SMC Issue on MBP 13 - Hardware Troubleshooting Guide

[mac-n-sauce]

Both of my A1278 schematics (K6 and K24 versions) shows R7020 as having a resistance of 0.02 Ohms. If R7020 is 1.8 Ohm, it would have to be handle several amps of current flowing thru it. Package type is just it, has nothing to do with resistance values. It specifies physical size and power dissipation/handling capability. Rnumber is just schematic notation. I've NEVER seen a resistor labeled with Rnumber.

Just a thought: if that one in the picture is R7020, the value is perhaps 0.02 ohm (The designation of R020 on the part could be interpreted as .020). So if you measured that resistance as 1.8 ohm, I'd venture that the pictured resistor is R7020 and it is blown, and what you are measuring is the impedance of the surrounding circuitry.

I am going to buy a board view tomorrow. I have windows on my mac so I can view it.

 

[Musicsoul78]

Is that the one that was on this forum? If so it is the late 2008 early 2009 2.53Ghz with dual fans. I think he has the mid 2009 2.53.

Just an update: I r/r the IC chip. Now I have no pulsing magsafe. 6.8v on pin 21
5.7v pin 24.

Starts with battery shorting G3hot. Still no start with magsafe.
Fan ran high speed.
My Q7001(on bottom by LVDS) that I replaced because it had a broken pin1 is not getting the voltage right
Q7000(on top by DC Jack) has pins 1-4 at a fluctuating 16.8v-17.09v
Pin 5 fluctuating as high as .26v
Checked LT4370 pins measured good
The R7020 Measures open. I believe this is located just south west of the Q7001 can you confirm.

Mac n sauce i do have the mid 2009 model

 

[cmdrdata]

Mac n sauce i do have the mid 2009 model

Mac-n-Sauce: See my edited post #825

 

[kilgrinus]

33w

 

[Musicsoul78]

Mac-n-Sauce: See my edited post #825

i did it mentions the r020 in reference to R7020??

 

[cmdrdata]

Wow, these posts by musicsoul, macnsauce and myself are getting convoluted and long. Let's restate the system type and problem descriptions as you have it now (since the failure types have changed since start of this specific thread) and we'll start from there.

 

[Musicsoul78]

Wow, these posts by musicsoul, macnsauce and myself are getting convoluted and long. Let's restate the system type and problem descriptions as you have it now (since the failure types have changed since start of this specific thread) and we'll start from there.

LogiC board 820-2533-b
OK System is Mid june 2009 single fan
IC Charger
Pin 14 reads 5.8v
Pin 1 reads 18.5v

sorry to confuse you man im still in awe of the spectrograph view of that logic board! it helped me big time as well as mac n sauce pin layout guide.

if i have to desolder and resolder that tiny ass lil IC chip ... Ohm my Im DEAD

Musicsoul + Soldering = F-

i am getting low power shocks if i hold my iphone when plugged into powered device and when laptop is on magsafe/ac power. it seems as if its not being earthed correctly.. right??

 

[cmdrdata]

LogiC board 820-2533-b
OK System is Mid june 2009 single fan
IC Charger
Pin 14 reads 5.8v
Pin 1 reads 18.5v

i am getting low power shocks if i hold my iphone when plugged into powered device and when laptop is on magsafe/ac power. it seems as if its not being earthed correctly.. right??

U7000-1 being 18.5v is BAD. Under normal condition, this pin should have been logic low, thus allowing the voltage divider R7060/R7061 to provide 7v or so to the gate of Q7060 (Inrush limiter). Another indication that your CHARGER IC is probably toast.

 

[mac-n-sauce]

LogiC board 820-2533-b
OK System is Mid june 2009 single fan
IC Charger
Pin 14 reads 5.8v
Pin 1 reads 18.5v

sorry to confuse you man im still in awe of the spectrograph view of that logic board! it helped me big time as well as mac n sauce pin layout guide.

if i have to desolder and resolder that tiny ass lil IC chip ... Ohm my Im DEAD

Musicsoul + Soldering = F-

i am getting low power shocks if i hold my iphone when plugged into powered device and when laptop is on magsafe/ac power. it seems as if its not being earthed correctly.. right??

This needs to be done with a hot air station at around 450-500c. You will not be able to do it with a soldering iron. Sorry, I am making an assumption that you are not using one!

----------

Wow, these posts by musicsoul, macnsauce and myself are getting convoluted and long. Let's restate the system type and problem descriptions as you have it now (since the failure types have changed since start of this specific thread) and we'll start from there.

I agree. i will update shortly. I have the board view files now so I am going to take a look at them to see what is what. Get back a little later.

Thanks again for your help on this.

 

[U-234]

High CPU Usage only on battery, with DCIN OK

I will try to post it again since my question apparently was overlooked, hopefully someone had this problem or knows more than I do.

Issue: My MBP 13" CPU usage spikes to 98% when running on battery.
The kernel_task consumse all of the CPU power. When plugging back megsafe everyhing goes down to normal CPU usage 1-10% Temperatures in iStat around 45-50(C)

Also, the AHT revealed this error: 4SNS/1/40000001: YPOR-0.592

If someone can shed some light on this I would really appricate it.

I heard it might be a sensor issue? Or IC Charger ISL6259 issue?

 

[cmdrdata]

I will try to post it again since my question apparently was overlooked, hopefully someone had this problem or knows more than I do.

Issue: My MBP 13" CPU usage spikes to 98% when running on battery.
The kernel_task consumse all of the CPU power. When plugging back megsafe everyhing goes down to normal CPU usage 1-10% Temperatures in iStat around 45-50(C)

Also, the AHT revealed this error: 4SNS/1/40000001: YPOR-0.592

If someone can shed some light on this I would really appricate it.

I heard it might be a sensor issue? Or IC Charger ISL6259 issue?

I've never seen your problem, but in searching for ISL6258 (Apple proprietary) I come across ISL9218 which is very similar to 6258. Your problem could be due to ISL6259 since one of the signal going to it is the "pin29" (actually substrate pad) that is the thermal sensor. Googling your error code seemed to indicate a sensor error of some sort.
I am attaching pinout and block diagram of that chip for others to see.

 

[U-234]

I've never seen your problem, but in searching for ISL6258 (Apple proprietary) I come across ISL9218 which is very similar to 6258. Your problem could be due to ISL6259 since one of the signal going to it is the "pin29" (actually substrate pad) that is the thermal sensor. Googling your error code seemed to indicate a sensor error of some sort.
I am attaching pinout and block diagram of that chip for others to see.

Thanks for replay. Yes you right the PIN29 is the center big thermal pad that feeds to the other components I put in the picture below. So you think I should measure that for Voltage, Resistance and compare with the working LB? I'm just thinking since it is fine on DCIN only and the problem appears ONLY when using battery, than it might be our connection to the IC Battery charger.

 

[Musicsoul78]

U7000-1 being 18.5v is BAD. Under normal condition, this pin should have been logic low, thus allowing the voltage divider R7060/R7061 to provide 7v or so to the gate of Q7060 (Inrush limiter). Another indication that your CHARGER IC is probably toast.

its defo toast now as i shorted pin 14 by getting another read now it will not power up at all and have test the v on other pins.

im selling this on ebay grrr had enough

BTW
thank you for all your help its been awesome i learnt so much these past few weeks i will be passing on my knowledge.
i have a new quest to gather as many logic board schematics and store them in a place where everyone can access them. so make sure every one posts their own and i will collect and share to help the rest.

 

[cmdrdata]

I've never seen your problem, but in searching for ISL6258 (Apple proprietary) I come across ISL9218 which is very similar to 6258. Your problem could be due to ISL6259 since one of the signal going to it is the "pin29" (actually substrate pad) that is the thermal sensor. Googling your error code seemed to indicate a sensor error of some sort.
I am attaching pinout and block diagram of that chip for others to see.

As you can see in the upper left of the CHARGER IC block diagram, the SMC and MCP talks to it via the SCL/SDA lines regarding system status and sensors. When you are powering by battery alone, the CHARGER is in a partially shutdown mode i.e., ISOLATE_ADAPTER etc, GATE SIGNALS to the 12v FET switchers and some sensors may return an un-expected value due to problems elsewhere. I just don't have an answer.

 

[mac-n-sauce]

its defo toast now as i shorted pin 14 by getting another read now it will not power up at all and have test the v on other pins.

im selling this on ebay grrr had enough

BTW
thank you for all your help its been awesome i learnt so much these past few weeks i will be passing on my knowledge.
i have a new quest to gather as many logic board schematics and store them in a place where everyone can access them. so make sure every one posts their own and i will collect and share to help the rest.

Hey, why give up so easy that IC chip is $6 and pretty easy to replace!

 

[mac-n-sauce]

Trying to figure out how to order this Inductor from my MBP 13" 2010.

It is at the Firewire port
CRITICAL L4310 FERR-250-OHM
Can anyone help?
It looks like a big resistor.
I am trying to find it at Digikey, but the schematic does not give the specifics

 

[jlsinger]

MBP a1287 mid 2010 Dead, except...

Well, so far I've posted two questions and no response to either.

Do I need a special handshake for a reponse?

I have a mid-2010 a1287 13" MBP. I have green LED on charging cable that turns to amber indicating a charge. No power except I do hear the drive spin up and then stop both on battery and AC when power button is pressed. I can do SMC bypass and I get fan at full speed as well as charger showing green and then back to amber. I do not have functioning backlight at the moment.

I have checked the 12v fuse near battery connector and it is good, but need help diagnosing from there.

Any help would be GREATLY appreciated.

ANYONE????

 

[cmdrdata]

Well, so far I've posted two questions and no response to either.

Do I need a special handshake for a reponse?

I have a mid-2010 a1287 13" MBP. I have green LED on charging cable that turns to amber indicating a charge. No power except I do hear the drive spin up and then stop both on battery and AC when power button is pressed. I can do SMC bypass and I get fan at full speed as well as charger showing green and then back to amber. I do not have functioning backlight at the moment.

I have checked the 12v fuse near battery connector and it is good, but need help diagnosing from there.

Any help would be GREATLY appreciated.

ANYONE????

See this forum for backlight issue: https://forums.macrumors.com/threads/972699/

 

[mac-n-sauce]

See this forum for backlight issue: https://forums.macrumors.com/threads/972699/

Any ideas on my Inductor?

 

[jlsinger]

See this forum for backlight issue: https://forums.macrumors.com/threads/972699/

Thank you, cmdrdata.

However, I cannot do much with the backlight problem until I can get this MBP to boot up. With SMC bypass I do not see the LCD display come up. I had replaced the LED driver and had to solder a cap. I unfortunately had battery connected when I soldered the cap and realized too late (should not have been working on this so late in the evening!). Thus I now have a non-booting MBP.

Before this, I had a working MBP with no backlight.

 

[cmdrdata]

Any ideas on my Inductor?

Nope. My advice is to get a similar board and use that as a "parts bin".

 

[cmdrdata]

Thank you, cmdrdata.

However, I cannot do much with the backlight problem until I can get this MBP to boot up. With SMC bypass I do not see the LCD display come up. I had replaced the LED driver and had to solder a cap. I unfortunately had battery connected when I soldered the cap and realized too late (should not have been working on this so late in the evening!). Thus I now have a non-booting MBP.

Your problem is somewhere past the main power supply issue that has been the main topic in this forum. The fact that you have amber LED is indicative that your main power system (magsafe or battery) are ok and is able to charge the battery. However, Macs also check secondary power supplies (5.1v, 3.3v, 1.2v etc), I/O devices (USB, firewire, superdrive etc.), and who knows what else before it will commence booting. It has to be past the "bong" sound before it will begin a system boot. I don't have much experience or knowledge on how to isolate your issue. I think there is a signal called something like "ALL_PWR_GOOD" that may prevent your system from booting, but I don't recall which part of the schematic it is for your system.

 

[jlsinger]

Your problem is somewhere past the main power supply issue that has been the main topic in this forum. The fact that you have amber LED is indicative that your main power system (magsafe or battery) are ok and is able to charge the battery. However, Macs also check secondary power supplies (5.1v, 3.3v, 1.2v etc), I/O devices (USB, firewire, superdrive etc.), and who knows what else before it will commence booting. It has to be past the "bong" sound before it will begin a system boot. I don't have much experience or knowledge on how to isolate your issue. I think there is a signal called something like "ALL_PWR_GOOD" that may prevent your system from booting, but I don't recall which part of the schematic it is for your system.

Thanks again, cmdrdata!

Hopefully someone can chime in and help me a bit further. I recall someone else in a thread from this site having an identical issue while I was trying to search for a similar problem, but got no response. I figured this thread was as close as I could get. Maybe I will get lucky!

 

[mac-n-sauce]

Thanks again, cmdrdata!

Hopefully someone can chime in and help me a bit further. I recall someone else in a thread from this site having an identical issue while I was trying to search for a similar problem, but got no response. I figured this thread was as close as I could get. Maybe I will get lucky!

Do you have the schematic?

 

[jlsinger]

Do you have the schematic?

Only the k24. Which schematic should I have?