Dell E153FPc Service Manual page 41

9.2.3 Key Board
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OSD is unstable or not working
Is Keypad board connecting normally
OK
Is Button Switch normally
OK
Is Keypad board normally
OK
Check main board
manuals search engine
NG
Connect Keypad Board
NG
Replace Button Switch
NG
Replace Keypad Board
41
Dell E153FPc