Sony GN3TR - Led Blinking 4 X (Led Voltage Error and Bcm Error); Led Voltage Error; Bcm Error

XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
2-3. LED BLINKING 4X (LED VOLTAGE ERROR AND BCM ERROR)
LED VOLTAGE ERROR
28
4-times blinking
(LED Voltage)
Check “BL_LD_ERR”
at CL1038 on BMKS board
0.95V < Voltage < 1.85V ?
BMKS board
Check “+1.8V_TU”
at C464
on BMKS board
Voltage > 1.78V
Replace Tuner Module
No
Tuner Module
OK
NG
Yes
No
Replace LD board
Yes
LD board
OK
NG
Panel
+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.
Then 4x blinking with LD_ERR is occurred.
BCM ERROR
4-times blinking
(BCM Error)
Check “LD_RDY”
At CL4053
on BMKS board
BMKS board
High
Low
Replace
LD board
NG
OK
LD board
Panel