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  • KDL-46W950A, KDL-46W954A, KDL-46W955A, KDL-46W957A, KDL-55W950A, KDL-55W954A, KDL-55W955A, KDL-55W957A

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Model
KDL-46W950A KDL-46W954A KDL-46W955A KDL-46W957A KDL-55W950A KDL-55W954A KDL-55W955A KDL-55W957A
Pages
127
Size
54.97 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / COMMON
File
kdl-46w950a-kdl-46w954a-kdl-46w955a-kdl-46w957a-kd.pdf
Date
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Sony KDL-46W950A / KDL-46W954A / KDL-46W955A / KDL-46W957A / KDL-55W950A / KDL-55W954A / KDL-55W955A / KDL-55W957A Service Manual ▷ View online

RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
3-3-4. Main Board Power On Checking (for Main SP Lch & Rch)
No
Checking Item
OK
NG
If
 NG
If 
 NG
1
Check
Switching Freq = 384kHz or
No switching
Go to next checking.
1
Check 
IC4601 side-terminal of 
L4601,L4602,
L4603,L4604
Switching Freq   384kHz or 
768KHz ±20KHz
Vrms = dont care
No switching 
frequency at 
either one of the 
CL
Go to next checking.
2
Check F4601 MainSP
(for BA2 and BM board 
only)
V(before fuse) = 12.5V ± 0.5V
V(after fuse) = 12.5V ± 0.5 V
No voltage.
Check fuse broken?
Check CN9101 Pin 8 
&10 got 12.5V?
Change fuse (5A).
Check power supply 
board audio VCC.
3
Check F4601 MainSP
(for BKE and BKX 
V(before fuse) = 19.5V ± 0.5V
V(after fuse) = 19.5V ± 0.5 V
No voltage.
Change fuse (5A).
Check power supply 
(
board only)
(
)
p
pp y
board audio VCC.
4
Check IC4601     (Pin 
8) and C4601 (Pin 27) 
(for BKE and BKX 
board only)
V(before fuse) = 3.3V ± 0.5V
V(after fuse) = 3.3V ± 0.5 V
No voltage.
Check +3.3V_MAIN 
supply.
Note:
Size
B*
Board 
Type
G*
Board 
Type
46”
BM
G3A
85
Note: 
(AYU2) – IC9000
(Brownie)- IC9001
46
BM
G3A
55”
BM
G3B
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
Troubleshooting Reference 
BA2 board Side A (Not applicable for this model)
(
pp
)
L4602
L4601
L4603
L4604
86
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
Troubleshooting Reference 
BA2 board Side A (Not applicable for this model)
BA2 board Side A (Not applicable for this model)
CN9101
Pi
n
Pi
n
 8 
n 10 
87
RB1G
CHASSIS
W950A/ W954A/ W955A/ W957A
Troubleshooting
Troubleshooting Reference 
BA2 board Side B (Not applicable for this model)
(
pp
)
F4601
88
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