Samsung PS43D490A1XZN Service Manual page 23

CAUTION
Make sure to disconnect the power before working on the SMPS board.
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Che ck the LED ope ra tion of Logic Boa rd
whitch is norma lly ope ra ting?
(Norma l : Blink once a s e cond)
Ye s
Che ck the LVDS conne ctor.
Is it conne cte d corre ctly?
Ye s
Che ck All output volta ge s on S MP S .
Are a ll volta ge s norma l?
Ye s
Re place the Main Boa rd.
Check the LED
Operation.
No
Re place the Logic Boa rd.
No
Che ck / Re pla ce the LVDS Ca ble .
No
4. Troubleshooting
Re place the S MP S .
4-5