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820-00239 a1706 -2016 A1706 (EMC 3071) NOT DETECTING FLASH

M

manumathew.017

Member
History:- I got this unit with key board not working and same time extremely slow... External keyboard was working, System was slow even after disconnecting J4500. It was taking too much time to boot.

1) I have tried to clean ME using medusa... That didn't solve the problem
2) I had some images got from forum, Not sure working or not..First image successfully programmed.
3) After that the flash stopped detecting , Medusa giving error CHIP NOT DETECTED

No idea whats went wrong, At the moment macbook is not booting anymore
 
2informaticos

2informaticos

Administrator
Staff member
Aaaa, you are trying through J6100.
In such case, 3V from Medusa can be used and USB-C charger is not needed.
The voltage is available on pin 2 of the 6 pins (not mounted) connector, near the Port A.
Solder a convenient wire, to provide 3V3_SUS for MLB.

However, 3V3_SUS is not controlled by U6100.
Reprogramming SPI chip (even externally), will not bring back 3V3_SUS.
You should check the power on sequence.
 
M

manumathew.017

Member
One of the pin in the Medusa port A connector was bad. Fixed it and programmed the flash. Now I could see just a question mark on the screen.... Not booting ☹️
 
M

manumathew.017

Member
Yes J9600 is good,
With the old image, the system was booting, But the system was terribly slow.
With the new image, it's not finding boot media.
Another observation I can go to recovery mode only when I remove the J9600, No idea whats going on
 
M

manumathew.017

Member
I have tried a different image for flashing, With this one, I could boot the machine.
But still, the keyboard is not working and at the same time terribly slow......One thing is sure Bios is not the one slowing down the machine.

I don't know the system slowness and keyboard issue is related or not, Should I check anything else before removing the board?

If someone needs a working bios program here it is

a1706_820_00239 - Google Drive

drive.google.com drive.google.com
 
2informaticos

2informaticos

Administrator
Staff member
Start in diagnostic mode and tell us if some error pops up.
The ALS works correctly?
Test the machine with external monitor, disconnecting internal LCD.
 
2informaticos

2informaticos

Administrator
Staff member
ALS = Ambient Light Sensor.

Did PRAM reset?
Fsys checksum fixed after reflashing BIOS?
Did you clean ME for sure?

Save important data and reinstall macOS.
 
M

manumathew.017

Member
PRAM reset - Yes doesn't help
ME clean - Yes, Doesn't help
ALS - The brightness of display working through touch bar
Fsys checksum - I wasn't, Just did now, It's reported no change...... Doesn't help
 
M

manumathew.017

Member
Just a doubt, I don't see the fans running while booting/after pressing the power button, Is it normal?
But the fans are functional when I run diagnostics test
 
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