Technical information

3. Panel Power Circuit
Check CN407 PIN 23-24 should have
response from 0V to 5V When we
switch the power switch from on to off
OK
Check the PPWR panel power relative circuit,Q702, Q705
Q703 In normal operation, when LED =green, R706
Should =5 V,
If PPWR no-response when the power switch
Turn on and turn off, replace the U401-MST9251A
Replace panel
NG
4. Keypad Board
OK
OK
Is Keypad board connecting normally?
Is Button Switch normally?
Is Keypad board normally?
Connect Keypad Board
Replace Button Switch
NG
NG
NG
OK
Replace Keypad Board
Check main board
OSD is unstable or not working
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