4-1-4. Additional Option Backlight Test
49 / 55 / 65 / 75 / 82 inches
•
Activate Backlights Test
1.
: Disconnect Lead Cable from Main to Power Supply.
TV Screen for active backlight LEDs.
9
Locate LED 1 through LED 6 Diodes on SMPS
2.
Check each stripe side of Diode for approx
9
130Vdc
(LED Drive)
Check other side of Diode for approx
9
50Vdc
(LED Control)
If any have low or missing 130V LED Drive
•
check SMPS
.
If any have near 0V LED Control and 130V LED Drive is OK, Replace
•
defective Panel
Reconnect SMPS to Main/T-Con to Operate TV Normally
3.
Adjust backlights in Picture Test between 0 to 50 range
-
Locate LED 1 through LED 6 Diodes on SMPS
4.
Check LED Control - non strip side of each Diode.
9
Check that each vary from approx 70 Volts when at 0 setting to approximately 55 Vdc at 50 setting.
9
If it doesn’t change, check
•
ANA-DIM
changes (0.2Vdc to 0.7Vdc) on
CNL801
.
If
•
ANA-DIM
changes replace
SMPS
It
•
ANA-DIM
doesn’t change replace
Main/T-Con Board
4-13
4. Troubleshooting