A1466 820-00165 repair attempt - Any MacBook experts here? Missing PM_SLP_S4_L

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[@eldjoesther643]

a big thank you for these beautiful videos and good practice that you teach us. 🙏

[@GurjVirdee]

Sorin I love your workshops, the way you communicate with the audience and share your skills and Tea Time. It's really nice and humble of you. Much respect to you.

[@jadaojaz8882]

8.1V on ppbus_g3h is low, it means no communication with smc Reball or replace SMC, it should be 8.6V. Before reball/replace smc, check SMC_RESET_L resistor goes often bad, check also SMC_ONOFF_L and make sure PP3V42_G3H is making its way to smc. If you want to go the systematic crazy way, you can check the 11 prerequesite for PM_SLP_S4_L to be delivered (11 signals/power rails), just google that you will find it in the wiki repair. This will give you 100% a clue and you will know what is happening :)

[@justinc9991]

Sorin, first you need to be sure there no corrosion unde smc chip. Most of the pm_slp signals come from there. Also you need to check the rtc ic, as far as i remember i saw you were cleaning that area. Corrosion there will cause the board to not start. Another thing you need to make sure, the smc is up and running (ppbus_g3h) is higher when smc is up and running.

[@inwerp]

Technically it is PCH who sets slp above s5 level. Smc only pulls them during init so they wont float high before pch power controller is initialized.

[@als1035]

Before you give up, you should should try using a genuine Apple MagSafe 2 45w power adapter. Without doing this can give you unpredictable results with PM_SLP_S4_L.

[@brightoncom]

Hi Sorin. You have to connect DCin Board with flex cable to power on.

[@f1lab535]

go through the startup sequence on the schematics and stop on the missign signal... you said that the power good signal comes on and goes off, is it reaching its destination? if its reaching its destination what is triggered after that? reball smc? check oscilator aeria with osciloscope. how much amps is the cpu consuming on your board and on the customer's board? you have a spare cpu in front of you :pppp, replace it haha or send all the parts back to your board and replace the bad smc check if its a bios issue.

[@carlosgarciaoropeza5480]

Everything seems to indicate that the voltage (8.1V) of the PPBus_G3H power rail and all its related (associated) circuitry should normally be 8.6V but I still find myself in the beginner's lessons to "decipher" the schematic diagrams about "apple stuff" that I "like" so much (personally me). All the best.

[@hirthbenedek]

The voltage on the main power rail was 8.1 volts. That means, that the smc is not running. Check voltage and short on the smc reset pin with the help of schematics. If there is no other component affecting it, it's probably the smc. You can try reflowing, reballing, maybe a bad connection. If it's still not working, you can try replacing, if it's worth it.

[@darrenstrathdee7425]

You are correct. Smc boosts it to 8.6 if my memory serves me correct

[@kpjVideo]

Agreed

[@dirzzleme01]

If I recall from Luis's videos, the main power rail on MacBook Air is about 8 volts. Maybe 8.4. Could be wrong, but it is worth checking.

[@fichambawelby2632]

@@darrenstrathdee7425 exactly

[@David5467]

Hi Sorin. Take that long jumper off. In this case you should use the board view to work out where that track goes. power on for one second and then goes off is the bios starting detecting a short and turning off,

[@radminas2739]

I had a similar problem on my IBM Thinkpad. The reason was a faulty power supply of the CPU.

[@1080pixel]

Got exactly the same model for repair here - unfortunately not the same fault: Fan's spinning, shutting down in a loop. Any suggestions?

[@samsscia]

in those 3 hours you could have repaired 4 to 5 non apple laptops. You'd be relaxed with money in the pocket and a drink in your hand. I don't repair apple, products, I like green, red , blue or brown circuit boards. I know it sounds juvenile, But apple looks like someone went crazy with black spray paint. Have a great weekend,

[@Swenser]

I have been told that black stuff is moisture attraction and corrosion growing material designed by very smart engineers. Not sure if that is true.

[@electronicsrepairschool]

Thank you!

[@labibleatarilesitedesatari6724]

Is your reset smc signal ok ?

[@margingalaxy9826]

Nice to see you with a1466

[@user-un6we3nu3q]

try to check with thermal camera maybe something shorted

[@arsayu]

You need to connect dc board with flex cable to mbr too

[@danielrock3119]

when testing again you did'nt put the flex cable from the dcin board to the logic board

[@petertiberiust3171]

10ohm CPU good ....have you ultra-soniced it yet ......green underneath SMC. I will usually remove glue around SMC and then use microscope to view underside edges

[@darrenstrathdee7425]

The issue is SMC. Check resistors around smc also and clock.

[@darrenstrathdee7425]

REMEMBER: SMC is not on if PPBUS_G3H is 8.15v instead of 8.55v(SMC needs to communicate with U7100 to tell it over SMBUS line to raise PPBUS_G3H from 8.15v to 8.55v). Magsafe LED is OFF when battery is connected and no charging, but green/orange light and normal boot from charger when battery is disconnected. Resolved by replacing Q7180 transistor.

[@radminas2739]

Why not to remove coils or current sense resistor from the circuit of CPU power supply and measure resistance on both directions (CPU and power supply)?

[@MrRvdbeek]

Before you remove those resistors what is the resistance 15 or also 10ohm? M2014 15" MBP iGPU i7-4770HQ: 10Ω, 15Ω M2014 15" MBP dGPU i7-4870HQ: 15Ω

[@ronlevin2339]

Can you inject 1V to the coil CPU and check if it is heated in one spot (dead) or the whole CPU is heated up ? Can it just be MacBook stacked in the DFU mode ?

[@bmsfx]

A1466 working second hand here is roughly 90-100£, depending on CPU, a bit more, but cant spend many minutes working on that one before it would be cheaper to buy a working second hand :P

[@SONNYemc]

Louis Rossman is your guy

[@jozsiolah1435]

I have an iphone, didn’t charge well. I fixed a power bank with a Samsung phone, to start lightning charging. Then I connected the iphone with a lightning cable to the supported power bank. After some charges, the normal cable started to fix the battery, supporting 5.1 v, and 4.9 v charging at 1 A. Could be the same with Apple laptops. The best could be to first charge up the battery separately, after it’s done, in most cases charging will start. If the customer is on blacklist, his devices will be stopped with a satellite, even the charging.

[@uricohen5463]

hello sir how do you record all your camera and microscope also , do you use a device to connect all the cams , what cams you use

[@kaspark8826]

Hello Sorin, Did you sorted out the issue? Having exactly the same problem.

[@jesuschal3802]

You need a micro polishing pen to scratch those small surfaces

[@johnathanasiou9284]

Somethings up with the SMC & I wouldn't be surprised if there's corrosion under it. Check out Piernov's amazing Mac repair notes under Repair Wiki, LogiWiki & Badcaps for awesome tips

[@SinsBird]

Have you checked U1930?

[@fichambawelby2632]

Agreed with Justin C, Sorin. Ten ohms per CPU rail is normal, not shorted. But in this Macs, PPBUS_G3H is very important. So, as he said, prepare yourself for an SMC removal and reballing (maybe you are having corrosion there, below the SMC). By the other side, if you need to check if you have any light in the charger, the flat cable must be connected between power board and main board (essential if you need to have green/orange light). And BTW check if you have clock signal in clock IC and its termination resistors. Also try to use (if you are able to) another power board, with an original Apple charger. Let us know.

[@DanielsGameVault]

You should do a collab with Louis Rossmann :D

[@GurjVirdee]

Louis is good, but he's very egotistical.

[@DanielsGameVault]

Sadly so, especially now that his business is fully grown. I used to like his humble beginnings better...

[@daffyduk77]

@@GurjVirdee When you're that good, very difficult not to be. Sometimes there seems such a huge gulf between him & the regular repair guys

[@GurjVirdee]

@@daffyduk77 maybe so. But no need for anyone to be like that. I class them as pricks, regardless of skill or education. There's always someone better out there.

[@daffyduk77]

@@GurjVirdee I hear what you say. Someone like Rossmann is going to encounter people who are better than him at the tech/repair side only *very* rarely. In the words of one of my fave rock lyricists , "the wise men don't know how it feels ... to be thick as a brick"

[@electronicsolution2384]

I guess if I post a link it will delete it? well, I tried to post about the PM_SLP_S4_L signal which must be present But first, you should reball that SMC, any corrosion or spec of dust from the existing problem could cause it to stop working

[@MohammedWahab-he1mt]

Can anyone tell me how long it takes to become a technician?

[@jimmysmantzas]

probably needs smc replacement, they die easily on these boards with a little liquid all the time

[@laptopDoctorKZN]

Hi sorin. I had same problem. It was a shorted cap by the usb port.

[@GurjVirdee]

Common board for SMC failure

[@nadegebaka883]

Hello SORIN It is hard to see your Power supply ''voltage ''display. I mentioned it MANY TIME bcs it is Hard to follow when you repair.. Your could CHECK your video online to see what I'm talking about. Thank to you to ''solve it ''. T

[@chrisdevitto4340]

I’d check with Paul Daniels look through his videos I’ll bet you find your answer.

[@ElectronPCFix]

Finally It's Friday! Hahaha...

[@ch2o2]

am I totally wrong when I think, that the cables you use to bypass broken tracks are not insulated (no lacquer coating, whatever). If so, don't you worry that such bare cables could produce silly, random short circuits? I'm sure, you take care about such cases (and you isolate everything afterwards) ..it's just for understanding

[@ElectronPCFix]

Waiting for coffee and electronics please when is it going to start?

[@jaym5938]

Perhaps ask Chris at Rossmann repair?

[@doctorlaptopuk]

And THIS is why we stopped doing Macbooks last year. You can spend a day on one and still not get it fixed. I suspect you need to do an SMC reball here. Not such a bad job but use 0.3 balls. Then, when that fails get a large hammer and a pound for the swear box.

[@ruudvansteenis]

Calling Doctor Rossmann, urgent please!

[@optimizelogicrepair2784]

Re-Ball/Replace SMC. Anytime I get one of these boards with liquid damage next to SMC, it is automatic. Another clue, is no green light. I bet PPBUS_G3H is 8.14V. Should be 8.56V. Not sure if these may help. kzbin.info/aero/PLHgLf-SjjTdwX2fp_YQS06hfwja5xgqDN

[@electronicsrepairschool]

Thank you. Of course is 8.56, i said every power rail is fine, i have green light and orange light on the charger, is charging the battery fine, and the board is coming on without DDRREG_EN which enable 1.2v power supply which is also fine

[@optimizelogicrepair2784]

Did you get it working?

[@HalifaxComputersRepair]

so your not working at the computer store any more?

[@moskito2010]

Reflow SMC Chip

[@teslasapple]

Clear PRAM NVRAM SMC 🤷🏼‍♂️

[@andreasmoll_0924]

A little bit of raisin.Just a little bit small raisin between this two pins

[@miguemawe]

cpu shorted!

[@humamalrawi1276]

3.4 take it form power supply not from chip

[@prosolder]

you have more bad joints and i think you didnt find all the bad traces from liquid damage and you probably have to find all the missing traces thats your problem[you have to spend more hours to look at them and to find them]

[@nelsoningalsbe8262]

Its a apple just trash it in the bin😅

[@billyjames9861]

The last wire you soldered was touching another circuit/trace - The first wire you soldered may also be touching another capacitor

[@Radek__]

I think that wire has a shield/paint cover like a wire inside transformer or coil.

[@MrPnew1]

@@Radek__ yes, magnet wire

[@weerobot]

It's Apple..

[@repaircorner3322]

To compare the boards, first please remove the M2.sata ssd drive. It can be faulty.

[@cazi7244]

Hello Sorin, in my opinion you cut out to much content. It was not easy to follow your proceed.

[@croatiafishingtour]

Stop repairing Apple laptops.

[@SinsBird]

Too much editing in the video, hard to follow.

[@martykopka]

You need a grinding pen. Would save you effort when trying to 'dig' and find traces. Can even buy one from 'Northridge Fix' :-)

[@lenhunter2719]

I love Alex's work and would love to be able to buy some decent quality tools and equipment from his company. Sorin is also a great technician but, even more than that, he is an awesome, caring and patient teacher.

[@electronicrepairservice2020]

Feel your frustration, have been there after hours/days, perplexed & disgusted. This is a learning experience so it requires an investment of time.🤓 Louis is the known expert on these, maybe you could try to reach out to him for an explanation? Could be a better option than making yourself crazy 🤔 Hope you can get it sorted out.

[@Muhendisbeyy]

a big thank you for these beautiful videos and good practice that you teach us. 🙏