Well, you have to remove the back of the TV's cabinet, plug the TV in, and find the plug labled CN6401 on the power supply board. Pin 1 on that connector is usually marked by a DIFFERENT-colored wire. Then you count down to the pins listed in the previous posting -- touch the RED wire to that pin, and the black wire can be touched to anything metal like the RF tuner connector or the outside of any of the INPUT jacks (they are the TV's ground. (I suggest getting an Alligator Jumper Wire to connect the Black to the Tuner/Input jack and hold the Red test probe on the pins while you turn it on.
The TV will shut off kind of quickly, so you have to stare at the meter the moment you power it up (get a 2nd helper if needed ).
You will be looking for 12 Volts on Pin 8 and 9, and pin 5 too -- if you get it on pin 8 and 9, then the power supply is good.
If you don't get any voltage on Pin 5 -- that's your Audio 12 Volts, and it means there is a short on the Audio Amp, or it KA-THUMPED the fuse open (too much current!)
Let me see if the Picture Uploader has been fixed yet -- this should be a picture of your power supply and where those pins are on the plug.
Oh heck no...it's STILL broke.
Guess we wait for pictures unfortunately.....
Listen, you'll find 3 connectors on the power supply board -- the AC power cord is on the SAME side of the board as the connector you want to test. It also goes to the board with all the INPUT jacks on it.
And pin 1 is the one wire closest to the AC power cord -- count to pin 5, and pin 8 or 9 That's the 12 Volts you want to test.
Edited by TV Tech1 on 9/19/2010 at 4:07 PM EST