Samsung UN NU710DF Series - Page 58

CNL801 (LED Connector) - 40/43/50/55/58/65 inches
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7 4+ 8 4- 9 N.C 10 N.C 11 N.C 12 N.C
CNL801 (LED Connector) - 75 inches
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Activate Backlights Test 1. : Disconnect Lead Cable from Main to Power Supply.
TV Screen for active backlight LEDs. 9
If No BACKLIGHTS2.
Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector. ( 9 with ne test probe on left side of
connector only for safety)
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.•
Replace Panel• .
If a• (+) pin measures low voltage and it’s minus pin is low but not 0V.
Check for Defective • SMPS
BACKLIGHT DIMMING PROBLEMS
Go to • Menu £ Picture £ Expert Settings £ Backlight and vary level (0 – 50)
If no backlight changes observed:•
Panel Connector 9
CNL801
minus (-) pin voltages and PWM_BLU voltages
CNM801
while changing backlight
level.
If • minus (-) pin voltages don’t change, and PWM_BLU changes, replace SMPS.
If • PWM_BLU doesn’t change replace Main/T-Con Board.
Use: MUTE £ 4 £ 1 £ 9 £ EXIT to test Panel Vertical Backlight Sections in normal operation mode.
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4. Troubleshooting