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