820-02536 no keyboard

B

bartech

Member

Apr 9, 2025

• #1

Water damage, at beggining no trackpad no keyboard i check and find short on ut320 and ut350 . chnge them and trackpad start working, i try working keybord and new board connecting keyboard and nothing change. What next to check?

 

2informaticos

Administrator

Staff member

Apr 9, 2025

• #2

So its MLB doesn't work with known good keyboard?
Be aware, the KB and TP must match on the new models.

 

B

bartech

Member

Apr 9, 2025

• #3

keyboard not working whit good used keyboard, all parts original

 

2informaticos

Administrator

Staff member

Apr 9, 2025

• #4

Then the problem must be around JT201, or its connections to JT400.
Check first all LT20x coils (page 85).

 

B

bartech

Member

Wednesday at 2:40 PM

• #5

i check connections and find that lines i2c_kbc_slc and i2c_kbd_sda wasnt connected i make new connection but keyboard not working... backlight of keyboard work, power button work and touchbar working.

 

2informaticos

Administrator

Staff member

Wednesday at 4:01 PM

• #6

Did you check direct connections between JT201 and JT400?

Check all JT201's power rails.
Also check pins 21 & 27.

 

B

bartech

Member

Thursday at 11:15 AM

• #7

checked all connections two times even on keyboard connector on that little board get some power in keyboard but still nothing. i check pin 21 and 27 and change ur300 but still the same.

 

2informaticos

Administrator

Staff member

Thursday at 11:50 AM

• #8

The must be something else affected by corrosion...