No Picture and No sound for 20 to 30 minutes.. At first it was five minutes then 10-15 minutes and today 30 minutes or more before the sound and picture come on.. Once sound and picture come on everything looks and works normally.

Hi, this could be a problem with the power supply in the tv, it is common especially on some Samsungs and specific repair kits are available quite cheaply if you have good soldering skills, this can also apply to many other Flat Screen TV's .

Usually this is caused by capacitors that have dried up and split, you can normally tell as the capacitors are bulging on the pcb, you can get them in a kit as I said eBayer's sometimes do them or you can buy them indivually from a good electronics components supplier, make sure you get the correct values for each!! marked on the side of the capacitors in xx/x V, xxx/x uF and 105oC. (the x's represent numbers)

The picture below shows the type of theing that happens, the brown ones are bulging/split on the top whereas the black one is fine.



High Voltages can exist in these sets, never attempt anything while plugged in and
if in doubt do not attempt it yourself and seek the advice of a qualified TV Technician.

There could also be dry solder joints on the panel, usually applies to the power supply as it's mainly these get the hottest.

Here's an example of what dry joints look like.....


High Voltages can exist in these sets, never attempt anything while plugged in and
if in doubt do not attempt it yourself and seek the advice of a qualified TV Technician.


It's also worth considering claiming under the warranty for replacement or repair through you dealer if warranty is valid.

Hope this helps (: don't forget the thumbs up if it did :)
Midge.