Sony X900E Series Service Manual page 27

FLOW
2-2. LED BLINKING 3X (DC ALERT AND AUDIO ERROR)
DC_ALERT
3-times blinking
(DC Alert)
Check "POWER_MAIN"
at pin 17/19 of CN400
OK
on B* board,
Voltage = 18.0～20.0V or
22.5～24.5V ?
NG
G board
JK board
AC Adaptor
XBR-49/55/65/75X900E,905E,907E
Check "+5.0V_VBUS"
OK
at C431 on B* board
4.959V<Voltage<5.285V?
NG
BMKS / BMKP board
AUDIO ERROR
3-times blinking
(Audio Error)
Power Off Check
Go to No Sound (Power Off Check)
Other flows
Power On Check
Go to No Sound (Power On Check)
Replace
G board or JK board
or AC Adaptor
NG
Measure the Speaker
impedance by multi-meter
Less than 3Ω ?
No
Speaker Harness
TROUBLE SHOOTING
OK
G or JK board
or AC Adaptor
Yes
Replace
Speaker
27