37
3. Panel Power Circuit
4. Keypad Board
Check CN407 PIN 23-24 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,Q702, Q705
Q703 In normal operation, when LED =green, R726
Should =5 V,
If PPWR no-response when the power switch
Turn on and turn off, replace the U401-MST9259BH-LF
OK
NG
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
Summary of Contents for AL2251W
Page 1: ...1 Acer AL2251W Service Guide ...
Page 9: ...9 LCD Monitor General Specification ...
Page 10: ...10 ...
Page 11: ...11 LCD Panel Specification General Specifications ...
Page 12: ...12 Optical Specifications ...
Page 13: ...13 Supported Timing ...
Page 24: ...24 b The Description For Function Control LEDS ...
Page 25: ...25 ...
Page 31: ...31 Fig 7 6 Remove the screws to remove the frame of the panel Fig 8 9 Fig 8 Fig 9 ...
Page 32: ...32 Fig 10 7 Remove the screws to remove the base back cover Fig 11 12 Fig 11 Fig 12 ...
Page 34: ...34 10 Remove the screws to remove the main board Fig 15 16 Fig 15 Fig 16 ...
Page 41: ...41 Exploded Diagram Model AL2251W ...
