No. 51806
AV-27GFH
31
HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT
1. HIGH VOLTAGE HOLD DOWN CIRCUIT
After repairing the high voltage hold down circuit shown in Fig. 1.
This circuit shall be checked to operate correctly.
2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT
(1) Turn the POWER SW ON.
(1) As shown in Fig.2, set the resistor (between
【
X
】
connector
【
1
】
&
【
3
】
).
(3) Make sure that the screen picture disappears.
(4) Temporarily unplug the power cord.
(5) Remove the resistor (between
【
X
】
connector
【
1
】
&
【
3
】
).
(6) Again plug the power cord, make sure that the normal picture is displayed on the screen.
T901
D922
C551
C924
D921
RY92
1
B1
Q92
2
Power
ON/OFF
R558
R933
D560
R560
Q541
R559
Q542
R561
Q92
7
C926
3
R556
2
1
D544
R544
HV
T522
4
10
Q531
9
X CONNECTOR
C544
R557
D551
IC701
Q52
1
H.OUT
32
IC201
26
Q94
4
Q92
3
Q92
4
D561
H-Vcc
T521
Fig.2
R931
Fig.1
RESISTOR
19.7k
Ω±
Ω±
Ω±
Ω±
98
Ω
Ω
Ω
Ω
1/4W(27")
C544
R557
3
2
1
X CONNECTOR
R556
D551
R544
D544
Fig.2