820-4924 no KB T-Pad

[G.Beard]

Liquid, very bad but mainly around SSD J3700 which needed to be replaced.

EDIT. Trackpad is working. Keyboard not working

KeyBoard not working.
Same KB and T-Pad / cable are working with a good board

I have tested KB connector pin voltages against a working board with T-Pad plugged and unplugged.

With defective board T-Pad plugged in, J4813 pin 27 = 0.23V, along with any other pin connecting to U4820 = 0.23V
With working board T-Pad plugged in, J4013 pin 27 = 0V, along with any other pin connecting to U4820 = 0V
With working board T-Pad NOT plugged in, J4813 pin 27 = 0.3V, along with any other pin connecting to U4820 = 0.3V


With T-Pad plugged and unplugged. J4813

Pin 1 is 0V
Pin 2 is 0V
pin 3 is 0V
pin 4 is 3.4
pin 5 is 3.4
pin 6 is 0.27
pin 7 is 0.27
pin 8 is 0.27
pin 9 is 0.27
pin 10 is 3.3
pin 11 is 3.3
pin 12 is 3.3
pin 13 is 0.27
pin 14 is 0.27
pin 15 is 3.3
pin 16 is 3.3
pin 17 is 3.3
pin 18 is 3.3
pin 19 is 3.3
pin 20 is 3.3
pin 21 is 3.3
pin 22 is 3.3
pin 23 is 3.3
pin 24 is 3.3
pin 25 is 0.2
pin 26 is 0.34
pin 27 is 0.34
pin 28 is 0.34
pin 29 is 0V
pin 30 is 3.3 2


J4802

I2C_IOXP_SCL = 0.5V, R4823 2k

 

[G.Beard]

I tried replacing U4820, no change. Anyone please?

 

[2informaticos]

U4830 is connected to the same IOXP bus.
Post resistance to ground on both SCL/SDA lines.
Change U4830 if doubt...

 

[G.Beard]

U4830 is connected to the same IOXP bus.
Post resistance to ground on both SCL/SDA lines.
Change U4830 if doubt...

There was a broken via on SDA.

Sweet mate, thanks