36
2. No Picture
No picture
Measure U701 PIN2=12V
U702 PIN2=3.3V, U705 PIN2=3.3
Replace U701, U702, U705
Check if X401, X402 oscillate
waveforms are normal
Replace X401, X402
Check if the sync signal from
computer is output and video cable
is connected normally
Input the sync signal of computer, or
change the cable
Replace U401
NG
OK
NG
OK
OK
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 ...
