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4. Troubleshooting
LD Board
„
65 inches
CN9001 (To SMPS)
2
GND
4
GND
6
Vdrv
8
Vdrv
10
Vdrv
12
Vdrv
14
Vdrv
16
GND
18
GND
20
GND
22
GND
CN9003 (To Main & T-CON)
1
GND
3
BLU_ON
5
SDA_LED
7
TEST_LD
9
SERIAL_STT
10
11
SERIAL_DATA
12
13
GND
14
LD Board Operation
1.
CN9005 ~ CN9014 supply voltages to the panel LED arrays.
2.
The positive (+) pins supply approximately 13Vdc (panel size dependant).
3.
The negative pins will vary between approximately 1Vdc and 3Vdc, depending on the brightness level of that section.
LD Board Troubleshooting
1.
Force on the backlights.
2.
Check the fuses (F9001S, F9002S, F9003S, F9004S, F9006S)
on either side for approximately 30 Vdc; if abnormal, suspect a defective panel, SMPS or LD.
9
3.
Check the negative pins on CN9005 ~ CN9014 for approximately 1Vdc (due to forced operation).
LD Board/Panel Troubleshooting
1.
Verify SMPS Vdrv 30 Vdc to LD Board (CN9001).
2.
Unload the LD Board by removing the cables connected to CN9005 ~ CN9014.
3.
Check the
fuses
on either side for approximately 30 Vdc (only when LD Board is UNLOADED).
If voltage is 30 Vdc on all 5 fuses
-
Panel is likely defective.
9
If voltage is low on any fuse
-
LD Board is likely defective.
9
4-8
1
GND
3
GND
5
Vdrv
7
Vdrv
9
Vdrv
11
Vdrv
13
Vdrv
15
GND
17
GND
19
B13V
21
GND
2
SCL_LED
4
TEST_SD
6
GND
8
VSYCN_IN
SERIAL_UHR
GND
CONTACT
CN9001
CN9002
<LD BOARD>
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