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rvanpruissen

macrumors newbie
Mar 18, 2013
13
0
Board view request

Could somebody please help me with a schematic and board view file for the 820-2327-A logic board? It belongs to the late 2008 non-pro unibody MacBook.

I've been trying to use other schematics from that period, but they differ too much.

Cheers
 

saronno

macrumors newbie
Mar 16, 2013
25
0
Mmmm ... doing some test here and there I find that magsafe
provide an instable voltage. It work correctly with other macbook
but with this one it's like trying to supply voltage it finds
something wrong.

Does anyboby experience something like that?
Maybe faulty ISL6259?
If I connect the battery, 12V line is fine but 3.4V line is pulled down
by something to 0.9V.

I removed q7085 ..... nothing change ... today I will try to remove q7080
and see if short disappear.

Of course, any idea is welcomed :D
 

saronno

macrumors newbie
Mar 16, 2013
25
0
Some updates.
I attached my scope to the board
and see what happen when you attach the magsafe ...

photo0014lp.jpg

This is the main line ... you have a spike (you can't see it completely in these
photo) an exponential decay and a stable voltage for some ms ...
and again and again and again ...

I don't think this is unusual .... but I think magsafe is reset by sense line
because it finds something wrong.

photo0013e.jpg

This one instead is the sense line.
The problem is ... what is the protocol used to communicate between
magsafe and logic board?
 
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macelek01

macrumors newbie
Sep 14, 2012
22
0
a1342 doesn't wake up from sleep mode

Hello Everybody,

I have an a1342 macbook unibody white. It's work fine, but it doesn't wake up from the sleep mode. It can go to sleep mode (the hall sensor detects when the lid is closed), but it doesn't wake up. I tried the SMC and PVRAM reset, but these weren't usefull. I replaced the hall sensor board and SMC on the logic board and I've already checked the lid sensor line, but everything is ok. The number of logic board is 820-2883-A.
Has anyone any idea?

Thank's a lot!

Bence
 

techno96

macrumors regular
Sep 10, 2009
110
272
Does anyone know where the power pads are on the June 2012 13 inch MacBook Pro?

Can't seem to find a service guide for it
 

Dadioh

macrumors 65816
Original poster
Feb 3, 2010
1,123
36
Canada Eh?
where can I find the power pads? 2012 MPB

Macbook Pro 13" 2011 version is highlighted in attachment. The picture you posted of 2012 model seems different. Just double check that one of them is G3Hot 3.4V.
 

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rvanpruissen

macrumors newbie
Mar 18, 2013
13
0
Hi macattack600,

To my understanding you're looking for an 820-2327 schematic. I've attached the schematic of that particular logic board. Also included is the board view file, you will need this to identify the missing compontents.

Kind regards,

Rick


Anyone have spare board might could measure these broke off resistors and capacitors or point me to page on schematic to find? Thankx
 

Attachments

  • A1278_820_2327_M97_schm and brdview.zip
    1.7 MB · Views: 942

Dadioh

macrumors 65816
Original poster
Feb 3, 2010
1,123
36
Canada Eh?
Could anybody help me to solve this problem? :)

Thank you!

Not waking from sleep is usually software or firmware related in my experience. I think you said you tried resetting SMC and PRAM? Maybe try that again.

From a Hardware perspective the sleep circuit is a magnet in the lid and a hall effect sensor in the body. On the A1278 models that is integrated into the Battery Indicator Light cable. But if yours is going to sleep when you close the lid then it suggests that circuit works.
 

macelek01

macrumors newbie
Sep 14, 2012
22
0
Not waking from sleep is usually software or firmware related in my experience. I think you said you tried resetting SMC and PRAM? Maybe try that again.

From a Hardware perspective the sleep circuit is a magnet in the lid and a hall effect sensor in the body. On the A1278 models that is integrated into the Battery Indicator Light cable. But if yours is going to sleep when you close the lid then it suggests that circuit works.

Thanks your answer.

I found the faulty of the logic board. This is an amplifier IC, which drives the loud speaker. It was short-circuited and it didn't allow to wake up the macbook. I replaced it today since then it has worked fine.
 

Dadioh

macrumors 65816
Original poster
Feb 3, 2010
1,123
36
Canada Eh?
Thanks your answer.

I found the faulty of the logic board. This is an amplifier IC, which drives the loud speaker. It was short-circuited and it didn't allow to wake up the macbook. I replaced it today since then it has worked fine.

Wow. Good sleuthing. Never would have thought that the audio system and ability to wake from sleep could be connected. Note for future reference.
 

Southwest

macrumors newbie
Feb 22, 2013
12
0
Hi Southwest

I also would like to order it from Ebay or dealer in Asia but my problem is that I don't know the exactly name of this component.. therefore it's almost impossible to order something that you don't even know the name..:).

Could you tell me the name or the ebay link of this component?

Thanks a lot the patience..

Pecociulo

Received the new U6901 if you are still in need let me know. Have not tried them yet. Very busy at work, if you can or know of someone who would be able to install it, we could work something out on the component.
 

macelek01

macrumors newbie
Sep 14, 2012
22
0
Wow. Good sleuthing. Never would have thought that the audio system and ability to wake from sleep could be connected. Note for future reference.

I never think too that this is the faulty components. I find only that because when the mac tried to wake up, I heard a very small knock on the loud speaker. Than I replaced the amplifier ic and it worked :)
 

the13

macrumors newbie
Mar 31, 2013
2
0
focsani, romania
nice work here

hello to everyone, i need an advice.
macbook pro early 2009 820-2565-a with the symptom:
no start, no boot no charging... nothing (no start after reset) 0v on battery.
if i connect the adapter from another mac (working one) with led on green its stay green, if the adapter was charging the other mac and the led is orange, when connected to the non working mac its stay orange. After a random time (minutes) the led change to green approximately off. in all situation i have the same current (g3hot=3.4v, fuse near battery 12.5v, pin 14 from charging ic 3.4v, 0v on battery + connector)

thank you for the time
 

Attachments

  • G3Hot_location.jpg
    G3Hot_location.jpg
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erto275

macrumors newbie
Apr 3, 2013
1
0
a1342 doesn't work

hi everyone,

I have a problem with my unibody macbook 2009-10, it does not charge, the MagSafe and the MagSafe ac in-board are new. It normally operates with a charged battery.
could someone tell me which fuse burn?
the charger does not light green or orange :confused::confused::confused:
 

NielN

macrumors newbie
Apr 5, 2013
2
0
Germany / Hessen
A1278 Board dead?

Hey,

I've got an A1278 here. It's got the following symptoms:

- Battery disconnected; MagSafe lights green. G3_Hot OK, Voltage on fuses OK.
-- Doesn't start at all. No Fans, no chime, nothing

- Battery connected, MagSafe connected (green light)
-- Pressed the power Button then (after 3-5 seconds) the MagSafe light went out.

Then I swapped the Power IC (TI 51125)... Now it did the following:

- Battery disconnected or connected; MagSafe lights green. G3_Hot OK, Voltage on fuses OK.
-- Press Power / Pin 5 -> Nothing

Right now I measured: Main Fuse: 12,48 V, MagSafe: pulsing between 17,15 and 16,80 V.

//////////

EDIT: I just found out that my MagSafe died :-( So I'll be up for another diagnostics when I bought a new one...
 

vdeluca

macrumors newbie
Apr 8, 2013
1
0
Does anybody have an idea what this error code is from apple hardware test?

4SNS/1/40000000:IBOR-9.166

Symptoms : laptop is fine, CPU does not clock above 800mhz.

Late 2011 MBP.

Fixed from water damage using info in this thread! Many thanks to all who have participated so far.

My assumption is this is a sensor. I've looked and temps are all okay. Battery is fine.

cynic, can you provide info about what happened to your mbp, regarding 4SNS/1/40000000:IBOR-9.166 issue ?

I'm experiencing the same error, and the mbp became too slow.

my best,
 

rvanpruissen

macrumors newbie
Mar 18, 2013
13
0
Missing diode?

Hi guys,

I'm working on an M97 board with water damage and with no response whatsoever (no boot, no post, no chime, no charger light, etc.). G3HOT is available though.

After searching (a lot) I've discovered D7010 is missing, a Schottky Barrier diode between PP18V5_G3H_CHGR and CHGR_DCIN.

In my limited electronics knowledge I'm guessing this is a sensing input for the SMC. I've ordered some Schottky Diodes, but could someone tell me if this could be the source of all my problems, or should I check other stuff first, before replacing D7010?

Thanks guys, I'm learning every day on this forum! Hear hear ;)

Kind regards,

Rick from the Netherlands
 

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  • M97 missing Schottky Diode.jpg
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  • Location D7010.jpg
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dlaptop

macrumors newbie
Apr 9, 2013
1
0
G3HOT Dead no LT3470 to be found?

Hi,

I too am working on an A1278 MBP 13 mid 2010 2.4 C2D EMC 2351 logic board. The laptop is dead since there's no G3HOT buss. I do measure 16.2V various places on the logic bd. I found the SMC start pads and there's no G3HOT on either side. Working from a schematic found here I have found that the G3HOT is dead. I was able to follow the pwr in from magsafe to the 7149 FET's and it there but at this point the schematic says it goes to U6990 LT3470A which I can't find on my board. I've been looking at both a K6 schem and a K24 which I believe both are different from the 2351. Can anyone help with any info. I want to say thank you to this board's members as they have been helpful in the past.

Thanks
Dave
 

rvanpruissen

macrumors newbie
Mar 18, 2013
13
0
Hi,

I too am working on an A1278 MBP 13 mid 2010 2.4 C2D EMC 2351 logic board. The laptop is dead since there's no G3HOT buss. I do measure 16.2V various places on the logic bd. I found the SMC start pads and there's no G3HOT on either side. Working from a schematic found here I have found that the G3HOT is dead. I was able to follow the pwr in from magsafe to the 7149 FET's and it there but at this point the schematic says it goes to U6990 LT3470A which I can't find on my board. I've been looking at both a K6 schem and a K24 which I believe both are different from the 2351. Can anyone help with any info. I want to say thank you to this board's members as they have been helpful in the past.

Thanks
Dave

In the pictures below, U6990 and accompanying cap and res are highlighted on a K6 board. Hope you find the culprit.
 

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  • R6905 on K6 board.jpg
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Gromerpyle

macrumors newbie
Apr 10, 2013
3
0
Macbook pro 13" 2009

Hi, I have a MBP 13 in 2009, probably water damaged, it is stone dead, except that the charge is working and charging the battery. green LED on the MagSafe. I have measured G3Hot and it is 3.4V and I've checked all the fuses and they are intact. I have also measured in slightly different places on the card and there is power here and there. but I discovered that if I measure at pin 8 on the bios chip, it is grounded .. should not it be at 3.3v? so I was wondering where I should try now? I have tried to short-circuit power pads but nothing happens. does anyone have any idea?

sorry for my bad English.
/ Calle
 

rvanpruissen

macrumors newbie
Mar 18, 2013
13
0
Hi, I have a MBP 13 in 2009, probably water damaged, it is stone dead, except that the charge is working and charging the battery. green LED on the MagSafe. I have measured G3Hot and it is 3.4V and I've checked all the fuses and they are intact. I have also measured in slightly different places on the card and there is power here and there. but I discovered that if I measure at pin 8 on the bios chip, it is grounded .. should not it be at 3.3v? so I was wondering where I should try now? I have tried to short-circuit power pads but nothing happens. does anyone have any idea?

sorry for my bad English.
/ Calle

Did you check the capacitor(s) stabilising the VCC? Otherwise trace the 3.3V line back to: alternate ROM support section and PP3V3_S5_ROM at the power supply (U7200). In other words, is there 3.3V anywhere on the board and if so, find the place where it stops along the line.

I know, I make it sound easy ;) Happy measuring!
 
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