Samsung UE49KS9000T, Руководство по обслуживанию

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BACKLIGHTS
„
Activate Backlights Test 1. :
Disconnect Lead Cable from Main Board to Power Supply.
-
TV Screen for active backlight LEDs. √
If NO BACKLIGHTS 2.
Minus (Control) & Plus pins (Supply) on the Panel Connector voltages to the Panel. √
If no pin voltages replace SMPS.
-
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF 3.
The Supply Drive
√
+
pins. All should measure same.
If a
-
+
pin measures higher voltage, a string(s) of LEDs are likely open.
Remove Panel connector and verify same open backlight voltage condition.
-
Replace Panel
.
If a 4. + pin measures low voltage disconnect connector to panel
The Low Plus 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 (CNL801) 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.
4-6
4. Troubleshooting