Sony KE-50XBR900 Service Manual ▷ View online
31
Tester Checking 3
Fuse
Fuse Resistance
on High Voltage Board
(R1)
Fuse Resistance on High Voltage Board
(R2)
R1
R2
R1 OK: About2.2 Ω
NG： Opened
R90 OK: About2.2 Ω
NG： Opened
R90
R2 OK: About2.2 Ω
NG： Opened
Fuse Resistance on High Voltage Board
(R90)
Resistance and Chip Fuse
on High Voltage Board
32
Tester Checking 4
Data IC
Data Relay Board (Right)
Check between #1 pin and #2 pin (GND)
（
Vd Voltage Line of Data IC）
OK: Opened
NG: Shortage
Check the resistance between #1 pin and #2 pin (GND) with tester.
In case of shortage, it is caused by malfunction of data IC.
Check the surface of data IC after removing the heat sink and Take some pictures.
33
Tester Checking 5
Parts Location
High Voltage Board
PH2203F
34
Tester Checking 6
Power HIC
PH2203F on High Voltage Board
Checking point
Between A and B Between C and U Between J and O
Between A and U Between F and U Between L and M
Between B and C Between G and H Between P and T
Between B and E Between H and J Between Q and T
Between B and M Between I and J
Between B and N Between J and K
L
F
PH2203F
A
B
C
B
C
D
E
F
E
F
G
H
Turn this board over, and Check each points
PH2203F
G
H
M
E
D
C
B
A
Judgment
OK： more than ＫΩ
NG：Shortage
I
K
J
N
O
P
Q
R
S
T
U
I
J
K
L
M
N
O
P
Q
S
R
T
U
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