Philips 190VW9FB/97(1) Service Manual page 47

(2) W / LED, No Backlight
Check CN902 pin4 = 16V
Check ON/OFF signal
Check IC801 PIN2=5V
Check IC801 PIN1, 15 have the output of square wave at short
Check Q805 and Q806 PIN5, 6, 7, 8 have the output of square wave at short time.
Check the output of T801
OK
Check connecter & lamp
OK
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
Check adapter or MB
Check Interface board
Check Q801 and ZD801
Change IC801
Check Q805, Q806
Change T801
47 HUDSON 9