SOURCE: Samsung hdtv tv monitor no power no light
This is just a shot in the dark but it's possible that your power supply uses a full wave rectifying bridge made up of 4 diodes to convert the AC to DC. Check these diodes out to make sure they're not shorts or opens. You can use an ohm meter. They should look like a low resistance from their anode which is the + terminal to their cathode which is the - terminal and a high resistance the other way around. If your power supply has a little starter relay in it you can also check to see if the relay coil has been blown. It should look like a low value resistor. Unsolder and replace anything that doesn't pass these tests.
SOURCE: Samsung LN-T2632H won't turn on.
Follow these steps to figure out what problem is.
When you turn on TV, look at the back and see if the back light on. If it is on, the power supply and inverter work fine. The suspection now is main board and T-con board (the small board on the middle-top of the panel)
To find the problem from the main board or not. Look at the power supply and measure Vs on - turn on the TV, this approx 5 vlt DC needs constant once you turn on the TV. If it is drop or unstable - main board problem - replace it.
If Vs on is good - disconnect the T-con cable from the power sup. If power sup stop clicking - T-con need replacing. Hope it help.
SOURCE: Magnavox 19MF337B/27 LCD TV problems
The bad capacitors in this set are usually NOT on the power supply--they are on the other (logic) board. You will find several bulging capacitors there. Replace em all....
SOURCE: I have the same problem described above. I
Capacitors are only one problems,viewing capacitors inspections are best and easiest ways.U want to test it with a multi Voltmeter look for capacitors Microferet and voltges each one,just test it.U have no skills or trouble shooting experience in electronics devices.Well no amount testing of capacitors,will not solved the tv problems,could be any things in the power supply board is slicely variable voltages could cause power problems.Try website like Ebay.com to buy a whole refurbish power supply board for the replacement.
SOURCE: my samsung 46 inch LCD
Samsung has had a lot of capacitor issues with some models, even if the capacitors look good they can still be open and need to be tested with special equipment to get to the root of the problem. They had so many issues that they decided to foot the bill in some of the models, you can contact them at 1 800 Samsung to see if your set qualifies, and at the very least they will give you the nearest service center in your area that is authorized.
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