Samsung HG43NT678UF Service Manual page 58

If BACKLIGHTS on but
3
PANEL SECTION(S) off ?
Locate CH1 (+) on SMPS and measure for approx. 270Vdc (65")
9
Locate CH1 (-) on SMPS and measure for approx. 270Vdc (65")
9
If CH1 (+) is very low or
missing ?
Replace SMPS Board
9
4. Troubleshooting
If CH1 (+) is OK & CH1 (-)
near 0 Volts ?
Replace Panel
9
is
4-11