MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

[Hijo]

Hi to all.

The motherboard starts when i press the power button, and then restart itself after 10sec. After the MB restart itself: -When the magsafe connected the fan are spinning normaly, -When only battery connected, fan are spinning at the maximum (It rises gradually).

The magsafe look good, have green light and orange light when battery plugged.

So i would check PP3V42_G3H signal, but i really don't know how to do this safe and i'm a little bit scarryed.

Here is the schem and diagram: https://1fichier.com/?9u8rkczfe6

Can someone tell me what i must do to check PP3V42_G3H signal ?

Thx !

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

I think i have understand how to take mesure, please tell me if i'm wrong.

I have passed test for PP3V42_G3H and P3V42G3H_FB like this:

This is circuit of P3V42G3H_FB:

So i have placed my black probe on ground (usb) and my red probe on red circle like this:


Then i have tested PP3V42_G3H, same way -> Ground on usb and red on red circle here:


Iff i'm in the good direction by testing like this, i have:

PP3V42_G3H : 3.44V
P3V42G3H_FB: 1.25V

Thanks..

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Ok so.. If i'm in the good way by testing like i do, there is a list of test à i have done:

check magsafe (only) connected:

PPBUS_G3H: 12.61V on Probe: 1444 Pin: 1 (SMD.)
PP3V42_G3H: 3.44V on Probe: 860 Pin: 1 (SMD.)
P3V42G3H_FB: 1.25V on Probe: 1540 Pin: 1 (SMD.)
PP3V3_S5: 3.34V on Probe: 1102 Pin: 1 (SMD.)
PP1V2R1V05_S5: 1.06V on Probe: 929 Pin: 1 (SMD.)
PM_SLP_S3_L: 0.00V on Probe: 1162 Pin: 1 (SMD.)
PM_SLP_S4_L: 0.00V on Probe: 1528 Pin: 1 (SMD.)
PP3V3_S0_DPILIM: 0.25V and gradually down to 0V

So at this point i think there should be a problem on PM_SLP_S3_L and PM_SLP_S4_L. Perhaps U9480 is fucked up ?

What do you think ?

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Have you done the simple things like try a known good ram IC and a known good HD?

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Hi, MB start always by the same way. With or without Ram. The HD is good i have recovery my data.

Motherboard disconnected to all (Hdd, lcd, keyboard..) and she ever start at the same way that i have explain in my first post..

thank anyways

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

So are you saying that your system will boot up without a ram chip? So G17 and H17 are the PM_SLP_S3_L and PM_SLP_S3_L on page 21 in section C3 and C4 This is their source which will be conditioned on the processor voltages, frequencies, temperature readings, and Rom input. These lines then go into RC delay conditions to enable various sections of the computer.

[dellxps15]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

i see nvidia bga. check if vga coil is shorted or not.

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

@Keeney123: Oh sorry, i came from many forum and now i've forgets to tell some basics informations.
So, the system don't boot, in any way. The MB (MotherBoard) starts but no 'boing', black screen, no backlight keyboard (I have already check it, no corosion or anything else).
So motherboard start fans are spinning, hdd start but system don't boot, no sound, no display.

Thanks for your answers, i'm gonna watch out in those direction and come back.

I'm sorry for my poor english

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Thank for your explaination keeney123 !
Hi dellxps15. I think i have already see your investgation on Macrumor forum. Thank to be here on my problem too.

So, i don't find out the VGA coil. From Rossmann vids i found that



But my understanding of his english is bad, but i learn

Can u please tell me where is the coil you are talking about in this pic ? (For a largest size: Right click -> display the picture.)



Thanks.

Note: I have tested PP3V3_S0 on Probe 2 Pin1 and had 0.00V.


Edit: I'm not sure how to take mesure to know if there is a short or not. By 'short' you mean 'continuity' ? Did i need to connect the magsafe for taking this measure ?
Thank you

Edit2: I have some difficulty to find information about how to read the datasheet value. For this next example, can you tell me what are some values:



On R3842 (69.8K, 1%, 1/16w, MF-LF, 402)
C3840 (0.1UF, 20%, 10V, CERM, 402)
how can i read these information and did i need to connect all time the magsafe for requesting the value on the logicboard?

Thanks again

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Have you tried plugging in another display into RGB port or the HDMI port if you have one? To see if the display is bad? The other thing you might try is to unplug the the unit, take out the battery and take out the real time clock battery, then press and hold the power button for 30 sec. Then connect the RTC battery and the power cord and see if it boots up. These are the simple things that can be done before you check out the voltages, crystals, thermal sensors that may cause your unit to shut down.

[rookieme]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Vga coil seems to be L8920.
If it is shorted you should see less that 4 ohm to ground.
Normally I think should be 8-10 ohm.

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Thank for your explaination keeney123 !
Hi dellxps15. I think i have already see your investgation on Macrumor forum. Thank to be here on my problem too.

So, i don't find out the VGA coil. From Rossmann vids i found that



But my understanding of his english is bad, but i learn

Can u please tell me where is the coil you are talking about in this pic ? (For a largest size: Right click -> display the picture.)



Thanks.

Note: I have tested PP3V3_S0 on Probe 2 Pin1 and had 0.00V.


Edit: I'm not sure how to take mesure to know if there is a short or not. By 'short' you mean 'continuity' ? Did i need to connect the magsafe for taking this measure ?
Thank you

Edit2: I have some difficulty to find information about how to read the datasheet value. For this next example, can you tell me what are some values:



On R3842 (69.8K, 1%, 1/16w, MF-LF, 402)
C3840 (0.1UF, 20%, 10V, CERM, 402)
how can i read these information and did i need to connect all time the magsafe for requesting the value on the logicboard?

Thanks again

So are the conditions on this reg chip TPS51125 U7201 (PAGE 64) met to output VOUT2 ? This also can be seen on page 4 section B-4 and 5

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Tanks for your answers !

@Keeney123: I dont have any port rgb or hdmi to test it. But the motherboard start as the same way when i unplug lcd. So i don't think LCD is the cause.

I'm gonna test your second method when i'm gonna rebuild the mac, but do you think this is the RTC battery ?



@rookieme: I have 0.4 Ohms from the ground to this coil (L8920) (Pin1 & pin 2)

[dellxps15]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Tanks for your answers !

@Keeney123: I dont have any port rgb or hdmi to test it. But the motherboard start as the same way when i unplug lcd. So i don't think LCD is the cause.

I'm gonna test your second method when i'm gonna rebuild the mac, but do you think this is the RTC battery ?



@rookieme: I have 0.4 Ohms from the ground to this coil (L8920) (Pin1 & pin 2)

this should be g3hot 3.42 volt coil. 0.4 in diode mode on vga coil should be ok

shot is 001 002 (except on 19volt rail that could be also more then 100 indiode mode).

when running check voltage on all coils present on board is they have any voltage. try also with a mini display port to vga adapter and see if u get apple logo. try also a pram reset and an smc reset.

check also in the spchematic if gpu pwr ok is present on smc-mcp.

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

this should be g3hot 3.42 volt coil. 0.4 in diode mode on vga coil should be ok

Ok thank you.

shot is 001 002 (except on 19volt rail that could be also more then 100 indiode mode).

I dont understand what you mean by 'shot is 001 002'..

when running check voltage on all coils present on board is they have any voltage.

L9701: Pin1: 0.00V, Pin2: 0.00V
L7260: Pin1: 3.34V, Pin2: 3.34V
L7220: Pin1: 0.00V, Pin2: 0.00V
L9560: Pin1: 0.00V, Pin2: 0.00V
L9510: Pin1: 0.00V, Pin2: 0.00V
L7030: Pin1: 12.62V, Pin2: 12.32V, Pin3: 0.00V
L8920: Pin1: 0.00V, Pin2: 0.00V
L7770: Pin1: 1.06V, Pin2: 1.06V
L7560: Pin1: 0.00V, Pin2: 0.00V
L7330: Pin1: 0.00V, Pin2: 0.00V
L6995: Pin1: 3.4V , Pin2: 3.4V
L7660: Pin1: 0.00V, Pin2: 0.00V
L7100: Pin1: 0.00V, Pin2: 0.00V
L7101: Pin1: 0.00V, Pin2: 0.00V

try also with a mini display port to vga adapter and see if u get apple logo. try also a pram reset and an smc reset.

I'm gonna try to get a cable adapter to vga.
I've already try to reset smc and pram, nothing happened..

check also in the spchematic if gpu pwr ok is present on smc-mcp.

I have nothing named GPU_PWR_OK..
One thing is named EXTGPU_PWR_EN and one other is named GPU PWRSEQ.

take out the real time clock battery

I can't find anything who seems to be a RTC battery :/

Thank you for your help

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

It is a round flat lithium battery. They often put in on the hardest side of the motherboard to get to. If the LCD screens works the same as the TV screens then if one back light does not power on the system is shut down very quickly. Have you verified the voltages on Magsafe adapter when it is not connected to the computer to make sure all voltages are there? I know you said you say the LEDs light, but I always like to see that the voltages and grns are there.

From Wikipedia
MagSafe-Pinout.svg
Male connector, front view
Pin 1 GND (0 V)
Pin 2 V+ (14.5 / 16.5 / 18.5 / 20 V DC)
Pin 3 Charge control pin
Pin 4 V+ (14.5 / 16.5 / 18.5 / 20 V DC)
Pin 5 GND (0 V)

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Hi

I have already test 16.7V on those pin when magsafe is connected and green.

I think RTC battery is an super-capacitor on this macbook, no ?

[Hijo]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

SO i have tested J6900 and have (magsafe only)
16.67V on PIn 1 & Pin 2,
0.00V on Pin 3 & Pin 4,
3.33V on Pin 5.

Thank for your help

[keeney123]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

Looks like who ever wrote the article on Wikipedia make a mistake as their pin out is different then yours. Either that or the schematic is wrong, which I do not think it would be. I guess the RTC Battery could be a super cap. I am not an expert at apple computers. I know more about PC which have a battery, but still not an expert. One other question have you seen this computer work with this adapter?

[dellxps15]

Re: MacBook Pro 2.66Ghz mid2009 MB 820-2523-b to repair

u have normal voltage on macbook as they are g3hot voltage 12.5 volt, g3hot 3.42 volt and 3.3 always volt.

after these voltage are present macbook should start after pressing power botton.

check boardview pressing N and look for smc_onoff_l

u should have one spot in the other side of the board, hear hdd cable keyboard cable, speaker cable..... that zone. and yes they are 2 bigger pads near smc chip u4900. if magsafe has green light try shorting that 2 point with a tweezer. let us know if macbook start.