Hello there, do you know where can i order U6990 and R5001 from? I have both missing from a board i picked up dead for 5 bucks and they are not easy to find in south america… Thanks for the tutorial and info shared
You're very talented. But I think the right approach to board repair is repair by a factory type facility where they have all the secrets to how the board is constructed and even some machinery for SMD work. Even pros like you have to do guesswork and essentially reverse engineer. One time I needed to fix a PSU from an industrial scanner. I contacted the PSU's OEM and they charged me $40 to repair it. Obviously a power supply is pretty primitive, but the OEM could repair it the best way, because they made it and know it from top to bottom. Board repair is basically a cat and mouse game.
Hi Louis, That's a great video, it's a pity that audio is not syncro with video anyway I really enjoyed and learned some useful things from this video. would be great if you show also how to remove this chip ISL6259 live. Keep posting videos like this one, I'm a beginner and I'm waiting now your videos related to the tools you suggest to buy that allow people like me start repairing MB's without spending huge money. Big thank you from Switzerland.
i bit the bullet and bought a six core desktop to do this, fuck doing live videos with micro & camcorder live recording ot the laptop. I can fuck up audio sync by simply scrolling through the pdf and spiking CPU usage on the laptop. I should be able to do much more of these soon
Hi Louis, you actually explained in detail what happen if you don't have SMC_BC_ACOK coming into U6901 but can you also explain in detail what to check if I'm not getting the 3.42v coming into U6901 ? When I start measuring around I had this 3.42v coming into U6901 however after some troubleshooting I don't have it anymore.. so now I don't have both :(..
Greetings Louis from the uk, Thank you for posting your thoughts and processes, it seems you like to solve things as do I and not having a degree in a subject just makes finding out more fun. Plus you make money from thinking logically and what could be better. Also what is the software you use to locate the components? be good ricci
Hey Louis, great vid. I'll see if it can help me fix my trashed macbook. By the way I think that ACOK is meant to be read AC OK, as in the AC is Okay! Just a guess :P
Louis, I have this logic board, 820-2915-b, the fan are spinning all the time, the kernel task is higher on the activity monitor, all the system is slow. Should I replace the 330mF capacitor ?
Okay. Thanks bud! I'll use a multimeter. Could you please tell me the location of the SMC_BC_ACOK on this board please, so I can check the 3 Volts flow?
Louis, do you have any tips on the replacement process for the isl chip? I've got a 2915 board that's got a short to ground on the ACIN pin of the isl. I've read replacing it can be tricky. Is it as "simple" as the process you used in the WLED driver replacement video?
To answer my own question here for anyone who might be wondering: Replacing it with a reflow/heat gun was easier than expected. The main thing I figured out was to expose enough of the surrounding board that the entire area gets warmed up, not *just* the chip. Otherwise it won't ever come off. Once it's off, getting rid of the lead-free solder and putting leaded solder made getting it back in place really easy once it's lined up. It just sinks into place with a lot less heat/time.
Thank you for the videos. I have a macbook pro 13" 2010 battery is not being recognised by the system and "X" icon shows on the battery, any ideas where I should be looking? Thanks
I don't have green light at all when I plug in the power adapter after taking the logic board out. It was water spill. I am suspecting it's shortening to ground. I just got an oscilloscope. How do I generate power to the board to test volt readings at various points?
Back up back up. First off, what board? 820 number. Secondly, do you have SMC_BC_ACOK at 3 volts? If so, do you have SYS_ONEWIRE?
10 ปีที่แล้ว +1
Measure your resistance from power rail coils to ground, see if this helps you indetify the shortened rail. If you find it measure main buck controller components. Replace failed components ;)
I don't see a 820 number on the board. It seems like a late 2012 or early 2013 15" MacBook Pro retina display. Can I look for the 820 # somewhere on the board?
So, I have green light, orange light too, battery charge LEDs works ok, but my Macbook Pro won't turn on, already tried smc reset and all key combinations possible, even shorting rs501 pads and nothing happened. So my question is: Did this kind of symptoms happened to one of your repairs before? Is it possibe for a faulty logic board to keep on charging battery? All this started to happen after my magsafe cable got shorted out. I repaired and tested the charger and it's Ok and even tried with other charger. Any suggestions? Please!
Hi, your Videos are great :) Thanks. I'm from Luxembourg, my english isn't very good :) I have a Problem with my macbook, that means no start no battery charging, and the Led in the charger plug flashes orange and very weak. Did you even have had such a Problem? Tanks :)
Louis Rossmann I have a similar question. I have no green light and no fan spinning. There is a short on L6995 and everything that is connected to the =PP3V42_G3H_REG. Could it be the U6990? (820-3209)
Louis, I work in the IT industry and with computers similar to you and I get it what you mean by answering phone calls and people interrupting during business hours or calling your extension directly. I know what you mean and I'm the exact same way.. Anyways, I have a few questions on Logic Board on Bad ISL6259 and PPP-G3Hot and I am not sure if you want me to ask them right here or if you prefer a more one on one email. Either way, if you feel more comfortable with emails, may I have your email address please? BTW, I like your practical approach to all the troubleshooting videos that other people don't want to touch...Hats off! Keep up the good work!
***** SMC_BC_ACOK... System Main Controller_ Battery Charger_ AC (Alternating Current) OK (okay) ... my guess is this is telling the SMC the charger AC supply is ok... strange since it's a 16 or 18v DC (direct current) output from the mag-safe that its looking at, but if the charger was outputting 24v DC it wouldn't be ok, to turn on or charge the battery... it would be interesting to test the upper and lower limits of turning on/off and allowing battery charging... would it turn on at 14v but not charge? or vica verca? perhaps an idea for a video using your power supply...
Hi Louis... I am really awed by your expertise... Extremely good videos.. By the way I have a logic board 820-2337-A can you help me with schematics since the unit power LED lights up but no display would be grateful to your help...!
Louis You are the ROCK STAR of Component board repair!
+Larry Lees Thank you!
Hello there, do you know where can i order U6990 and R5001 from? I have both missing from a board i picked up dead for 5 bucks and they are not easy to find in south america… Thanks for the tutorial and info shared
Great video, very informative, down to earth language - keep up the good work mr. Rossman!
You're very talented. But I think the right approach to board repair is repair by a factory type facility where they have all the secrets to how the board is constructed and even some machinery for SMD work. Even pros like you have to do guesswork and essentially reverse engineer.
One time I needed to fix a PSU from an industrial scanner. I contacted the PSU's OEM and they charged me $40 to repair it. Obviously a power supply is pretty primitive, but the OEM could repair it the best way, because they made it and know it from top to bottom.
Board repair is basically a cat and mouse game.
Thank Q Louis for all the motivational videos...
Namaste.
Hi Louis, That's a great video, it's a pity that audio is not syncro with video anyway I really enjoyed and learned some useful things from this video. would be great if you show also how to remove this chip ISL6259 live.
Keep posting videos like this one, I'm a beginner and I'm waiting now your videos related to the tools you suggest to buy that allow people like me start repairing MB's without spending huge money.
Big thank you from Switzerland.
i bit the bullet and bought a six core desktop to do this, fuck doing live videos with micro & camcorder live recording ot the laptop. I can fuck up audio sync by simply scrolling through the pdf and spiking CPU usage on the laptop. I should be able to do much more of these soon
Hi Louis, you actually explained in detail what happen if you don't have SMC_BC_ACOK coming into U6901 but can you also explain in detail what to check if I'm not getting the 3.42v coming into U6901 ? When I start measuring around I had this 3.42v coming into U6901 however after some troubleshooting I don't have it anymore.. so now I don't have both :(..
I mean if you don't have PP3V42_G3H coming into U6901. sorry :)
Louis Rossmann, here can we get those schematics and board views you were using?
Greetings Louis from the uk, Thank you for posting your thoughts and processes, it seems you like to solve things as do I and not having a degree in a subject just makes finding out more fun. Plus you make money from thinking logically and what could be better. Also what is the software you use to locate the components?
be good
ricci
thanks
hay luis..i have 820-2915A,,short on PP1v8_S0..and can i do this?
16:25 ACOK means (AC OK) AC adaptor OK, working) :D
Yeah, I figured that was kinda self-evident ;)
Hey Louis, great vid. I'll see if it can help me fix my trashed macbook. By the way I think that ACOK is meant to be read AC OK, as in the AC is Okay! Just a guess :P
pleas i want diagram for macbook pro A1281 thank you very much
Louis, I have this logic board, 820-2915-b, the fan are spinning all the time, the kernel task is higher on the activity monitor, all the system is slow. Should I replace the 330mF capacitor ?
yes
Got it. Thanks! It is 820-3332-A
Okay. Thanks bud! I'll use a multimeter. Could you please tell me the location of the SMC_BC_ACOK on this board please, so I can check the 3 Volts flow?
i am having 820-2936 logic board having problem like turns on with high fan speed with no display , is there any suggestion, bios reprogram can help.
what app are you using to identify the components on the board
Louis, do you have any tips on the replacement process for the isl chip? I've got a 2915 board that's got a short to ground on the ACIN pin of the isl. I've read replacing it can be tricky. Is it as "simple" as the process you used in the WLED driver replacement video?
To answer my own question here for anyone who might be wondering: Replacing it with a reflow/heat gun was easier than expected. The main thing I figured out was to expose enough of the surrounding board that the entire area gets warmed up, not *just* the chip. Otherwise it won't ever come off. Once it's off, getting rid of the lead-free solder and putting leaded solder made getting it back in place really easy once it's lined up. It just sinks into place with a lot less heat/time.
Thank you for the videos. I have a macbook pro 13" 2010 battery is not being recognised by the system and "X" icon shows on the battery, any ideas where I should be looking?
Thanks
You definitely have to replace your battery. Or it could be an issue somewhere else
I don't have green light at all when I plug in the power adapter after taking the logic board out. It was water spill. I am suspecting it's shortening to ground. I just got an oscilloscope. How do I generate power to the board to test volt readings at various points?
Back up back up.
First off, what board? 820 number.
Secondly, do you have SMC_BC_ACOK at 3 volts?
If so, do you have SYS_ONEWIRE?
Measure your resistance from power rail coils to ground, see if this helps you indetify the shortened rail. If you find it measure main buck controller components. Replace failed components ;)
How do I measure SMC_BC_ACOK at 3 volts? What all do I need to check this? Do I need some kind of power supply that's supplying 3 volts?
Use a multimeter.
I don't see a 820 number on the board. It seems like a late 2012 or early 2013 15" MacBook Pro retina display. Can I look for the 820 # somewhere on the board?
yes
4:20
What's the name of this software ( dark window) ?
I want to know it !!!
Can anybody please help me ?
That is the software Louis used before "OpenBoardView" was released. I highly recommend OpenBoardView for displaying board views.
I think if you read it AC-OK instead of A-COK then you probably understand what it means :)
So, I have green light, orange light too, battery charge LEDs works ok, but my Macbook Pro won't turn on, already tried smc reset and all key combinations possible, even shorting rs501 pads and nothing happened. So my question is: Did this kind of symptoms happened to one of your repairs before? Is it possibe for a faulty logic board to keep on charging battery? All this started to happen after my magsafe cable got shorted out. I repaired and tested the charger and it's Ok and even tried with other charger. Any suggestions? Please!
TheMetalMusicMachine Which power rail is missing?
hello I know where to get the software to the location of the components on the printed circuit?
a colleague from Italy
Hi, your Videos are great :) Thanks. I'm from Luxembourg, my english isn't very good :) I have a Problem with my macbook, that means no start no battery charging, and the Led in the charger plug flashes orange and very weak. Did you even have had such a Problem? Tanks :)
+Andy Lauer Also I wanna know what Software you use to locate the parts on the board. In the schematics there are no board layout Pictures :(
is the chip u6990 is bad can do the same thing? i mean no light in the magsafe connector
Do you have PP3V42_G3H?
Louis Rossmann I have a similar question. I have no green light and no fan spinning. There is a short on L6995 and everything that is connected to the =PP3V42_G3H_REG. Could it be the U6990? (820-3209)
Inject 3v and find the short.
Louis, I work in the IT industry and with computers similar to you and I get it what you mean by answering phone calls and people interrupting during business hours or calling your extension directly. I know what you mean and I'm the exact same way.. Anyways, I have a few questions on Logic Board on Bad ISL6259 and PPP-G3Hot and I am not sure if you want me to ask them right here or if you prefer a more one on one email. Either way, if you feel more comfortable with emails, may I have your email address please? BTW, I like your practical approach to all the troubleshooting videos that other people don't want to touch...Hats off! Keep up the good work!
Is it shorting to ground, what voltage is it?
***** SMC_BC_ACOK... System Main Controller_ Battery Charger_ AC (Alternating Current) OK (okay) ... my guess is this is telling the SMC the charger AC supply is ok... strange since it's a 16 or 18v DC (direct current) output from the mag-safe that its looking at, but if the charger was outputting 24v DC it wouldn't be ok, to turn on or charge the battery... it would be interesting to test the upper and lower limits of turning on/off and allowing battery charging... would it turn on at 14v but not charge? or vica verca? perhaps an idea for a video using your power supply...
HAHA "A COK"...
Hi Louis... I am really awed by your expertise... Extremely good videos.. By the way I have a logic board 820-2337-A can you help me with schematics since the unit power LED lights up but no display would be grateful to your help...!
Darko,
Do you have an email address I can reach out to? Thanks in advance.
ca va
what value shuld smc_bc_acok have ? i mean how many volts it should be ?
+bed boy xxx 3-3.3v