Pwpc Board; Block Diagram - Sony S95E Service Manual

5.2 PWPC board

5.2.1 Block diagram

PWPC board combines to adapter and inverter, this design has the merits in predigesting constructions,
reducing cost and improving product's capability.
Adapter which commonly consists of bridge rectifier and filter, start circuit, PWM control circuit
(TOP247Y), protection circuits and convert to 12V, 5V DC voltage by input 90V-240V AC voltage that
provide power supply for each chips in the main board and inverter.
Inverter is DC TO AC circuit. It changes the 12v DC of power supply to about 600-800v AC that drives
the backlight. It mostly consists of starting circuit, PWM controller, DC changing circuit, LC surging circuit,
output circuit and protection circuit etc.
AC input
EMI filter
OSC and
Output
Circuit
Lamp
Feedback
Circuit
Interface of main board and PWPC board
Bridge
Rectifier
Start Circuit
R904、R908
PWM
Control IC
DC Convert
Circuit
Over
Voltage
Rectifier
Transformer
CMOS
MOSFET
Q203/Q204
PWM
Control IC
31
S95E Sony
Over
12V
Voltage
Protect
ON/OFF
ON/OFF
Control
DIM
CN902
5V