820-00165 No Keyboard Mouse

[Instafixx]

Macbook Air A1466. On/Off Button triggers but keyboard mouse not working.

Installed the board on a different chasis altogether to rule out any part issue. But still the same.

Also changed the flex but still the same.

 

[2informaticos]

TP/KB not working in boot menu also?

 

[Instafixx]

Unable to enter boot menu or recovery mode because keyboard not responding. On/Off Button still works.

 

[2informaticos]

Then check L4820 and R4830.
You can try to bypass them.
Be sure to get all power rails at J4800.

 

[Instafixx]

J4800 Power Rails all are okay.

PP3V3_S4_IPD is at 2.9V. Shouldnt it be 3.3V ?

 

[Instafixx]

Tied Point 1 and Point 2 of L4820
Did the same for R4830.

No Change.

 

[2informaticos]

Keep them bypassed.

Do you get 3V at pin 1/J4800?
Check voltage at pins 12 & 15, before and after macOS started.

 

[Instafixx]

Before and After Macos Started
Pin 13 is 2.5V and Pin 15 is 3.3V

Getting Pin 3.4V on Pin 1

I dont know how i missed it but there is corrosion around C8000 and U8000.

Although diode mode reading of C8000 is 0.257

U8000 just fell off the board. Let me replace it and get back

 

[Instafixx]

Components Replaced. Working Fine Now

 

[Instafixx]

Having a weird problem here. Some keys working when entering the password but not working post Macos login.

Example a,i 0 8 etc.

What can be the issue ?

 

[Instafixx]

Settings Issue. Solved