ViewSonic P95f+-1 Service Manual page 15

external H-deflection circuit by adjusting the phase of the HDRV output pulses. The phase between
H-flyback and H-sync can be controlled at pin30.
X-ray Protection
The X-ray protection input pin2 provides a voltage detector with a precise threshold. If the voltage
exceeds this threshold for a certain time, an internal latch switches the whole IC into protection
mode. In this mode several pins are forced into defined states:
Pin8 (HDRV) is floating
Pin6 (BDRV) is floating
Pin12, 13 (VOUT 1, 2) are floating
Pin16 (CLBL) provides a continuous blanking signal.
Vertical Oscillator
The vertical free –running frequency is determined by the resistor R602 at pin23 and capacitor
C602 at pin24. Usually the free-running frequency should be lower than the minimum trigger
frequency.
5-3 PFC CIRCUIT
Between rectifier and loading, it is connected a DC-DC switch transformer .Through input current Ii
wave following AC input sinusoid voltage wave, Ii may approach sine wave, and input THD may
less than 5%,power factor may improve more 0.9.IC905 is by power factor correction IC.Q910 is
DC-DC power switch transistor, R916,R195 is used as divider.
5-4 TRANSISTOR & DIODE CIRCUIT
LOCATION
D101
Q101
D411
D412
Q405
Q410
Q403
Q413
Q415~ Q419
Q429~ Q433
D705
D701
D702
D703,D704
Q707
Q705, Q706
Q701
BD901
D909
D907
D906
ViewSonic Corporation
FUNCTION AL DESCRIPTION
For C103 Discharge
For LED Indicator Control
Speed up for Q403
Damping Diode
B+ Mute Control
Horizontal Driver
Horizontal Out Put
Horizontal Linearity Correction Control
Horizontal S-Correction Control
Horizontal S-Correction Control
Buffer Diode
Rectifier for 250V Supply
Protection Diode for Q708
Rectifier for -200V Supply
Picture Mute Control AMP
Brightness Control CKT
Vertical Dynamic Focus Control AMP
Bridge Rectifier for AC Source
Rectifier for Start Power Supply
Clip Diode for Snubber CKT
IC901 VCC Supply
12
Confidential – Do Not Copy
P95f+/B-1