Circuit Description
PHILIPS Confidential – Do Not Copy 105S5
IV-3
V-sync (pin2) From IC301 pin32.
c. Output.
∗
B
+
Driver (pin28).
∗
H-Driver (pin26).
∗
EW-Driver (pin24).
∗
Vout (pin23).
2.1.1
Horizontal.
a.
H-sync inputs through pin1, then take a HFLB pulse from FBT pin5 to IC401 for AFC to make pin26
H-Driver output at the same time.
b. Pin5 and pin6. C429, R471, control horizontal hold in range.
2.1.2
Vertical.
a.
V-sync outputs from M CU IC301 pin33 to IC401 pin2, then IC401 release V.out from pin23, pin21, to
IC501 TDA9309 pin7, pin1.
b. V.outputs to vertical hold in range is controlled by pin22 IC401 (C508).
2.1.3
B
+
control.
Take a pulse from FBT pin5 and accumulates to become a DC voltage via D423, C437, then transformed by
VR403 to a conjunction to IC401 pin15 (
≅
5V) outputs pulse by pin28 via Q202 to boost converter circuit.
2.2
Vertical deflection.
a. IC401 pin23 output to IC501 (TDA9309) pin7, then IC501 pin5 and pin7 make vertical deflection
output.
b. Vertical blank (IC501) pin3 take a blanking pulse. After passing Q420 buffer can supply video
blanking signal.
2.3
Boost converter.
The Booster converter mainly composes of n -channel MOSFET Q202 choke L201 capacitor C204 and
rectifier diode D204. IC401 pin28 B
+
driver output via Q204, Q205, Q202 to driver Booster converter
and provide a DC-voltage to provide B
+
H-output circuit use As H-freq. Change IC401 pin28 B
+
driver will
change its output. Booster converter will also change the B
+
it provides H-freq. will varies from 30K ~
56KHz, B+ will vary from 68V ~ 150V.
2.4
X-RAY radiation protection.
FBT pin5 output one pulse to pass through D423 and C437 integration DC voltage and through D418,
ZD4054 to IC401 pin25. When anode voltage abnormal increase FBT pin5 and IC401 pin25 voltage to be
increased too. As IC401 pin25
≅
8 V
IC401 X-RAY protection circuit immediately active H-Driver and B-
Driver , VOUT no output. The X-RAY radiation protection circuit is used in this monitor is a latching type
the monitor will shut down and continue until turn -off the monitor with power switch.
3. HORIZONTAL
3.1
Horizontal driver circuit.
The output of IC401 pin26 H-Driver connect to Q402 H-Driver transistor makes Q402 active ON/OFF
Functions push H-output Q401 to reach secondary via induction of T402. For T402 is a transformer of
reduced voltage and converted pole, Q401 will be turn off when Q402 is on (on the contrary) when Q402
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Содержание Color Monitor 105S5
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