MacBook A1706: Keyboard Replacement Worked for a Minute, Then Fizzled Out

[sekhar203]

Seeking help for a puzzling issue with a MacBook A1706 (820-00923-05 logic board). After successfully replacing the keyboard it worked for a minute and get off, it functioned briefly before shutting off. Has anyone faced a similar issue? Any guidance and advice on how to approach this problem would be greatly appreciated.

 

[2informaticos]

First of all, welcome to the forum!

Machine worked good before?
Did you test connecting known good trackpad flex/board?
Also try disconnecting the battery flex.
Just in case, test in safe mode too.

Inspect for mechanical damage; broken trace, knocked off component.

 

[sekhar203]

Thanks for your inputs, The machine was working perfect before, Actually I replaced only keyboard, it worked for some time but after that It stopped working. the track pad is working perfect, How to go to safe mode? the keyboard is not working, and through external keyboard I'm unable to switch to safe mode.

 

[2informaticos]

I was thinking the keyboard works for 1 minute then stops, each time you power on the machine.
So actually keyboard stopped to worked completely.

Keyboard has embeded electronics.
Its information is encoded and sent to trackpad connector through KBD_I2C_SCL/SDA lines.
Be sure to get all voltages on the keyboard side of J4500.

Test if SMC reset key combination can be done.
If doesn't work, your problem is on the keyboard electronics.
SMC_LSOC_RST_L doesn't pass through trackpad.

Else, may be caused by incorrect pairing keyboard/trackpad.
Check if the keyboard is correct for your MacBook model.
Trackpad firmware doesn't accept any combination.
Shouldn't be the case, if keyboard worked few minutes; but never can be sure.