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BACKLIGHTS
„
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board to Power Supply. (CNM803)
-
√
TV Screen for active backlight LEDs.
2.
If NO BACKLIGHTS
√
Minus (Control) & Plus pins (Supply) on the Panel Connector voltages to the Panel.
If no pin voltages replace SMPS.
-
3.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
√
The Supply Drive
+
If a
pin measures higher voltage, a string(s) of LEDs are likely open.
-
Remove Panel connector and verify same open backlight voltage condition.
-
4.
If a
+
pin measures low voltage disconnect connector to panel
√
The Low Plus Pin Voltage again.
If it stays low the
-
For BACKLIGHT DIMMING PROBLEMS:
•
Go to
Menu > Picture > Backlight and vary level (0 – 20)
•
If no backlight changes observed:
√
Panel Connector pin voltages and BLU_PWM voltages (CNL802) while changing backlight level.
•
If Panel voltages don't change, and BLU_PWM changes, replace
•
If BLU_PWM doesn't change replace
:
+
pins. All should measure same.
SMPS is defective, if it goes high, defective Panel.
Main/T-CON Board.
Replace Panel.
SMPS.
4. Troubleshooting
4-5
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