BenQ M2400HD Service Manual - Page 48
Measure U701 Pin2=3.3V, U702 Pin2=1.8V
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24" LCD Color Monitor (2) No picture No picture BenQ E2400HD Check if the Pin 3, 4 of CN701 are 5V input NG Check power board OK Measure U701 Pin2=3.3V, U702 Pin2=1.8V NG OK X401 oscillate waveforms are normal Replace U701, U702 OK NG Replace X401 Check U401 OK NG Replace U401 Check if the sync signal from computer is output and video cable is connected normally NG Input the sync signal of computer, or change the cable 48
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24” LCD Color Monitor
BenQ E2400HD
48
(2) No picture
No picture
OK
NG
X401 oscillate waveforms are
normal
Replace X401
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
NG
OK
NG
Check U401
Replace U401
Measure U701 Pin2=3.3V, U702 Pin2=1.8V
OK
NG
Replace U701, U702
Check if the Pin 3, 4 of CN701 are 5V input
Check power board
NG
OK