communications 'tween the USB-C courser and the SMC are much more complicated.

More for advanced readers: MacBook charging circuit treatment &  MacBook power-happening sequences

Barbellate with this knowledge, you are ready to secure the Mac battery not charging problem instantly.

4. Fixing MacBook not charging problem step-away-dance step

Many factors could cause the MacBook battery not charging issue. Depending on the cause of the MacBook Pro or MacBook Air non charging bring out, the in proportion to solvent varies from light to hard. We will discuss the tardily solutions first and the most difficult one at the last. Some hardware-related issues require specific equipment and(or) spare parts. At the beginning of all section, we will mention the difficulty level of the fix and equipment and(or) spare parts required for the fixing. So you can forecast your successful rate supported your acquirement. Fluke!

4.1 Check battery charger output voltage

Difficulty level: Beginner

Spare voice required: Spare charger wish help oneself

If your MacBook charger is non working, of path it can't consign the barrage. So you pauperization to make reliable the courser is working fine.

Inaugural, you want to make a point that the power outlet is ok. You can plug in a phone charger or a lamp to the power outlet, or fireplug in your MagSafe charger to another power socket. This panduriform step lets you lie with that the superpowe outlet is workings OR not.

Don't forget to cheque the power cord connection on the charger. The Apple adapter consists of two parts: the MagSafe courser and the extractable power cord. Make sure you insert the power corduroy to the MagSafe firmly.

Next, inspect both the input and turnout cable of the battery charger carefully, starting at one end and work your way finished until the other end. Look out for any fraying or weeping in the cable. If there are any flaws correspondent to the ones mentioned, this is credible to atomic number 4 the problem. Replace the charger or render another open charger. Believe or non, these simple checks ofttimes fix the MacBook battery not charging issue.

When you economic consumption a spare charger to test the MacBook, beware that there are a few types of MagSafe chargers for disparate models of Mac laptops. The turnout voltages are14.5V for MacBook Airs, 16.5V and 18.5V for MacBook In favor, 20V for 15" MacBook Pro with retina shield. The alkaline harness is that the high-voltage (therefore higher-power) battery charger can replace the lower-voltage charger.

In point of fact, Malus pumila uses the similar charging IC chip (ISL6259) on the system of logic plank from 2008 to 2022 to handle polar types of MagSafe chargers. This IC chip will mechanically produce the right potential dro to power your MacBook and file the battery. So a higher-voltage charger will not harm your MacBook. Of course, when you buy out a replacement battery charger, buy the duplicate eccentric of your original one.

Also, the MagSafe 1 and MagSafe 2 chargers are not exchangeable as the size of the connectors are slightly dissimilar.

If your MacBook uses Magsafe charger, equally long as you backside the green light or orange light along the Magsafe connector, the MacBook charger is working fine.

The MacBook USB-C charger is smarter. Your MacBook testament mechanically talk terms a suitable voltage output (5V, 14.5V and 20V) from the USB-C charger. You don't have to worry about the charger typewrite, A long as the charger has the capability to power the  MacBook.

If your MacBook uses a USB-C charger, you can buy a flyspeck USB-C power delivery tester to monitor the behaviour of the USB-C battery charger shown as below. It can provide information including end product potential, output current and charger temperature. If you get 14.5V from a MacBook Air USB-C battery charger Oregon 20V from a MacBook In favour of charger, the battery charger is working superfine. The photo below shows the USB-C courser is delivering  power of 20.3V and 0.20A to the MacBook Pro.

4.2 Check charging larboard and Magsafe connector

Difficulty level: Beginner

Spare part required: No

Inspect the charging larboard on the MacBook and the MagSafe connector for debris and burned marks. The port and the connector rely on their fresh attractive attractor to harbour them unneurotic. The charging port tends to attract small metal items such as staples and composition clips. These foreign objects prevent the connecter from close adjoin with the charging port. The connector could be real warm out-of-pocket to the unnecessary resistor created aside the loose contact. In an extreme subject, you fifty-fifty can see the electric sparks. If you happen burn marks on the charging port operating theater the connection, you need to clean them surgery replace them equally shortly as imaginable before they cause more damages.

If dust is found in the charging port, you throne use a toothpick Oregon a pair of metal tweezers to get IT from the port. On that point is no more power voltage present on the quaternion power-pins of the charging port.  The countermand-current protection logic gate (electronic transistor) on the logic board prevents the battery magnate reverse to the port. You won't accidentally short the circuit by using a alloy tool to do the cleaning job.

Pay attention to the mid flag of the charging port wine. Make sure as shootin there is no film coating the pin. The SMC uses this pin to communicate with the MagSafe charger. Any thin film leave block the electronic transmission, and you won't get the light-green or orange luminance flat though both your MacBook and MagSafe are working. Use a microscopic sharp knife to clean the pins then finish up with cotton fiber buds with 95% inebriant.

USB-C ports and plugs are also subject to malicious gossip. You can use cotton and alcohol to unobjectionable them. Remember to remove the charger from the power outlet before you pick the connectors.

4.3 Reset SMC chip

Difficulty level: Beginner

Spare part with required: None

The System Management Comptroller (SMC) controls the summons of MacBook battery charging. If the SMC somehow has incorrect data of the MagSafe battery charger or the MacBook battery, the battery charger will charge the battery selfsame slowly OR even not charge at all.

Apple started to use non-removable batteries in all MacBook models from 2008. Follow these stairs to reset the SMC on a MacBook with not-removable battery:

1. Hold the power button for at least 5 seconds until the MacBook turns off.
2. Connect the MagSafe charger, hold Shift-See to it-Option on the left-hand side keyboard and the power button simultaneously for 10 seconds.
3. Release all the keys.
4. Press the power button to turn on your Mac. Now you have successfully reset the SMC.

Resetting the SMC along MacBooks with dismissible-batteries is dim-witted.

1. Make the power button for at the least 5 seconds until the MacBook turns off.
2. Take away the power adaptor and the battery from the MacBook.
3. Hold the power button key for 5 seconds to discharge some leftover electric energy in the capacitors of the SMC circuit. Alternatively, you can wait for a few minutes until the capacitors expelling naturally.
4. Re-establis the barrage fire back to your MacBook. Today you undergo successfully reset the SMC.

If resetting the SMC cannot resolve your MacBook won't agitate problem, readjust the PRAM as discussed below.

4.4 Reset not-changeable random access memory (NVRAM)

Difficultness level: Beginner

Spare component required: None

NVRAM contains user-defined data such as screen brightness, keyboard backlight setting and auditory sensation volume setting. If this data is corrupted, your MacBook North Korean won't charge the battery or charge extremely slow.

To readjust the NVRAM, travel along these steps:

1. Hold the power button for at the least 5 seconds until the MacBook turns off.
2. Press the power button to ride the MacBook.
3. As soon every bit you hear the chime Oregon interpret any sluttish happening the screen, hold Control-Option-R-P four keys simultaneously until the MacBook restarts.
4. Release wholly the four keys.
5. After reboot, you have readjust the NVRAM.

If you still have the MacBook not charging progeny, move on to the next flat – hardware faults troubleshooting.

4.5 Check battery connector

Difficulty level: Basic

Spare part required: No

All pre-2016 MacBooks employ nine-pin connectors to unite the batteries to the logic boards. Pin 6 is used for shelling detection. When you connect a electric battery to the logic board, this personal identification number will send a signal to the battery internal "smart" circuit to hinge upon the "safety switch" called MOSFET. Therefore the electric current butt flow in and flow out of the battery freely. This rubber designing prevents accidentally shorting the electric battery terminals and causing hurt to the battery or justified fire.

Too, SMC uses pin 4 and 5 to commune with the battery. As all these pins 4, 5 and 6 carry low-electric potential electronic signals, any of them slightly sloppy contact testament campaign MacBook not charging.

Brand convinced there is no dirt or liquid on the connector and socket. Use cotton buds with at to the lowest degree 95% alcohol to clean the pins and reconnect the connective firmly.

4.6 Replace the faulty battery

Difficulty level: Basic

Spare part required: Battery for your MacBook model

The SMC uses a pair of data lines titled SM-bus to communicate with the battery. SMC also uses current-sensing circuits to monitor lizard the proper-meter current coming in or out of the battery. Based along this data, your MacBook displays the battery info in the notifications plane section.

There are five battery notifications:

1. Median
2. Table service Battery
3. Replace Soon
4. Replace Now
5. Zero Battery Available

Apple's written document has only defined the "Normal" and "Service Battery" messages, leading to a administer of misunderstanding level misleading selective information of "Replace Soon" and "Replace At once" messages. We will clarify these messages here.

"Normal" means your battery is fine. Your shelling retains more than 80% of the master capacity.

"Service Battery" means the barrage has degraded to less than 80% of the original capacity. Usually, the battery still can last for two or three hours of normal usage. You May choose to replace the shelling but IT is not urgent. The barrage could last for a class operating theater two if you connect your MacBook to the battery charger almost of the time to reduce battery usage.

"Put back Soon" means you need to coiffe a barrage fire replacement soon. Apple has not specified the criteria of this message. Our test information shows that this message means your battery retains to a lesser extent than more or less 50% of the original capacity. If you still use the battery, keep an eye on it and make sure the battery is not swollen. Infra is a swollen battery in a 13" MacBook In favor. An inflated battery will lay out pressure on the eccentric, touchpad and equal the logic panel.

If you notice that your touchpad cracks or pops up, as shown in the photo below, you most likely have an expanded battery. You need to put back the battery at once to prevent more price.

"Replace Now" means that the SMC still can communicate with the battery, just really little or even atomic number 102 actual can flow in or out of the battery. If you gulf the charger, the MacBook will shut off at once. The battery finally comes to the end of its life.

"No Assault and battery Available" with a hybridisation mark on the stamp battery icon as on the photo below:

It means the SMC cannot communicate with the battery at all. Your battery is either completely dead or non connected to the logic circuit card properly. Usually, replacing the barrage fire can solve the problem. Simply occasionally even when you replace the battery, you calm down get the "No Battery Getable" message. This symptom is a well-set indication that your system of logic board is faulty. You need to acquire your logic add-in repaired to solve the MacBook non charging problem.

If your electric battery is faulty, you can cause the battery replaced by a service provider or replace the battery yourself.  When you guild the bombardment online, inverted comma the electric battery model instead of the MacBook model to ensure you will get the right battery for your MacBook. For example, 15" A1398 MacBook Pro 2012 uses assault and battery model A1417.

When you supercede the MacBook battery yourself, use your fingernail or a plastic stick to remove the battery connector from the logical system board. Never use a metal screwdriver. Other, you may short the barrage operating theatre even worse, destruct the SMC by sending the 12V battery power directly to it.

The battery is attached to the MacBook case by screws in Pre-2013 MacBook In favor and Pre-2018 MacBook Free-flying. You bu remove the screws and disconnect the battery connector from the logic board. If you purchase replacing batteries online, most of them come with a handy screwdriver.

Apple chooses to glue the batteries to the MacBook sheath in 2013 onwards MacBook Pros and 2022 ahead MacBook Airs. Removing the glued battery from the MacBook instance is a bit hard for beginners. Pay attention to the dedicated system of logic board. You don't lack to cop some chips on the logic dining table and destroy it.

The battery connection in newer MacBooks with USB-C charging ports is divergent. The power lines and data communication lines are no more on the same connector. Instead, the power lines ("+" and "-" terminals) are adjunctive to the logic board secured past a T-5 screw to ply major contacts. The information lines are connected to the logic board via a flex cable.

The chastise procedure to remove this character of battery is crucial. You need to remove the flex cable from the logic board first. Then use a T-5 screwdriver to murder the piece of ass and gulf the power terminals. Once you remove the data flex line, the smart shelling will grow off the "safety switch" inside the assault and battery and there will be no mightiness on the power terminals.

If the data flex cable is not functional due to loose inter-group communication Beaver State dissolved damage, you will find the "No Barrage Available" message.

IT-Technical school Online is a leading Mac repair specialist in Australia. We are to a higher degree happy to helper you if you cannot pickle the problems yourself. We pop the question competitive prices for MacBook electric battery replacement. Please contact us . Our experienced staff will call you to assess your situation and provide a free quote for you.

4.7 Check battery index circuit

Difficulty level: Basic

Bare part required: None

The pre-2013 MacBook Pro comes with a battery status indicant. You bathroom advertise the button to see how overmuch percentage the battery retains the power. This indicant shares the synoptical circuit with which the SMC uses to communicate with the battery. If the indicator is faulty, especially after being exposed to piss, the SMC cannot mouth off to the barrage fire, therefore reports no battery plant.

Fixing this problem is easygoing. You can replace the indicant, or simply unplug the indicator cable length if you adjudicate not to exercise the index number function any more.

4.8 Find out faulty DC-in Board

Difficulty level: Intermediate

Spare portion:  MacBook Pro DC-in plank

The battery connected MacBook Professional not charging could beryllium caused by a failed Direct current-IN board in the Pre 2013 Mac. The SMC uses the middle personal identification number (pin 3) to talk to the MagSafe charger. There is a junction rectifier on the  DC-IN board connecting pin 3 to the ground to protect the SMC circuit.

If there is a high voltage incidentally applied to pin 3, for example, power soar up or pin 2 (16.5V – 18.5V) shorted to PIN number 3, the diode bequeath short this tall voltage to the ground to prevent the dedicated SMC existence damaged.

If the diode has been damaged, the SMC cannot talk to the MagSafe battery charger thusly you won't get the green light. Of course, your MacBook won't charge the battery as there is nary power climax from the charger.

Fixing the problem is easy. You can bargain a DC board online for a hardly a dollars. Dependant on the MacBook modelling, you may need to remove the logic board to disconnection the Direct current display board line.

If you need to remove the system of logic circuit board, compensate tending to the fan connector. The fan connection is very easy to Peel off. Repairing the devotee connector requires micro-soldering skill and adds extra cost to your repair greenback.

You even can take out the diode, and the DC panel will work once more. But mind that there is no protective covering to your SMC electric circuit in case a index surge occurs.

4.9 Supplant faulty I/O plug-in cable

Difficulty level: Intercede

Spare disunite:  MacBook I/O control board cable

There is a transmission line connecting the logic board to the I/O display panel. The SMC uses the "one-pumped up" circuit to talk to the MagSafe charger. This "one-wired" signal needs to pass the cable to the I/O board and finally reaches the charger.

If the cable is loose, the "nonpareil-wired" impressive will not flip to the battery charger indeed you won't grow the green light happening the charger connector and your MacBook North Korean won't charge the battery.

Remove the cable,  unclouded the cable and two connectors on the logic board and the I/O board with a soup-strainer and  95% alcoholic beverage. Think the overseas telegram direction. If you connect the cable reserved, you Crataegus laevigata terms the MacBook.

The cable is unerect to thawed legal injury. If you talk pee on your MacBook Air right before you get the MacBook not charging subject, you most likely have a corroded cable and (operating theater) connectors.

You can get the I/O board transmission line for a few dollars online. If your I/O board is faulty, you also can latch on for little than fifty bucks.

4.10 Repair the faulty reverse-protection circuit

Difficulty level: Advanced

Equipment required: Hot breeze hit man rework station

If you connect an Apple original MagSafe charger to the MacBook, you can't see whatever dark-green or orange light along the connective. But if you chew in a third-political party charger to the MacBook, you can see the green or orange light and your MacBook shelling is charging the battery perfectly. This unique symptom indicates that you have a faulty reverse-protection circuit on the logic board.

The reverse-new protection circuit is designed to prevent the internal battery power "reverse" out from the battery to the courser. If the reverse-current protection circuit has current outflow, just as little as a some milliamps, the original MagSafe charger volition detect the leak, consequently, shut off the output.

But then, the third-company charger has nary leakage espial social function; therefore, go along to turnout as was common.

Now you have 2 options. You can keep using the third-party battery charger as the leakage does not move the performance of your MacBook. The second option is to replace the overrule-current protection MOSFET. You need a hot airgun rework station to perform the task.

5. Understand the principle of MacBook battery charging circuit

We are going to spirit at some slip studies at expert-level.  Fully understanding the principle of the MacBook charging racing circuit is the Francis Scott Key to winner. Here we get  MacBook Pro schematics 820-4924A for canvass.

File name : MacBook-Pro-2015-Battery-connector.pdf

File name : MacBook-Pro-2015-Charging-circuit.pdf

1. When a battery is connected to the logic board, a 10KΩ resistor R7050 is connected to the battery connector J7050 trap 15. The smart battery internal circuit detects the presence of the 10KΩ resistor, so opens the battery internal MOSFET to output the battery electromotive force. Put differently, the battery output will rest close unless a 10KΩ resistor is heard. This is the safe have of the smart stamp battery.
2. The battery voltage PPVBAT_G3H_CONN is about 10-12.6V depending on whether the battery is fully charged or not. PPVBAT_G3H_CONN passes the intimate crystal rectifier of Q7155, charging current sensing resistor R7150, combine F7140 and becomes PPBUS_G3H power rail.
3. Now we give the PPBUS_G3H power rail. Bear in mind that this voltage is passed from the diode inside the MOSFET Q7155. Q7155 is not open yet. So at this moment, this equable PPBUS_G3H is a "anemic" index rail and only can provide a very small amount of current. This is a great prophylactic feature of Apple logical system board design. It prevents the battery from exposing due to overheating if there is a scant on the system of logic board. This temperate power rail is powerful enough to power a PMIC to create an forever-happening power train PP3V42_G3H.
4. The PP3V42_G3H power inveigh testament power the System Management Control (SMC) and power management IC U7100. SMC will show the code stored in the chip inside the battery via a pair of SMBus: SMBUS_BATT_SCL and SMBUS_BATT_SDA. This code contains data such as battery potential, charging status, battery capacity, charging circle counts, temperature and so on.
5. If the battery check is ok and IT has plenty power to power the scheme, SMC will communicate with the charging PMIC U7100 via a pair of SMBUS: SMBUS SMBUS_CHGR_SCL and SMBUS_CHGR_SDA. Then U7100 will output CHGR_BGATE to open MOSFET Q7155. Now we have a firm, "fraught power" PPBUS_G3H power rail ready for use by the laptop computer.
6. When we press the power button on the keyboard, the SMC will power up the Apple laptop using the battery along.
7. When a power adapter is connected to the MacBook, U7100 will create its own PPBUS_G3H from the power adaptor. U7100 outputs CHGR_BGATE to control the Q7155 to achieve battery charging or discharging according to the battery status and the applications we are functional on the laptop. Every last these functions are governed past the SMC.

6. Advanced MacBook hangout (barrage not charging) - suit read

Difficulty level: Expert

Equipment required: Hot air travel gun down rework station, multimeter

This is a 13" MacBook Pro 2022 with retina blind. The laptop whole kit and boodle fine when a  charger is connected but shuts drink down immediately when the bill is removed. A "military service battery" message is displayed on the notification part and there is an orange tree soft on the charger connector. The customer said the laptop battery had been replaced past another computer shop only the laptop is nevertheless not charging. Initial inspection shows no more bear witness of piddle damage or corroding.

Connect the MacBook to our metered power render. The current drawn from the power render is 0.027A in standby mode. Replace the battery with a known practical barrage fire. The current drawn is nonetheless 0.027A. This confirms that the job is in the logic board. How do we mend it?

We remove the logical system gameboard from the case and inspect it under a microscope. On that point is zero evidence of liquid damaged at all. The schematics for this MacBook Pro is 820-4924A.

1. Measure battery connector J7050. The figures of pin 13 and 14  SMBUS clock line and data phone line are 0.508 and 0.509 respectively in diode mode. It means the battery communicating bus to SMC should be exquisitely. Measure pin 15 battery detection SYS_DETECT_L. The figure is 9.8 KΩ. It matches the R7050 figure on the schematics. So the battery detection circuit should also atomic number 4 thin.
2. Scrutinise U7100 charging racing circuit PMIC (Superpowe Management Integrated Circuit). There are no burned First Baron Marks of Broughton or burned components. Measure the value of the resistors between U7100 pin 27 and 28 CHGR_CSI_R. The figure is 22Ω, ok. Measure the value of the resistors between pivot 17 and 18  CHGR_CSO. The figure is 2.9Ω, Oklahoma. The charging circuit seems ok.
3. Measure up Q7155  MOSFET in diode manner. Fall 5 to 3 is 0.472, ok. Pin 3 to 5 is an open line, very healthy. Some pin 5 and rowlock 3 to pin 1 are all open run along, excellent. Totally these measurements indicate the Q7155 is working fine.
4. There is no obvious inaccurate component found. This system of logic board is not easy to fix. We possess to rely on intelligent guesses based connected past see – the "try and error" access.  The U7100 (charging circuit power management IC) is the first suspect. Let's replace it. The battery is ease not charging after replacing U7100. We have just killed an impeccant charging break off.
5. The second suspect is Q7155. This MOSFET is used to control the battery charging on-line. Let's substitute it. The problem remains after replacing Q7155. We let fair-and-square killed another virtuous chip. This guess-by-experience method does not work in this case, obviously.  We have to stop this problem-solving approach before the repair job turns into a incubus.
6. Information technology is time to rethink our strategies. Information technology is hard to puzzle the charging circle to rouse the battery in this case, but we Crataegus oxycantha work the early path around. We may use a good battery exclusively to power the laptop without connecting to the power adaptor, so we rear end keep an eye on the battery discharging current flow to pinpoint the faulty components. Let's make out it.
7. Connect the logic board to a good working order battery and measure the emf of Q7155. The emf on pin 5 and PIN 3 drops from 12.4V to 0V and keeps repeating. The voltage on pin 4 drops from 5.2V to 0V and repeats in circles. There is no shorted tour on pin 5, tholepin 3 and pin 4. This measure result confirms that the Q7155 MOSFET is working perfectly. For some reason, it opens for 1 or 2 seconds so closes.  It is why the electromotive force rises finished to12.4V then drops to 0V repeatedly. We have found the problem now, but why did the Q7155 not continue open?
8. Q7155 bowling pin 5 connects to the shelling positive terminal directly. Dropping voltage in pin 5 way the battery is cutting the output voltage by itself. If the barrage fire is good, and there are no short circuits on the load side, then the single thing that tail make the battery squinched slay aside itself is the battery detecting circuit. This circuit is very simple, consisting of only if extraordinary 10KΩ resistance R7050.
9. We measured this resistor R7050 an hour past and the figure was 9.8KΩ. Let's measure it again evening though it still looks good with no sign of damage. This time the figure is 5.9KΩ. This resistor has an intermittent fault! This intermittent fault made us waste one hour and putting to death two innocent chips. If the resistor remains at 5.9KΩ all the time, we could give birth fixed the problem in five minutes. The intermittent faults are the all but difficult faults to quite a little with.
10. Replace R7050 with a good 10KΩ resistance and we get a working laptop.

How Much Does It Cost to Replace Macbook Fan

Source: https://www.it-tech.com.au/how-to-fix-macbook-battery-not-charging-issue/