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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
R933
Q92
IC701
7
Power
ON/OFF
Q92
2
RY92
1
C926
D921
Q94
4
19.7k Ω±
Ω±98Ω Ω Ω Ω
Ω±
Ω±
3
D551
R557
R560
D560
Q541
R561
R559
D561
Q542
R558
C551
IC201
H-Vcc
H.OUT
26
32
Q52
1
B1
C924
Q92
R931
Q92
3
4
Fig.1
RESISTOR
1/4W(27")
X CONNECTOR
2
1
R544
R556
C544
Fig.2
No. 51806
Fig.2
3
2
1
X
CONNECTOR
D551
R556
R544
4
D544
R557
C544
T521
Q531
10
9
D544
AV-27GFH
T522
HV
31
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