View source for MacBook Pro 2021 A2442 Water Damage No Keyboard Repair

{{Repair Guide
|Device=MacBook Pro A2442
|Affects parts=Keyboard L16A
|Needs equipment=Soldering Iron, Hot Air rework station
|Type=Soldering
|Difficulty=3. Hard
}}
{{stub}}

==Problem description==
Water damage causes the keyboard to stop working either completely or have some keys not working.
[[File:359191833.jpg|thumb|PCAL6416A Chip (Figure 1)]]

==Symptoms==

*All keys not working (typing), some keys not working.

==Solution==
===Diagnostic Steps===

Visual inspection of board shows corrosion.
===Repair Steps===
Located at UT101, check for corrosion or damaged components. Replace the chip at UT101 and check around UT105, and UT102 for any corrosion/damage. The chip code is PCAL6416A, in QFN package.

You can only get it from scrap boards. Same chip is used in older Macs, like A1502 and A1398, but in BGA package; useless here.

You can find QFN package in other M1 model, like A2338.

It is also available on T2 models, like A2251, A2289.

Just open schematics and search in pdf for "PCAL64"; then (if found) be sure it is HWQFN package (not BGA).