Haier L42C1180 Service Manual page 29

7. OSD is unstable or can't work normally
OSD is unstable or can't work normally
Key board connected properly?
Enter factory mode to do "Reset"
Yes
Buttons are OK?
Yes
Key board is OK?
Yes
No
Replace the main board
No
Reconnect the key board
No
Replace the button function
No
Replace the key board
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