SMPS / PANEL BACKLIGHT (Parallel Wired SMPS Panel Connections)
Activate Backlights Test1.
Disconnect Lead Cable from Main Board to Power Supply. -
55" : CN9003 65" : CMN803
TV Screen for active backlight LEDs. 9
If NO BACKLIGHTS2.
Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector. 9
If no pin voltages replace SMPS.•
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF3.
The Supply Drive 9 + 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. Replace • Panel.
If a • + Pin measures low voltage disconnect connector to panel.
The 9 + Pin Voltage again.
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 CN9003) while changing backlight level.
If minus Panel voltages don’t change, and P-DIM changes, replace • SMPS.
If P-DIM doesn’t change replace • Main/T-CON Board.
MUTE 4 1 9 EXIT to test Panel Backlight Sections.
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