MacBook Air A2681 battery problem after Screen Replacement

[mon2]

Also confirm if the lid sensor is working. Try to close the display assembly 90% of the way and the display should turn off and vice versa during opening.

[mferna14]

Also confirm if the lid sensor is working. Try to close the display assembly 90% of the way and the display should turn off and vice versa during opening.

There is NO ISSUE with the lid sensor. On a good Working laptop A2681 ., I remove the LID sensor all together. The ONLY difference was that the screen was not turning off & that's it. The lid sensor does not effect the charging or working of the battery.

[mferna14]

Good morning friends
I have the same problem with an A2681, I replaced the screen and with the cable it works perfectly but it does not charge the battery, it indicates 1% the battery is not charging

Could you solve it?

Kindly send us the photo of the error. If you are on the desktop., that photo would be great to build up a case. & please check whether your camera works or not?? Thanks

[mferna14]

Good afternoon Mferna14, I also tried to reinstall the original screen without success, the battery did not charge either.
I have been carrying out tests and if I enter system information, with the battery connected I get the battery serial number, the health (100%) and all the battery information, if I access information without having the battery connected, no It gives me no information, with which I understand that the battery is being detected and it must be some software problem, but I have not been able to find the solution.

I wanted to try with another battery, but I don't have another one, maybe I'll buy it to carry out the test and I'll tell you.

I will also check under the screen hinges in case there are any flexes (in addition to the aperture sensor flex) to see if those hinges on the new screen have damaged anything, although I seem to remember that there was nothing.

You have done a good job. I had an EXTENSION cable which I attached to the Original Broken one. I did not even need to install the LCD Screen. Used a Powerful LED torch behind, & the screen was as clear as a new (BUT BROKEN), But since the so called New Replacement LCD destroyed the SMBUS, so the original LCD even displayed the same error, battery on 1% & not charging. I suggest all NOT to Purchase Yet, till they confirm they have found a solution from us. Kindly inform me from where did you purchase the LCD screen??? Thanks

[mon2]

See attached. This may be the root cause. Notes are from the A2681 schematics.

[mferna14]

mon2., I had read this before & was finding this metal gasket. I never came across any extra or other kind of metal other than Apple has installed during installation & trust me all the metal gasket were intact & one can never even notice that the LCD was ever replaced by us, as every screw & the metal gasket are in it's place. We are left with the 0 Ohms resistor (whether OPEN ??? due to a surge), Now its up to @Libera y repara to check this resistor as I do not have any laptop with me, I gave them all back in the same "battery not charging" condition.

[mferna14]

@Libera y repara., all in your hands buddy to find this metal gasket & see if this can resolve the problem. I could not find any other metal pieces other than the one below which is a flex cable rounded plastic one with 2 screws & the other one is screwed on top of it. Maybe our solution lies out here ONLY. Kindly check please & send your feedback

[Libera y repara]

Buenos dias, a mi si me aparecen los ciclos de carga,el numero de serie de la bateria,la salud indica 100% y todo correcto,lo unico malo es que no carga la bateria,tiene un 1% de carga e indica " no se esta cargando" ,ahora revisare las lineas Bvus,pero si tengo toda la informacion de la bateria en pantalla entiendo que las lineas estan correctas
Yo compre la pantalla en AEel vendedor es XJS ,pero no responde,estoy a la espera de la respuesta a ver si podemos dar solucion
Hoy encargare otra bateria y realizare pruebas

[mon2]

Translation…

Good morning, to me if I appear the charge cycles, the serial number of the battery, health indicates 100% and all correct, the only bad thing is that it does not charge the battery, has a 1% charge and indicates "is not charging", now I will check the lines Bvus, but if I have all the information from the battery on screen I understand that the lines are correct
I buy the screen in AEThe seller is XJS, but not responding, I am waiting for the answer to see if we can give solution
today I will order another bat

[mon2]

No. Do not order another battery. See my earlier post #25.

Both Seven Puppy and Master Liu (Shenzhen) are monitoring this thread. Master Liu just texted back.

His comments..

Yes, this signal problem will cause the battery to not work. But I didn't encounter the problem of not charging after replacing the LCD.

With this feedback, please solder short the smd 0201 resistor pads (R15B1) I mentioned in post #25. Do update this thread with your progress. We will order the same lcd from Seven Puppy to service the same laptop. Do not suspect the fault is with the lcd assemblies (regardless of brands).

[mon2]

I am not yet at the office but would like for you to test another suggestion...

Locate the metal plate that covers the battery BMU connector. There are 2 screws mounting this plate. Remove this plate. Then using a plastic spudger lift the black tape that holds the BMU flex cable on the logic board. We are not wanting to disconnect the connector but only elevate the black lift tape. Suspecting that this tape is conductive. That is, this black tape needs to touch the metal plate we just removed to close this BMU detect circuit. If the tape does not touch the metal plate, the charging will disable. Confirm this theory. From post # 25, suspecting this is the circuit and the bottom part of the metal plate is the cowling.

[ugamazing]

I want to provide some additional information about Seven Puppy LCDs to anyone who sees this thread:

We have a half-dozen retail customers who have 'found' this Seven Puppy vendor for LCDs, and ALL of the customers have experienced cases of the LCDs KILLING their logic boards, over the past 2 years or so. In every case, the affected unit was a 2020 M1 unit (a few were A2337, a few were A2338). The LCDs all killed the CPUs, without any doubt. In a few cases, the LCDs (I suspect a possible improperly-refurbished assembly) are pulling way too much current and burning the first pin on the LCD connector/cable--LPDP_INT_AUC_C_N. This is the most-recent failure we've noted (twice in the last few months), and I do not know if it's the exact-same-failure in every case. Because if we EVER see a "Seven Puppy" LCD installed, we do not provide a warranty on the board/repair/CPU/etc. If it's an issue relating to sleep or crashing of the CPU, we don't even waste the time diagnosing it--we just immediately suspect the LCD, and we DO NOT connect our own working LCDs to an affected/damaged board.

Seven Puppy LCDs are TRASH--they are the cheapest part in the business for a reason (and that's why so many have flocked to them for the past few years--to save money). They are either improperly refurbishing the LCDs (1v8 vs. 3v3 issues come to mind), or they are selling damaged parts that have seen liquid or something. The first sign of failure we've noticed--at least with the A2338 and A2337 units--is that the LCDs often KILL SLEEP FUNCTIONS. The units developed an issue where they wouldn't sleep with ANY LCDs after the Seven Puppy LCD was installed and damaged the CPU. In one case, it kept killing the mPMU; we replaced the mPMU and it killed it again and again, until it eventually killed the sPMU as well, and damaged the CPU.

I contacted Seven Puppy myself with the findings (this was 18 months ago), and got no response to two separate emails. I asked them to please provide details on the refurbishment process and to confirm they weren't somehow mixing or crossing the components for the 2020 Intel displays into the 2020 M1 displays. Of course, now you guys are reporting issues with the 2022 LCDs now, so who knows what issues these guys have going on at this point?! Really poor quality control of such expensive parts.

AVOID ALL SEVEN PUPPY LCDS IF YOU CAN. Don't skimp and save $30-50.00, because you may very well be inviting tons of trouble and headache (and ultimately WAY MORE COST) into the mix.

[mon2]

Interesting. Which brand of LCDs are you using that are better? We have used Seven Puppy at least 2 times and found the display assemblies to be excellent. Better than XJS whom we used to use. Had an issue with power cycling with a XJS display assembly this past summer. The display connector was fine but every time we would mate the SMBUS related connector, power cycling would occur. Their Shenzhen store suggested to return the display assembly back at our own expense. Demanded we keep the shipping at the lowest so they can reimburse the shipping fee. Used the cheapest method to ship at $30 back to them without tracking. Months later, they acknowledged the assembly was received and can replace it. We declined because our Seven Puppy unit worked in seconds and the customer was long gone. Now they have issued a refund which we have yet to receive for a few dollars short of the price on Aliexpress. No compensation for the months of waiting; no compensation for their poor QC which we read on other forums has to do with the T-con board programming fault; and not for the full purchase price and certainly nothing for shipping the factory defective LCD assembly back to their side. Never again for us with XJS whom we had used for years.

Not yet convinced there is a fault with either vendor for this case. The schematics clearly indicate the logic of the metal cowling that must be shorted to allow for the proper operation of the BMU.

Either this cowling needs to be mated properly OR the referenced (post #25) resistor pads needs to be shorted to bypass the same. Waiting on feedback of these suggestions. We will do the same review once the replacement LCD display assembly arrives.

[mferna14]

Interesting. Which brand of LCDs are you using that are better? We have used Seven Puppy at least 2 times and found the display assemblies to be excellent. Better than XJS whom we used to use. Had an issue with power cycling with a XJS display assembly this past summer. The display connector was fine but every time we would mate the SMBUS related connector, power cycling would occur. Their Shenzhen store suggested to return the display assembly back at our own expense. Demanded we keep the shipping at the lowest so they can reimburse the shipping fee. Used the cheapest method to ship at $30 back to them without tracking. Months later, they acknowledged the assembly was received and can replace it. We declined because our Seven Puppy unit worked in seconds and the customer was long gone. Now they have issued a refund which we have yet to receive for a few dollars short of the price on Aliexpress. No compensation for the months of waiting; no compensation for their poor QC which we read on other forums has to do with the T-con board programming fault; and not for the full purchase price and certainly nothing for shipping the factory defective LCD assembly back to their side. Never again for us with XJS whom we had used for years.

Not yet convinced there is a fault with either vendor for this case. The schematics clearly indicate the logic of the metal cowling that must be shorted to allow for the proper operation of the BMU.

Either this cowling needs to be mated properly OR the referenced (post #25) resistor pads needs to be shorted to bypass the same. Waiting on feedback of these suggestions. We will do the same review once the replacement LCD display assembly arrives.

mon2., thanks for all your feedback. XJS contact is John & I did ask him for this issue & he just told me, did not hear of it with their LCDs. I contact him on WhatsApp. Regarding BMU metal piece. I did everything within my knowledge, but could not get the battery working. Since you have a physical A2681 laptop with you, you can check it with the broken screen & remove the metal piece all together & check out the progress of the battery, you will know the working principle of this metal piece. You do not have to see the display or whatever. I checked with a known good A2681 laptop. As soon as you open the LID the laptop should chime & start to boot without any external power attached. DO NOT SCREW THE METAL PIECE during this test/experiment. If the laptop DOES NOT CHIME, then you shall know the importance of this metal piece that the battery is not conntact., & then put this metal piece back again & check the result. I do not have a physical A2681 with me or I would have done this test myself. Try to check & inform us please before you replace the physical LCD Screen from Chinese sellers. Thanks dear.

[mon2]

Ok, will test the above in the morning at the office.

Ignore my suggestion in post #31. Do not yet understand how this metal piece enables the bmu other than forcing a better friction fit of the bmu connector. There is a depression which a bottom gasket on this metal plate. In the end, the missing resistor will bypass this entire detection process.

I understand your concern. Does this bmu logic disable the use of the battery completely or only the charging of the battery?

Will study more tomorrow. We need to report our position with the client and may request they take the unit to Apple. Master Liu has not faced this issue but uses other brands.

[Libera y repara]

Buenos dias,la mia es XJS,estoy hablando con ellos por AE y me indican que no tiene relacion la pantalla con la falla de bateria y que no tienen conocimiento de mas gente con este problema ,si ustedes han contactado con ellos creo que nos estan mintiendo los de XJS,porque somos varios los que estamos contactando con ellos y nos indican que no saben nada,esto empieza a oler mal

Translation:
Good morning, mine is an XJS, I'm talking to them via AE and they tell me that the screen has no relation to the battery failure and that they don't know of any other people with this problem. If you have contacted them, I think that the people at XJS are lying to us, because there are several of us who are contacting them and they tell us that they don't know anything. This is starting to smell bad.

[Libera y repara]

Estoy realizando prueb...........................

Please read the PM i sent you, post in ENGLISH Please !!!!!!!!!!!!!

[SMDFlea]

Estoy realizando prueb...........................

Please read the PM i sent you, post in ENGLISH Please !!!!!!!!!!!!!

Please read the PM i sent you, post in ENGLISH Please !!!!!!!!!!!!!

[PITERPENY]

all M series macbooks will not accept charge until the system is reinstalled after an emergency with a macbook or replacement of parts! my A2861 started charging only after restoring the DFU system and entering the installed system you will receive the sound of connecting the battery! most likely the system needs to re-initialize all new and reconnected devices (something like on iPhones)!

[mon2]

Test the shorting of this resistor.