Read Sony KDL-55W950B / KDL-55W955B / KDL-55W957B / KDL-65W950B / KDL-65W955B Service Manual online
RB2G
CHASSIS
W950B/ W955B/ W957B/ M25B
12
Troubleshooting
3-2-1. LED Blinking: 3x (DC Alert & Communication Error)
3-2. LED BLINKING
Size B* Board G* Board
55”
BAX
G1A
65”
BAX
G2A
Speaker
Check
Speaker Impedance
at SP Connector
Check
Audio +12.5V
at pin 18/20 of CN9101
on the B* Board
(except Adapter
(except Adapter
model)
G* Board
Check
+12.5V / +19.5V
at Power Amp side
of F4401 / F4601 on
the B* Board
F4401 / F4601,
IC4901 / IC4601
,etc
(B* Board)
IC4901 / IC4601,etc
(B* Board)
AUDIO
NG
OK
NG
OK
NG
OK
3-times blinking
Check D+1.0V at
JL9003 / JL9127 on
the B* Board
F9105,IC9103,
Etc (B* Board)
Check
+3.3V_MAIN_1
at JL9117 on
the B* Board
F9104,IC9104,
etc (B* Board)
etc (B* Board)
DC_ALERT
NG
OK
NG
OK
NG
Check
+1.8V_MAIN on
Pin 2 of IC9201
IC9201,etc
(B* Board)
Check
+5.0V_MAIN
at JL9113 / JL9112 on
the B* Board
NG
OK
IC9102 / IC9101
etc (B* Board)
TUNER Board
Change TUS/TUW
Board
OK
NG
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