LG 32LG40 Training Manual page 27

32” class lcd hdtv w/ built-in dvd player

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Power Supply PWB Test (2) Checking the Backlights

+5V

Ballast will not run if either of the Backlight plugs are removed.

P2 Connector disconnected from the Main PWB

AC: Not applied when adding jumper. Applied when make test.

If the 1

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 PWB 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.

LCD DV

32LG40