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4-1-3. SMPS/PANEL BACKLIGHT
•
Series Wired SMPS Panel Connection.
CNM803
1.
Activate Backlights Test
TV Screen for active backlight LEDs.
9
2.
If
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
•
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
•
If the voltage was low and goes high a string of panel LEDs are shorted replace the
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
•
If Panel voltages don't change, and BLU_PWM changes, replace
•
If
BLU_PWM
1
CNL802
3
5
7
9
11
13
15
17
: – Disconnect Lead Cable from Main to Power Supply. CN201
BL Drive Supply)
BLU_PWM
doesn't change replace Main/T-Con Board.
CNM803
FAIL COUNT
2
ANA-DIM
A13V
4
CD ON_OFF
A13V
6
BLU_PWM
A13V
8
Power_ON/OFF
A13V
10
GND
12
VAMP
14
VAMP
16
VAMP
18
SMPS
is defective.
voltages CNM803 while changing backlight level.
SMPS.
CNL802
1
1+
3
1+
5
NC
7
1-
9
1-
GND
11
IF2
GND
GND
GND
GND
Panel.
4. Troubleshooting
2
2+
4
2+
6
NC
8
2-
10
2-
12
IF1
4-3
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