CV & XV Power Supply

Concept

LPF (Filter Circuit)

PFC

(Power Factor Correction Circuit)

RESONANT POWER CIRCUIT

(For Panel Power & Signal)

AC DETECT CIRCUIT

SW

POWER_TV

AC_DETECT

24V_INV

(To Inverter)

POWER_PROTECT

12V_LCD

POWER_LCD

POWER_SIG

24V18V_AUDIO(To 12V-DDcon for Audio Output Circuit)

12v (To 6V-DDcon for Tuner other)

12v (To 9V-Dropper for DSP other)

12v (To 6V-DDcon for Digital Circuit)

5V1 (To TV Micro VCC_DDR)

PROTECT CIRCUIT

PRO

TEC

T

OVP

PRO

TEC

T

OVP

QE90 MP1591DS-LS-Z

12V Reg

STAND-BY POWER CIRCUIT

(For TV Micro)

5V

POWER 42CV505D : PE0546

380V

Frequency characteristics

Power SupplyPower SupplyWorking RangeWorking Range

PSU basic operation

14

4

BASIC OPERATION

PSU effect of output voltage increas

14

4

F+

Higher Current Higher Current

Frequency up

CONTROL

VOLTAGEINCREASE

AC INPUT

Surge Prot. Relay

24V FROMMAIN POWER

Power IC

318V

22V

13 Pins

Sens

e 0v

or 2

v

Freq

. Con

t.

27V

REF

.

Int.

Reg

..

T/C

Ove

r I.

Output Switching

From STBY PWR

12V From PFC

To PWR Protect

Power Supply Layout

P801 AC Mains Input

F801 8A Fuse

D820 Bridge Rectifier

SR81 Surge Prot. Relay

Q820/Q821 PFC FET’s

IC820 PFC Control IC

F820 2.5A Fuse (PFC out)

F840 800MA Fuse (Stby. In)

Q860 Resonant Power

Q840 Standby Power

P801

F801

D820

SR81

Q820/Q

821

IC820

Q860

IC840

F820

F840

24v_INV

18v_Audio

24v

Power_TV

12v

5V1

Power_Protect

12v_LCD

Power_LCD

AC-DET

PFC_OUT 380v

Vcc (Standby 16V)

Vcc (Resonant Power 22V)

Voltage Measurement Points

Power_SIG