Led Blinking 4X (Led Voltage Error And Bcm Error); Led Voltage Error; Bcm Error - Sony X900E Series Service Manual

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2-3. LED BLINKING 4X (LED VOLTAGE ERROR AND BCM ERROR)

LED VOLTAGE ERROR

4-times blinking
(LED Voltage)
Check "+1.8V_TU"
Yes
at C464
on BMKS board
Voltage > 1.78V
No
NG
Replace Tuner Module
OK
+1.8V_TU is used in tuner module and 4KPQ.
If +1.8V_TU for 4KPQ is dropped, it can't output signal for LD.
Tuner Module
Then 4x blinking with LD_ERR is occurred.

BCM ERROR

4-times blinking
(BCM Error)
Check "LD_RDY"
Low
At CL4053
on BMKS board
High
BMKS board
XBR-49/55/65/75X900E
Check "BL_LD_ERR"
Yes
at CL1038 on BMKS board
0.95V < Voltage < 1.85V ?
No
BMKS board
NG
Replace
Panel
LD board
OK
LD board
NG
Replace LD board Panel
OK
LD board
TROUBLE SHOOTING
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