4-2-3. BACKLIGHT
• 55 inches_SMPS Board
CNM801
Main Connector (POWER)
FUSE
CNM801 (Main Connector)
1 GND 2 ANA_DIM 3 A13V_PW 4 OD ON/OFF 5 A13V_PW 6 BLU_PWM
7 A13V_PW 8 Power_On/Off 9 A13V_PW 10 GND 11 GND 12 GND
Backlight Test :
1. Activate Backlights Test : Disconnect Lead Cable from Main to Power supply CNM801.
9 TV Screen for active backlight LEDs.
2. If No Backlights
9 Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector.
• If no pin voltages replace SMPS.
3. If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
9 The Supply Drive + pins and - pins . All should measure same.
• If a Minus (-) pin measures low (near 0 volts), a string(s) of LEDs are likely open.
• Can remove Panel connector and verify same open backlight voltage condition.
9 Replace Panel.
• If a + pin measures low voltage disconnect connector to panel.
9 The + Pin Voltage again.
• If it stays low the SMPS is defective, if it goes high, defective Panel.
Backlight
4-4
4. Troubleshooting
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