Inverter - Philips FL9.1 Technical Training Manual

Inverter (Figure 9)
The inverter power supply is switched On by the BACKLIGHT-SW line from the digital board.
The BACKLIGHT-ADJ line is fed to IC1000 to control the pulse width output of IC1000 and
the brightness of the backlight. The outputs to the backlights are fed to over voltage protec-
tion circuits. If a problem is detected in one of the outputs, Q1600 is turned On causing the
Protect 3 line to go Low. This will cause the set to turn Off.
System Control (Figure 10)
Control signals from the Function board and IR Sensor board are routed through the power
supply board to IC3301. IC3301 preforms all of the system control functions.
Note that the P-ON-HI voltage in pin 5 of CN101 is inverted from the pin with the same label,
CN301, pin 9.
Inverter Board
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