Philips 190B9CS/00 Service Manual page 49

(2) W / LED, No Backlight
Check CN902 Pin7 = 12V
Check ON/OFF signal
Check IC801 PIN11=5V
Check IC801 PIN8, 9 or PIN6, 10 have the output of square
Check Q805 and Q806 PIN5, 6, 7, 8 have the output of square wave at short time.
Check the output of PT801
OK
Check connecter & lamp
OK
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
Check adapter or MB
Check Main Board
Check R802
Change IC801
Check Q805, Q806
Change PT801
HUDSON 9 49