Sony KDL-43W950C / KDL-50FA95C / KDL-50FA97C / KDL-50W950C Service Manual ▷ View online
37
Troubleshooting
KK board Side A
Troubleshooting Reference
R4533
C
N
4501
F4500
F4501
1
2
3
4
R
4554
R
4553
R
4552
R
4560
R
4559
R
4558
R
4557
R
4556
C4512
C4532
C4534
IC450
5
L4503
L4502
L4500
L4501
C4515
C4516
C4517
C4518
38
Troubleshooting
KK board Side A
Troubleshooting Reference
C
N
4501
1
2
3
4
8
13
19
23
24
5
CL450
7
CL450
8
CL451
0
CL450
9
39
Troubleshooting
KK board Side B
Troubleshooting Reference
JL775
0
JL775
1
JL775
3
JL775
2
8
7
6
5 4 3 2
1
C
N
4505
(SI
D
E B)
40
Troubleshooting
3-3-4. KK board Power ON checking (for Dual Acoustic Duct Subwoofer Lch & Rch) for KK board (XM-DT) only
No
Checking Item
OK
NG
If NG
If NG
1
Check
IC4505 side-terminal of
L4500,L4501,
L4502,L4503
Switching Freq = 384kHz or 768KHz
±20KHz
Vrms = don’t care
No switching
frequency at
either one of the
CL
Go to next checking.
2
Check F4500, F4501 Main
SP
(for KK board only)
V(before fuse) = 19.5V ± 0.5V
V(after fuse) = 19.5V ± 0.5V
No voltage.
Check fuse broken?
Check CN4501 Pin 1 & 2
got 19.5V?
Change fuse (5A).
Check power supply
board audio VCC.
3
Check IC4505 (Pin 5) at
R4533
(for KK board only)
V(before R4533) = 3.3V ± 0.5V
V(after R4533) = 3.3V ± 0.5V
No voltage.
Check +3.3V_MAIN
supply.
4
Check R4557, R4558,
R4559, R4560
Vdc = 3.3V ± 0.3V
Vdc < 0.8V
R4558 NG,
Check IC4505
R4557, R4559 NG,
Check IC1000
5
Check R4552, R4553,
R4554, R4556
R4556 = 12.288MHz
R4553 = 3.072MHz
R4552 = 48KHz
R4554 = moving CLK
All Vp-p ≈ 3.3V
If no frequency
at R4552,
R4553, and
R4556, Muffin
IC (IC1000) NG.
If no frequency
at R4554 make
sure sound
source OK.
If sound source OK, but
at R4554 = NG, Muffin
IC (IC1000) NG.
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