Philips 22PFL4505D/F7 - Page 33

9-5
LED Backlight Drive Block Diagram
PL10.10BLBD
MAIN CBA
PROTECT3
BACKLIGHT-ADJ
BACKLIGHT-SW
TO SYSTEM CONTROL BLOCK DIAGRAM
IC1033(LED BACKLIGHT DRIVER)
OVP
Q1031
CN873
DRIVE1
VREF
Q1028
Q1029
Q1035
CONTROL LOGIC
26 13
1
28
24 14 17
LCD MODULE ASSEMBLY
19 23
+24V
DRIVE2
3 2
DRIVE3
5 4
DRIVE4
7 6
LED DRIVE
Q1032
LED DRIVE
Q1033
LED DRIVE
Q1034
LED DRIVE
COMP14 +66.2V6 COMP23 COMP32 COMP41