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4. U4-DATA OUTPUT
Measured X401 waveform is
normal?
Check GM2321 (U401)
Signal output.
Is the waveform ok?
Check HS/VS input signal are
normal?
Replace U401
8.2.2 KEYPAD BOARD
Is Keypad Board connecting normally?
OK
NG
OK
OSD is unstable or not working
Y
Is Button Switch normally?
Y
Is Keypad Board Normally?
Y
Check Main Board
NG
Replace X401(14.318MHz)
OK
Check relative circuit to
panel
NG
Check relative component
N
Connect Keypad
N
Replace Button Switch
N
Replace Keypad Board
Page 30 of 44
Lenovo LXM-L19BH
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