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4. Troubleshooting
SMPS / PANEL BACKLIGHT (Parallel Wired SMPS Panel Connections)
„
1.
Activate Backlights Test
Disconnect Lead Cable from Main Board to Power Supply.
-
49" / 55" :
CN9003
TV Screen for active backlight LEDs.
9
2.
If NO BACKLIGHTS
Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector.
9
•
If no pin voltages replace SMPS.
3.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
The Supply Drive
9
•
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. Replace
•
If a
+
Pin measures low voltage disconnect connector to panel.
The
+
Pin Voltage again.
9
•
If it stays low the SMPS is defective, if it goes high, defective Panel.
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 (
9
•
If minus Panel voltages don't change, and P-DIM changes, replace
•
If P-DIM doesn't change replace
MUTE
4
4-6
+
pins and - pins. All should measure same.
Main/T-CON Board.
1
9
EXIT
CN9003) while changing backlight level.
to test Panel Backlight Sections.
Panel.
SMPS.
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Table of Contents
Troubleshooting
