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BACKLIGHTS
„
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board to Power Supply.
-
TV Screen for active backlight LEDs.
9
2.
If NO BACKLIGHTS
Minus (Control) & Plus pins (Supply) on the Panel Connector voltages to the Panel.
9
If no pin voltages replace SMPS.
-
3.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
The Supply Drive
9
+
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.
9
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 minus (-) pin voltages and P-DIM voltages (CNL801) while changing backlight level.
9
•
If minus Panel voltages don't change, and P-DIM changes, replace
•
If P-DIM doesn't change replace
MUTE
4
1
:
+
pins. All should measure same.
SMPS is defective, if it goes high, defective Panel.
Main/T-CON Board.
9
EXIT
to test Panel Backlight Sections.
Replace Panel.
SMPS.
4. Troubleshooting
4-7
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