Acer X193W Manuale di servizio - Pagina 37
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3. Panel Power Circuit
Check CN402 PIN1 should have
response from 0V to 5V When we
switch the power switch from on to off
Replace panel
4. Keypad Board
OSD is unstable or not working
Is Keypad board connecting normally?
Is Button Switch normally?
Is Keypad board normally?
Check main board
OK
OK
OK
OK
Check the PPWR panel power relative circuit Q301, Q302
In normal operation, when LED =green, Q301B =5 V,
NG
If PPWR no-response when the power switch
Turn on and turn off, replace the U203
NG
NG
NG
37
Connect Keypad Board
Replace Button Switch
Replace Keypad Board