Trouble Shooting; Main Board - HP L1950 Service Manual

19" LCD Color Monitor

9.2 Trouble Shooting

9.2.1 Main Board

1、No power
No power
Press power key and look if the
picture is normal
NG
Please reinsert and make sure the
AC of 100-240 is normal
OK
Measure U701 PIN 2=3.3V
Q403 = 3.3V
OK
X201 oscillate waveforms are
normal
NG
OK
Replace U401
NG
NG
Measure CN401 PIN5/6=5V?
Replace X201
38
Reinsert or check the
power section
Chec Check power section
TXD
Replace U701/Q403
HP L1950