No picture but have sound

1. Unplug the TV overnight and then plug it back in and SOMETIMES it could work and fix your issue.
2. Unplug the TV and everything hooked to it, and then plugging it back in may clear the problem.
3. Make sure that the TV is set to the correct input.
4. If the TV screen still remains dark unplug your TV and push the power button for about one minute and then plug it back in. See if that resets your TV. If it still remains dark use a flashlight and angle it against the screen with the TV at a station where you can hear the sound See if you can make out shadows or shapes

The inverter supplies the voltage to activate the screen. There are usually 2 boards, a slave and a main board. Sounds like one of them is leaking voltage and causing the screen to go dark after the initial start up. Make sure you didn't joggle something loose while you were replacing the power board check all connections. GL

Could be the ballast boards for the white light.

If it had a fixed image of some sort that might also explain it---if you reopen a new question post the brand and model number.

Visit this site for more details. Type in the site name "Electro-help" either Google or Yahoo search box [not in the address bar of your browser], and click search. It is an electronic equipments service help site. All details you want are there. Note the position of hyphen in between words in site name, when you type it in. The site will appear as it is in web; subtitled as electronics equipments' repair help.

Pull up older posts. You can gather all details. Sometimes, click open the adverts' by the side and bottom of each post might give you more details.

there is a problem on your inverter board and the cold cathode lamp.The inverter board is the supplying high voltage supply to the cold cathode lamp.This cold cathode lamp is the illuminating the screen in which the the picture will appear once cold cathode is lit.here is a link where you can buy the parts.. Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";}

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:Good luck hope this helps you..
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Hello, it sounds like your inverter board is goin out on the set, when you change channels if you notice on almost any TV the screen goes dark and the new channel appears, it sounds like you are not getting enough power out of the inverter board to power up the backlight enough to come on. This is why the sound remains because everything else works fine and the sound is connected to the main board.

most likely the power inverter, also suspect the p/s. best to have a trained tech check it. Julio at [email protected]

Samsung HDTV will stay on when turned on the temp lamp and timer light are flashing continually. what should I do to eliminate this problem?

A blown fuse would not be intermittant.

It is possible that the back plane lamps, and or the back plane power supply is failing.

When the set is in the dark screen, shine a flashlight on the screen at an offset angle. Look carefully and see if you see the picture images. If so, this proves that the back plane lighting is having a fault condition. If there is no image at all, then there may be a fault condition with one of the drive boards for the picture processing or the screen itself.

Jerry G.