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4. Troubleshooting
„
BACKLIGHTS
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board to Power Supply.
-
√
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
pin measures higher voltage, a string(s) of LEDs are likely open.
-
If a
+
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:
•
Menu £ Picture £ Backlight and vary level (0 – 20)
Go to
•
If no backlight changes observed:
√
Panel Connector minus (-) pin voltages and P-DIM voltages (CNL801) while changing backlight level.
•
If minus Panel voltages don't change, and P-DIM changes, replace
•
If P-DIM doesn't change replace
MUTE
4
1
4-6
:
pins. All should measure same.
+
SMPS is defective, if it goes high, defective Panel.
Main/T-CON Board.
to test Panel Backlight Sections.
9
EXIT
Replace Panel.
SMPS.
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