With a dead USB controller your mac would start up as normal (I had it once on a Macbook unibody A1278). It could be a bad RAM memory chip but they are soldered to the board by the MBA...
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SMC Issue on MBP 13 - Hardware Troubleshooting Guide
- Thread starter Dadioh
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With a dead USB controller your mac would start up as normal (I had it once on a Macbook unibody A1278). It could be a bad RAM memory chip but they are soldered to the board by the MBA...
macbook pro 2010 15" 820-2850-A
Thanks to "dieett" for the boardview, worked great.
But I struggle a little with this board, machine runs but with fan on 100%.
Gets error (4SNS/1/C0000008: TCOD--124)
opend the machine and see 3 ic`s that were corroded, see picture.
There is also many shorts on the caps connected to:
PP1V5_S3RS0
PP1V05_S0
PPVCORE_S0_GFX
Anyone that have had this problem before or could give a hint were to start looking, I have removed the 3 ic`s that were corroded by the way.
Thanks
Thanks to "dieett" for the boardview, worked great.
But I struggle a little with this board, machine runs but with fan on 100%.
Gets error (4SNS/1/C0000008: TCOD--124)
opend the machine and see 3 ic`s that were corroded, see picture.
There is also many shorts on the caps connected to:
PP1V5_S3RS0
PP1V05_S0
PPVCORE_S0_GFX
Anyone that have had this problem before or could give a hint were to start looking, I have removed the 3 ic`s that were corroded by the way.
Thanks
Attachments
My macbook pro a1278
Hi. i posted earlier with an issue with my macbook. Im new to logic board repair but aim to become a veteran and regular poster here, obviously itll take a few years of experience.
i had a few misshaps as my multimeter needs were not thin enough and there was a lot of slippages. I managed to kill the charge indicator LED by shorting the magsafe
i managed to kill my u7200 witch i belive already had a fault by slipping and shorting a 5v and 12v capacitor (this also sent the usb controller up in smoke)
so now i have a whole load of things on order from digikey and aliexpress. its going to take them a while to get here. I do believe i have found an issue i probably caused myself withing the charging circuit.
the fet Q7080 is shorted on my logic board so i will put in another order, i believe this to be the cause of the charger not communicating with the smc as well as the laptop killing dc jack boards when it has both the battery and the charger input.
Then i believe the fault lies within one of the many ic's ive ordered. as said this is all very new to me and i MAY one day get this logic board working but this is more for training purposes and experience.
i will keep you guys update with it if anything happens, but i just want to thank you guys once again the help and support you guys are giving each other is brilliant!
Hi. i posted earlier with an issue with my macbook. Im new to logic board repair but aim to become a veteran and regular poster here, obviously itll take a few years of experience.
i had a few misshaps as my multimeter needs were not thin enough and there was a lot of slippages. I managed to kill the charge indicator LED by shorting the magsafe
i managed to kill my u7200 witch i belive already had a fault by slipping and shorting a 5v and 12v capacitor (this also sent the usb controller up in smoke)
so now i have a whole load of things on order from digikey and aliexpress. its going to take them a while to get here. I do believe i have found an issue i probably caused myself withing the charging circuit.
the fet Q7080 is shorted on my logic board so i will put in another order, i believe this to be the cause of the charger not communicating with the smc as well as the laptop killing dc jack boards when it has both the battery and the charger input.
Then i believe the fault lies within one of the many ic's ive ordered. as said this is all very new to me and i MAY one day get this logic board working but this is more for training purposes and experience.
i will keep you guys update with it if anything happens, but i just want to thank you guys once again the help and support you guys are giving each other is brilliant!
Attachments
that is indeed my next piece of equipment i need to focus on.
Just started with most of this. brought a preheater, new iron, flux'es pastes, solders, wick's allsorts of bits and bobs
Still down hot tweezers for my iron witch i should go order, need to go buy some needles, plan on taking a magnet to the hobby store just to make sure they conduct electric and soldering the needles to a set of prongs that were damaged.
all i need now is a desk so when im working on laptops i dont have to sit on the floor
Macbook pro 13" 2.4 mid 2010
I am working on a water damaged Macbook pro 13" 2.4g mid 2010.
Cleaned the board up, It had minimal corrosion, Thought it might only need a quick cleaning.
Magsafe is dim green.
Doesn't charge.
I am able to turn it on with the pads and the keyboard.
When it is turned on and connected to both magsafe and battery, the fan does not turn on. The Hard drive spins up and continues to run until board is turned off.
When it is turned on with just battery, hard drive spins up then stops after a few second. no fan, no display.
When power is pressed with magsafe it will not turn on.
Board does not beep, or chime when started.
Display is not lighting up or has no image. External doesnt show anything
The processor gets a little warm, but it should be very warm.
I have checked some voltages. I have also read through the thread but I need some direction.
Took another look, seems the Q5660 right under the fan connector has a bad solder joint.
Still tracking down no display/backlight
I am working on a water damaged Macbook pro 13" 2.4g mid 2010.
Cleaned the board up, It had minimal corrosion, Thought it might only need a quick cleaning.
Magsafe is dim green.
Doesn't charge.
I am able to turn it on with the pads and the keyboard.
When it is turned on and connected to both magsafe and battery, the fan does not turn on. The Hard drive spins up and continues to run until board is turned off.
When it is turned on with just battery, hard drive spins up then stops after a few second. no fan, no display.
When power is pressed with magsafe it will not turn on.
Board does not beep, or chime when started.
Display is not lighting up or has no image. External doesnt show anything
The processor gets a little warm, but it should be very warm.
I have checked some voltages. I have also read through the thread but I need some direction.
Took another look, seems the Q5660 right under the fan connector has a bad solder joint.
Still tracking down no display/backlight
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Was the RAM/SODIMM installed when you encounter the above sequences/state? I believe the MBP will not begin to light the screen until POST is successful (chime on power on).
820-2936-b
Hi guys,
I am again here with another pb. that I have on an early 2011 13" mbp. So it has a coke damage with no corosion at all, powers up by keyboard, on bat and/or magsafe, no chime, no image, it stops on keyboard, it's charging, but no chime and no image. I tried a SMC reset but it only powers with fans at max speed when i power it with SMC reset. I changed ram bars, the same result.
What can it be ??? Anyone has an ideea ???
Hi guys,
I am again here with another pb. that I have on an early 2011 13" mbp. So it has a coke damage with no corosion at all, powers up by keyboard, on bat and/or magsafe, no chime, no image, it stops on keyboard, it's charging, but no chime and no image. I tried a SMC reset but it only powers with fans at max speed when i power it with SMC reset. I changed ram bars, the same result.
What can it be ??? Anyone has an ideea ???
I just did some measurements according to this document. I found out that SMC_ADAPTER_EN is not stable, it oscillates ? I can read on my FLUKE multimeter a voltage between the 0.00V - 0.850V, it is going very fast is this normal?
Can somebody help me analyzing this problem? SMC_BC_ACOK is available (3.32V).
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Try disconnecting trackpad and keyboard, maybe some shortcut is 'pressed' on the keyboard. Also try using an external screen.
Can somebody help me analyzing this problem? SMC_BC_ACOK is available (3.32V).
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Try disconnecting trackpad and keyboard, maybe some shortcut is 'pressed' on the keyboard. Also try using an external screen.
Just got another K90i board here and did some measurements, no G3HOT so also the 3.45V missing on pin 5 of the adapter (ADAPTER_SENSE). I get the 16.72V at PPVIN_G3H_P3V42G3H so it seems it is getting power but isn't giving the 3.45V. Is this (U6990) faulty ? Since PPVIN_G3H_P3V42G3H (16.72V) is going IN U6990 and PP3V42_G3H is going OUT (0V, but needs to be around 3.45V)
Is this true?
----- EDIT ---- NEW INFORMATION U6990
I looked at the datasheet and did some more measurements. It all looks OK to me except pin 9 and 10 (6 also concerns me a little)
PIN 1 = 1.242V = UNCONNECTED_85 = 1.216 V internal reference voltage
PIN 2 = 3.77V = P3V42G3H_FB = Feedback input for the switching section:
PIN 3 = 15.2V = P3V42G3H_TON = Switching frequency setting.
PIN 4 = 16.72V = PPVIN_G3H_P3V42G3H = ENABLE (EN) pin
PIN 5 = GND
PIN 6 = 0.01V = P3V42G3H_SW = The SW pin is the switching node
PIN 7 = 16.72V = PPVIN_G3H_P3V42G3H = Input voltage for the switching regulator
PIN 8 = 3.77V = P3V42G3H_FB = Output of a regulator that supplies the main switching controller
PIN 9 = 0V = PP3V42_G3H = VCC BYPASS pin (BYP).
PIN 10 = 0V = P3V42G3H_REF = Integrated 3.3 V high accuracy reference voltage
DATASHEET: http://pdf1.alldatasheet.net/datasheet-pdf/view/529799/STMICROELECTRONICS/PM6644.html
Is this true?
----- EDIT ---- NEW INFORMATION U6990
I looked at the datasheet and did some more measurements. It all looks OK to me except pin 9 and 10 (6 also concerns me a little)
PIN 1 = 1.242V = UNCONNECTED_85 = 1.216 V internal reference voltage
PIN 2 = 3.77V = P3V42G3H_FB = Feedback input for the switching section:
PIN 3 = 15.2V = P3V42G3H_TON = Switching frequency setting.
PIN 4 = 16.72V = PPVIN_G3H_P3V42G3H = ENABLE (EN) pin
PIN 5 = GND
PIN 6 = 0.01V = P3V42G3H_SW = The SW pin is the switching node
PIN 7 = 16.72V = PPVIN_G3H_P3V42G3H = Input voltage for the switching regulator
PIN 8 = 3.77V = P3V42G3H_FB = Output of a regulator that supplies the main switching controller
PIN 9 = 0V = PP3V42_G3H = VCC BYPASS pin (BYP).
PIN 10 = 0V = P3V42G3H_REF = Integrated 3.3 V high accuracy reference voltage
DATASHEET: http://pdf1.alldatasheet.net/datasheet-pdf/view/529799/STMICROELECTRONICS/PM6644.html
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I replaced this IC and still no luck (the old IC I tried on another board, it is working OK). What to do next ?
I tell you to analyze the signal PP3V42_G3H, cmdrdata tell wrong analysis, please check all the components near u7000, because you need PP3V42_G3H in u7000
As you know I'am working now one 2 boards (both K90i).
one with magsafe light on and one without light on magsafe (I did the U6990 measurement on this one)
The one with magsafe light, PP3V42_G3H is present near U7000, the one without light on magsafe does'nt have PP3V42_G3H as you can see in the post above. I thought PP3V42_G3H was created at U6990 or am I wrong ?
Thanks in advance!
one with magsafe light on and one without light on magsafe (I did the U6990 measurement on this one)
The one with magsafe light, PP3V42_G3H is present near U7000, the one without light on magsafe does'nt have PP3V42_G3H as you can see in the post above. I thought PP3V42_G3H was created at U6990 or am I wrong ?
Thanks in advance!
USB comes straight from the northbridge. E.g. The other large BGA package beside the CPU. so if they are all failing it is a common failure point. Unless one device shorting out can affect the others? Not use but unlikely. Might have a bad
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I would check the g3hot rail for a short. With all power disconnected measure the resistance between the 3.4v rail and a ground point. Should be high resistance. If you are seeing less than 1k you probably have a device on the bus pulling it low. Tough to find however. Lots of things powered from the g3hot rail.
Ok on the board with no G3HOT (so also no light on magsafe) I measure a resistance of 8.26k but on a other K90i board I am working on the resistance is 28k (this board does have light on magsafe but won't start)
I am not at home to try on some of my boards to see what is normal. Maybe someone else can chime in with measurement of g3hot to ground measurements. 8k doesn't sound too bad. I was expecting possibly less than 100ohms if there was a problem device dragging the bus low.
Sounds like you need to focus on the circuitry surrounding the g3hot supply to see if something is amiss.
Ok, thanks in advance!
Could it possibly be a bad SMC chip?
Which IC actually 'creates' the g3hot voltage? U6990 or... ?
No, it's a 10 pin qfn packadge. IC PM6640, I post the datasheet and measurements I did on this IC. It is a switching regulator that can be programmed to regulate a fixed value of 3.47 V or it can deliver an adjustable voltage, depending on the FB pin set-up. On the MBP logicboard it is programmed to deliver a fixed value of 3.47V.
As you can see in my measurements some posts earlier, I get the voltage inputs except pin 6, pin 9 and pin 10.
I already replaced this IC but still no luck.
As you can see in my measurements some posts earlier, I get the voltage inputs except pin 6, pin 9 and pin 10.
I already replaced this IC but still no luck.
Ok. That is the one. Sorry. Working from my iPhone
Check the parts around it. Maybe the feedback resistor. There is an inductor and cap on the output. Make sure they are ok. Without a schematic in front of me I am not much help
I made a mistake before, I measured the resistant between the 2 pads you use to power the board on without keyboard. Now I measured the resistance between PP3V42_G3H and GND and it is a short (2.1ohm). I think this short can be caused by a lot of parts on the logicboard, is there some starting point to get it fixed ? (I found this out by measuring C6999 it is near U6990)
Ok. That is the one. Sorry. Working from my iPhone
Check the parts around it. Maybe the feedback resistor. There is an inductor and cap on the output. Make sure they are ok. Without a schematic in front of me I am not much help
Thanks again for both of your replies. The U7000 chip appeared dead to me. Luckily I found someone in a city nearby who sells logicboards. I've swapped my 2009 A1342 with a 2010 A1342 logicboard and now it works great again. Cost was 180 euro's which included a 20 euro discount for handing over my dead logicboard. I chose the 2010 logicboard because the Cpu (2,26 Ghz vs 2,4 Ghz) and Gpu (9400M vs 320M) are a bit faster and the logicboards are compatible. Now all the owner has to do is buy an original magsafe instead of the fake one.
I already powered it up on the bench, without peripherals conected, only screen and magsafe, ram and fan, and it powers up when I connect the magsafe . not shour why !!!
Hi chigwelldave
Can I have please another photo like this one, the same LB but near the LVDS connector ??? the same ress and a litle better quality if posible ???
Thanx