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820-3332 Keyboard and track pad not working
- Thread starter tlough75
- Start date
tlough75
Member
My theory is U5701 was slightly damaged due to the corrosion on the TPAD and TPAD Flex. As a consequence the keyboard ceased to function as well. I believe this because other than that the computer works with USB mouse and I am not sure of the keyboard since I do not own an Apple keyboard. Please correct me if my thinking is wrong. I do not have a donor 820-3332 at the moment I am sad to say. I assume since this is an MCU I will have to get it from a like model donor board.
Always good to get chips with firmware from donor board.
But you can compare different schematics and pull it off, if connector-chip traces have same configuration.
Give it a try, it may work...
But you can compare different schematics and pull it off, if connector-chip traces have same configuration.
Give it a try, it may work...
tlough75
Member
Good evening. So I was able to get a donor 820-3332-A board to transplant U5701. We now have a working keyboard and TPAD! So my theory was correct as well as your reccomendations 
. The liquid damage that was on the TPAD and cable killed poor U5701. The customer didn't know because they had no back light either. I replaced the BL fuse and restored BL but noted the keyboard and TPAD were not working possibly due to corrosion seen on the TPAD flex. On to the next one! Thanks 2informaticos!
. The liquid damage that was on the TPAD and cable killed poor U5701. The customer didn't know because they had no back light either. I replaced the BL fuse and restored BL but noted the keyboard and TPAD were not working possibly due to corrosion seen on the TPAD flex. On to the next one! Thanks 2informaticos!
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