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3. Panel Power Circuit
4. Keypad Board
OK
OK
OSD is unstable or not working
Is Keypad board connecting normally?
Is Button Switch normally?
Is Keypad board normally?
Check main board
Connect Keypad Board
Replace Button Switch
Replace Keypad Board
OK
NG
NG
NG
Check CN301 PIN1 should have
response from 0V to 5V When we
switch the power switch from on to off
Replace panel
Check the PPWR panel power relative circuit Q301, Q302
In normal operation, when LED =green, Q301B =5 V,
If PPWR no-response when the power switch
Turn on and turn off, replace the U202
OK
NG
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