4-1-3. SMPS/PANEL BACKLIGHT
Series Wired SMPS Panel Connection.•
CNL802
1 1+ 2 2+
3 1+ 4 2+
5 NC 6 NC
7 1- 8 2-
9 1- 10 2-
11 IF2 12 IF1
CNM803
1 FAIL COUNT 2 ANA-DIM
3 A13V 4 CD ON_OFF
5 A13V 6 BLU_PWM
7 A13V 8 Power_ON/OFF
9 A13V 10 GND
11 GND 12 GND
13 VAMP 14 GND
15 VAMP 16 GND
17 VAMP 18 GND
CNM803
CNL802
Activate Backlights Test1. : – Disconnect Lead Cable from Main to Power Supply.
CN201
TV Screen for active backlight LEDs. 9
If 2. No BACKLIGHTS (Series Wired SMPS Panel Connection.)
Plus (+) & Minus (-) pin voltages on the Panel Connector. 9
If no pin voltages replace SMPS.•
If voltages exist but no backlight: •
The highest pin voltage ( 9 BL Drive Supply)
Remove Panel connector and measure again to compare.•
If the • voltage was high and stays the same high reading a string of Panel LEDs are open. Replace the Panel.
If the • voltage was low and remains low the SMPS is defective.
If the voltage was low and goes high a string of panel LEDs are shorted replace the • Panel.
BACK LIGHT DIMMING PROBLEMS:
Go to • Menu £ Picture £ Expert £ Backlight and vary level (0 – 20)
If no backlight changes are observed:•
Panel Connector pin voltages and 9 BLU_PWM voltages
CNM803
while changing backlight level.
If Panel voltages don’t change, and BLU_PWM changes, replace • SMPS.
If • BLU_PWM doesn’t change replace Main/T-Con Board.
To Next Page
Loading...
