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820-4924 "P" Key not working.
- Thread starter Thomas
- Start date
Impossible to have only one key not working because of MLB issue.
The keyboard matrix has more keys connected on every raw and column.
Check again all the keys, you should find other non working ones; maybe special functions.
The keyboard matrix has more keys connected on every raw and column.
Check again all the keys, you should find other non working ones; maybe special functions.
Depending how many keys don't work, the issue is located on a raw, or column.
Unfortunatelly no idea about the matrix layout.
Start checking continuity between J4813 and U4820/30.
Also check all the pull-up resistors R4850-62.
Unfortunatelly no idea about the matrix layout.
Start checking continuity between J4813 and U4820/30.
Also check all the pull-up resistors R4850-62.
Thomas
Member
UPDATE******
Turned out the issue was U4820. Simply reflowed it with some fresh flux and it solved the issue. There must have been some liquid under it. Originally the Logic Board was liquid damaged but showed no liquid damage near the keyboard connector. Anyways all is working perfectly.
Case closed.
Thank you much!!!!
Turned out the issue was U4820. Simply reflowed it with some fresh flux and it solved the issue. There must have been some liquid under it. Originally the Logic Board was liquid damaged but showed no liquid damage near the keyboard connector. Anyways all is working perfectly.
Case closed.
Thank you much!!!!