Philips 190S7 Service Manual page 46

19" LCD Color Monitor
Inverter Board
No power
Check C811 (+) =12V
OK
Check ON/OFF signal
OK
Check U811 pin 2=12V?
OK
Check U811 Pin1/pin15 have the output of sawtooth wave at short time
OK
Check Q821/Q841 pin5/pin8 is 12V?
OK
Check PT801/PT802 pin7/pin8= 650V?
OK
Replace backlight
NG
Check adapter section
NG
Check Interface section or main board
NG
Check Q801
NG
Check U811 pin 5/pin6
OK
NG
Cut all the pin connector of Q821/Q841, check C811 (+)=12V?
Replace Q821/Q841
NG
Unplug backlight connector wire, check
PT801/PT802 pin7/pin8 = 650V?
OK
Replace PT801/PT802
46
NG
Replace U811
NG
OK
NG
190S7
Check Q801