Having problems with your Flat Panel Televisions ?

We had a power surge other evening due to lightning storm. Samsung LCD TV was on surge protector and everything else on surge protector is fine. But red light comes on on TV when plugged in but no response from remote, no picture, no sound, nothing. Checked capacitors and no bulging or leaking from hem. Help please. TV only 14 months old.



Answers :

The first thing (after unplugging the set) to check is whether you have a shorted diode in the main power section of the power supply. Test each diode with an ohmmeter to verify it conducts in only one direction. I assume from the red light that Standby power is working, but it may be out of specification. If the main power supply has a separate fuse from the standby power, check that fuse. If it is blown, check the main rectifier and regulator chip/transistor for shorts (Note: a short is the opposite of an open. A blown fuse is open. A shorted diode or transistor looks like a wire on an ohmmeter test. It's called a short because current can take a shortcut through it, like when you touch the ohmmeter leads together instead of connecting them to a device.)

If you don't find anything obvious with the ohmmeter test, you'll need to do a live check of the power supply with an oscilloscope. First, verify that the 5 V standby power is clean and at 5 Volts +/-5%. Next, watch for a start-up command on the Power On terminal when you press the Power button. If you get this, check the Power Good terminal to make sure it changes and stays at its new voltage when you turn on the set. Verify the voltage outputs are within 5% of nominal level and are clean.

If you do not see the turn-on signal to the power supply, you have damage to the main board. If you see the turn-on signal briefly, but no Power Good indication, there is most likely something wrong with the main power supply (you probably already knew this from the output verification in the preceding paragraph).

In any case, this may qualify for homeowners or renters insurance compensation. Check with your agent. Some makers of surge protectors will pay up to $5000 for repair of equipment protected by their products if they are damaged by surges - check on that first since there will be no deductible.
Hi,
IF you want to DIY the repair of your TV you should first know how to use a multimeter..specially voltage reading and resistance reading...
We have to find out first if the voltage output of the power supply of your TV is complete.There are 3 voltages on the power supply output section..they are as follows.

1) 5 volts---this voltage is the supply of the main boards CPU without this voltage the system will be dead.
2) 12 v --this is for the audio amplifier section the sound of the TV.

3) 24 V --This voltage is for the supply input of the inverter board.inverter board is a board that gives a supply voltage to the back light lamp.the input voltage of the inverter board is 24 volts and convert it into a high voltage volts enough to light up the screen of the display monitor.

There is a fuse that on the power board check them with your tester if the fuses are bad or good and replace it ..
check the power supply first and post back for the findings you have...good luck!

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