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4. Troubleshooting
4-2-3. BACKLIGHT
•
55 inches_SMPS Board
Main Connector (POWER)
1
GND
2
7
A13V_PW
8
Power_On/Off
Backlight Test :
1. Activate Backlights Test : Disconnect Lead Cable from Main to Power supply CNM801.
TV Screen for active backlight LEDs.
9
2. If No Backlights
Minus (Control) pins & Plus (Supply) pins voltages on the Panel Connector.
9
•
If no pin voltages replace SMPS.
3. If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
The Supply Drive
9
•
If a Minus (-) pin measures low (near 0 volts), a string(s) of LEDs are likely open.
•
Can remove Panel connector and verify same open backlight voltage condition.
9 Replace Panel.
•
If a
+
pin measures low voltage disconnect connector to panel.
9 The
+
Pin Voltage again.
•
If it stays low the SMPS is defective, if it goes high, defective Panel.
4-4
CNM801
FUSE
CNM801 (Main Connector)
ANA_DIM
3
A13V_PW
9
A13V_PW
+
pins and - pins . All should measure same.
4
OD ON/OFF
10
GND
11
5
A13V_PW
6
GND
12
Backlight
BLU_PWM
GND
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