Circuit Description
PHILIPS Confidential – Do Not Copy 105S5
IV-4
is turn off and Q401 will be on.
3.2
Horizontal output circuit.
Horizontal output circuit is composed by Q401. Horizontal Transistor,T401(FBT ), D401, D402, C401 and
C416. H-Driver circuit output via T402 to switch Q401 ON/OFF to output saw tooth wave and make DY
able to control the circuit scanning of elections in the CRT.
L404, C414, C415 modify Horizontal linearity switching individually via Q414
3.3
EW-Pincushion and width control circuit.
The voltage across C420 can be varied in accordance with vertical parabolic waveform and DC voltage
which is generated by tw o stage drive Q411, Q412, Q409. The peak yoke current is increased in proportion
to the voltage across C414 as the voltage across C420 is decreased for compensating the pincushion effect.
The parabolic waveform and DC voltage are generated from IC401 pin24.
4.
VIDEO
4.1 Video amplifier (IC601).
The video amplifier module is composed of three amplifiers for Red, Green, Blue channel.
The video input signal are fed to the video preamplifier IC601 pin5 is Red, pin6 is Green and pin7 is Blue,
through AC coupling capacitor (C601, C602, C603).
Cut off and drive voltage are controlled by IC301via I
2
C bus . Output of IC601 pin 16 , 15 and 14 to control
the RGB cut off voltage through IC604. Output IC604 are DC voltage for D613, D614 ,D615 and C626,
C627, C628 clamping the RGB cathode voltage.IC603 output amplifier for R,G,B channel.
4.2 On Screen Display (OSD : IC602).
IC602 is the on screen display generator, pin5 for H-blank input, pin10 for V- blank input. The IC602 is
controlled by IC301 via SDA, SCL bus IC602 (pin7, pin8).
The on screen display signal is output from pin13, pin14 and pin15. OSD fast blanking from pin12 for delete
display in area of OSD showing. The fast blanking is active high output = 5V while showing OSD. If no using
OSD, so this pin shall be 0V.
4.3 Auto Beam Limit Circuit (ABL ).
When beam current pass through R447 over 400 uA., the voltage build at base of Q418 will be low enough to
turn on Q418, then the voltage of pin22 of IC601 will be pulled down accordingly to reduce the vide Pre-
amplifier gain output.
4.4 Brightness Control.
Brightness is controlled by varying the DC voltage of RGB output from IC601. Through I
2
C from the IC301..
4.5 Blanking.
Vert : IC501 (TDA9309) pin3 vertical blanking pulse are fed to the base of Q420 to pull down the G1
Voltage to –190 V.
Hor : Horizontal blanking pulse are fed to IC601 pin24 and let video O/P amp cut off during the period of
Horizontal retrace
4.6 Mute
While mode was changing, IC301 pin16 pull high to turn off Q420. The G1 voltage will down to –190V then
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Содержание Color Monitor 105S5
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