Samsung UN55MU850DF, Руководство по обслуживанию

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SMPS / PANEL BACKLIGHT (Parallel Wired SMPS Panel Connections)
„
Activate Backlights Test 1.
Disconnect Lead Cable from Main Board to Power Supply.
-
55" : CN9003 65" : CMN803
TV Screen for active backlight LEDs.
9
If NO BACKLIGHTS 2.
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) OFF 3.
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
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+ Pin Voltage again.
If it stays low the SMPS is defective, if it goes high, defective Panel. •
For BACKLIGHT DIMMING PROBLEMS:
Go to • Menu
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Picture
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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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4. Troubleshooting