Read Sony KDL-32R420A / KDL-32R421A / KDL-32R423A / KDL-32R424A / KDL-40R470A / KDL-40R471A / KDL-40R473A / KDL-40R474A / KDL-46R470A / KDL-46R473A Service Manual online
KDL-32R420A/421A/423A/424A, 40R470A/471A/473A/474A, 46R470A/473A(AEP/UK)
23
TROUBLE SHOOTING
2) 3 times blinking (Main Board Error)
3-time blinking
Check PWM_5V at
L202 pin-2 on Main board
(4.75~5.25V)
U202, L202, etc
Change Main board
Change Speaker
Check SYS_3.3V
at U204_Pin-6
on Main Board
(3.135~3.465V)
Check the speaker
Impedance at the
SP Connector
(8ohm+/-15%)
U204, etc
Change Main board
Demo, Audio, Tuner, etc
Change Main board
DC_ALERT
NG
OK
NG
OK
AUDIO
NG
OK
Check the harness
M/B to Speaker
connection
NG
OK
Fix the harness
connection
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