LCD DV August 2008 32LG40
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Power Supply Board Test (2) Checking the Backlights
Power Supply Board Test (2) Checking the Backlights
If the 1
st
test was successful, continue. Leave original 10K in place.
2nd: To test the Backlights, leave the 10K jumper in place. Plug up the Back
light plug P203. Apply AC Power.
Observe the Backlights.
If normal, LED1 on the Ballast Board should turn on first, then backlights
should turn on and LED1 should go off..
If no backlight activity, confirm the Fuse F101 has approx. 350V on both sides.
If on one side, check fuse for open.
If no 350V, replace Power Supply.
If 300V present, check P203 for 24V on Pins 1~5.
Check P203 Pin 12 for at least 3V (Inverter On/Off).
If yes, confirm Connectors to backlight OK, if OK, then panel defective.
+5V
P2 Connector disconnected from the Main Board
AC: Not applied when adding jumper. Applied when make test.
Ballast will not run if either of the Backlight plugs are removed.
