Led Blinking: 3X (Dc Alert & Communication Error) - Sony KDL-43W7 C Series Service Manual

Troubleshooting
3-2-2. LED Blinking: 3x (DC Alert & Communication Error)
3-time blinking
Check +5.0V_MAIN
at L9015, 4.959V
<Voltage<5.285V?
OK
DC_ALERT
NG
F9013, IC9021,
etc (B* Board)
AUDIO
Check
Speaker Impedance NG
Speaker
at SP Connector,
8Ω±1.2Ω ?
OK
Check Audio
NG
+19.5V
LD* Board
at pin 16/18 of CN9000
on the B* Board
OK
Check +19.5V
NG
at Power Amp side F7751, IC7751
, etc (B* Board)
of F7751 on
the B* Board
OK
IC7751, etc
(B* Board)
Note: Board Details refer Section 3
main page.
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