Philips 190V7 - Page 47

19” LCD Color Monitor 190V7
47
Inverter Board
No power
Check C811 (+) =12V
NG
OK
Check adapter section
Check ON/OFF signal
Check Interface section or main board
NG
OK
Check U811 pin 2=12V?
NG
OK
Check Q801
Check U811 Pin1/pin15 have the output of sawtooth wave at short time
NG
OK
Check U811 pin 5/pin6
NG
OK
Replace U811
Check Q821/Q841 pin5/pin8 is 12V?
Check PT801/PT802 pin7/pin8= 650V?
Cut all the pin connector of Q821/Q841, check C811 (+)=12V?
O
K
NG
Unplug backlight connector wire, check
PT801/PT802 pin7/pin8 = 650V?
OK
NG
Replace backlight
Re
p
lace PT801/PT802
OK
NG
NG
Replace Q821/Q841
Check Q801
OK