Sony A1E Series Service Manual page 25

FLOW
2-2. LED BLINKING 3X (DC ALERT AND AUDIO ERROR)
DC_ALERT
3-time blinking
(DC Alert)
Check "POWER_MAIN"
at pin 8/9/10 of CN401
on B* board,
Voltage = 18.0~20.0V
NG
G* board
XBR-55/65A1E
Check "+5.0V_VBUS"
OK
at C431 on BKA board
4.959V<Voltage<5.285V?
NG
BKA board
OK
Retry
AUDIO ERROR
LED 3x blinking
(Audio Error)
Power Off Check
Go to
NO SOUND (POWER OFF CHECK)
Power On Check
Go to
NO SOUND (POWER ON CHECK)
OK
Replace
DKA board
NG
OK
Replace
BKA board
NG
Replace
OK
Speaker Harness
(Main Harness)
NG
Measure the SWF
Yes
impedance by multi-meter
Less than 3Ω ?
NO
Replace
Panel module
TROUBLE SHOOTING
DKA board
BKA board
Harness
Replace
SWF
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