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24
Troubleshooting
3-2-4. LED BLINKING 5x (Panel Communication Error) – a) 12.5V NG
Note: Board Details refer Section 3
main page.
5-times blinking
Check
PANEL_VCC 12.5V at
CN8400
on the B* Board
Replace the Harness
Between G* /LD board
and B board
Replace
the LVDS Harness
Change
B* Board
Change
Panel (T-con)
Harness
LVDS Harness
B*Board
NG
OK
NG
Symptom
improvement
Symptom
improve
Symptom
improve
NG
NG
G* Board/LD
Check 12.5V
G*/LD Board
XM-A/DT :
*3-1-1 No Power
– LD Board
NG
OK
Refer I2C Error
Checking in next slide
25
Troubleshooting
5-times blinking
PANEL ID Check
Check I2C (Data & CLK)
At CL
XM-H/A/DT (BMX):
CL8411 &
CL8412
INIT_DONE
Check I2C (Data & CLK)
At CL
I2C Communication
Check I2C (Data & CLK)
At CL
I2C Error
Change B-Board
B-Board NG
Change FFC
FFC NG
Change FRC
FRC NG
OK
OK
OK
NG
NG
OK
OK
NG
NG
NG
3-2-4. LED BLINKING 5x (Panel Communication Error) – b) 12C Error
26
Troubleshooting
BMX Probing Points – I2C Line Check
BMX (A-Side)
CL8412
(I2C_S_CLOCK)
CL8411
(I2C_S_DATA)
27
Troubleshooting
3-2-5. LED BLINKING 6x (Backlight Error)
No
Harness /
Connection
broken
6-times blinking
Check
**JL9008
BL_ERR_DET
on B*Board
Check
harness/connection
G*board to B*Board
or
LD board to B*Board
G*Board
or LD?
Voltage ≥ 1.9 V
Symptom
Improvement
Harness
Change
harness
Change
B* board
B* Board
Harness /
Connection OK
No
improvement
PSU OK
Voltage < 1.8 V
**BMX: JL9008 BL_ERR_DET
Panel
Change
Panel
Symptom
Improvement
Visual Check LS Bar
FFC Conductive Copper
Peel Off?
Refer to 1.5
Out1 & Out2 Check (LED_Output)
LD
G* Board
Yes
Suspect LS
Bar Broken
No
Improveme
nt
Symptom
Improvement
Click on the first or last page to see other KDL-43W755C / KDL-43W756C / KDL-43W800C / KDL-43W805C / KDL-43W807C / KDL-43W808C / KDL-43W809C / KDL-50W755C / KDL-50W756C / KDL-50W800C / KDL-50W805C / KDL-50W807C / KDL-50W808C / KDL-50W809C / KDL-55W755C / KDL-55W756C / KDL-55W800C / KDL-55W805C / KDL service manuals if exist.