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„ Backlight Test :
Simplified: SMPS/PANEL BACKLIGHT TEST: (Series Wired SMPS Panel Connections)
1. Activate Backlights Test : Disconnect Lead Cable from Main to Power Supply.
Check TV Screen for active backlight LEDs.
9
2. If NO BACKLIGHTS (Series wired SMPS Panel Connections)
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 (BL Drive Supply)
9
→
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.
BACKLIGHT DIMMING PROBLEMS:
1. Go to
Menu
Picture
£
2. If no backlight changes are observed:
Panel Connector pin voltages and
9
→
If Panel voltages don't change, and BLU_PWM changes, replace SMPS.
→
If BLU_PWM doesn't change replace Main/T-Con Board.
CNL802
1
1/2+
2
1-
3
2-
4
3/4+
5
3-
6
4-
7
5/6+
8
5-
9
6-
10
7-
11
8-
12
7/8+
Backlight
and vary level (0 –20)
£
BLU_PWM
CH1 /
PWM1
CH2 /
PWM2
CH3 /
PWM1
CH4 /
PWM2
voltages CNM803 while changing backlight level.
CNM803
B_GND
1
2
N.C
3
4
B350V
5
6
N.C
7
8
GND
9
10
VAMP(B13V) 11 12
VAMP(B13V) 13 14
VAMP(B13V) 15 16
A13V(N.C)
17 18
PS_ON(N.C) 19 20
ANA_DIM
21 22
GND(Signal) 23 24 BLU_ON/PWM2
N.C
25 26 BLU_ON/PWM1
CN201
4. Troubleshooting
B_GND
N.C
B350V
N.C
GND
B13V
B13V
B13V
GND
GND
N.C
4-17
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