A2251 820-01949-A KEYBOARD AND TRACK PAD NOT WORKING

[isc]

I test other keyboard but not working
there is no liquids on touch pad or cables or connectors

 

[2informaticos]

Keyboard information goes through trackpad circuitry.
So trackpad problem will also let keyboard unresponsive.
Check if J6701 gets all required voltages.
Be sure U6860 and its resistors and traces are all good.

 

[isc]

U6860 measurements
pin 1 1.8v @ r6803
pin2 0v @ 2pin ************ SPI_TPAD_CLK missed
pin 3 1.8v @ 3pin
pin 4 1.8v @ r4867
pin5 1.8v @ 5pin
pin 9 3.3v @ r6874
pin 10 3.3v @ r6871
pin 11 0v @ r6875 ************ SPI_TPAD_3V3_CLK_R missed
pin 12 3.3v @ r6873

 

[2informaticos]

Can you post useful information?

 

[isc]

Can you post useful information?

now ok ?

R4852 20 OHM OK
R4715 2.9 KOHM OK
SPI_TPAD_CLK impedance to GND at R4852 37 KOHM

 

[isc]

 

[2informaticos]

Did you check ohm value of the resistors U6860 related?

"Check if J6701 gets all required voltages."
?

 

[isc]

 

[2informaticos]

Voltages look good.

Tried known good trackpad flex/board?