Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
Here follows my update.
After a huge fight with the Logic Board, where I've reflowed the MCP and the CPU with a hot air gun the symptoms kept the same.
One thing I've remembered while in desperation was to correlate this issue with the Wifi board malfunction and Bingo!!!
After disconnecting the Wifi/camera cable from the logic board the MBP booted normally and started working without any major issues.
Then I've unplugged the Wifi board and the MBP kept booting,...
Pgratis
Member
Last Activity: 12-13-2020, 10:17 AM
Joined: 06-07-2020
Location: Barreiro
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Re: Macbook Pro A1706 820-00239 No power, No liquid
Hi,
Do you have a microscope?
You should take a close look on the area around where you have replaced the cap.
Having a flow of hot air around that area might have moved other components (even on the other side of the logic board).
Did you took any measurements on the power rails?
With your multimeter in diode mode to see if you have connection to the ground on the power rails.
BR,
PMALeave a comment:
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
I've replaced the DIMM with new 1066MHz version.
I was able to reboot the MBP once and run the ASD EFI without any errors but I have to stopped it because the computing was getting very hot and the fan was spinning in normal speed which could damage the logic board.
Now when I try to start it I see the fan spinning hear the DVD drive seek but get the black screen and no chime.
Taking out the 1066MHZ DIMM and putting the 1333MHz DIMM alone in either slot I can have the...Leave a comment:
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
I've tried several techniques to identify what is happening with this logic board but I'm on a dead end.
With the correct DDR3 modules:
- I've measured the power buses and all seems to be ok.
- I've heated up the logic board (using a hot air gun) to see if some capacitor would start working, but no fun either.
The computer keeps POST works ok with the higher speed DDR3 modules.
Any ideas?
Thanks.
BR,
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
On the board view that would be "PP3V3_S0", right?
I've measured 3.25VDC on a resistor that was connected to that line.
I've also measured the DIMM VDD "PP1V5R1V35_S3" and it measures 1.48VDC.
BR,
PMALeave a comment:
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
I've cleaned the board, replace the thermal grease and remounted the system but still the same behaviour.
I've tried to use the original DIMM on both slots but there is no boot.
With the 1333MHz DIMM's the boot goes up to 50-60% and then starts looping.
Any ideas?
Thanks.
BR,
PMALeave a comment:
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
I can't reset PRAM with the "official" DIMM's because I never get the white boot screen, but I've done it several times with the higher speed DIMM's, so I believe that part is don.
I've cleaned the board out of dust but I'm having doubts how to clean the RAM slot contacts.
Thanks.
BR,
PMA...Leave a comment:
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Re: Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
I know I need PC3-8500 for it to work (I've been using one original DIMM to trick the chipset to lower the frequency for quite a few years now).
I've tried 3 different PC3-8500 modules from a working Mac but this motherboard refuses to boot with all of them.
I've reset the SMC (with keyboard and by removing the battery) to see if the chipset would start to collaborate, but this MBP now only "likes" PC3-10600 DIMM's.
I'm adding some photos of the motherboard....Leave a comment:
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Macbook Pro 2010 13" A1278 (EMC 2351) boot loop
Hi,
I have one MBP 13" that started to refuse to boot.
Two months ago the WiFi chip stopped working but that was solved by putting a Wifi USB dongle (the Aliexpress Wifi Module is on it's way since early April).
This weekend the MBP didn't started. When pressing the power button I saw some activity (the led was on and I got the DVD head sound, but black screen and no chime).
After some time I've replaced the current DIMM's (1 original 2GB PC3-8500 + 1 PC3 10600) that have worked without issues since 2012, with new DIMM's.
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Re: New Members - please post your introductions here
Greetings from Portugal.
My name is Pedro, I'm 46, and have an Electronics Engineer degree.
I like to try to fix stuff, hope to find good hints in this forum, learn more and, if possible help someone else.Leave a comment:
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