Remove back from ln32a450c1d - Samsung LE40R74BDX 40 in. LCD Television

Download the service manual from here:
http://elektrotanya.com/viewsonic_vt2430-1m_vs12335-1m.pdf/download.html

Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.

To remove back leg: pull off round end caps where leg connects to back (pressure fit). Then remove black stickers covering screw holes at base of leg. Under stickers are 4 screws - remove and lift off leg assembly.

Remove back cover: remove 7 black screws from back (one hiding under warranty sticker). Lift back from bottom edge (pressure connections on top edge). Back cover will catch on cd/dvd tray door - bend slightly to get around.

Under back cover is metal cover. Remove screws from around edge holding back cover on (note that most screws you will see in pairs - only remove the one holding the metal cover, not the one holding the chassis). Lift off metal cover.

You should now see hdd. One screw holding in position - remove screw, slide out hdd (it will have a metal frame around it). HDD is a 2.5" laptop style.

Swap out hdd from its frame, then re-assemble.

If you can open your LCD and clean all connector given and refit properly.don't use force to remove connector just try to softly remove.

You need to change the resolution settings for the secondary display within Windows (control panel). Another problem could be that you need to make the laptop output video though the VGA port by using the FUNCTION key (usually somewhere on the lower left portion of the keyboard) and the EXTERNAL MONITOR key (usually one of the F* keys). The function key my be abbreviated "FN" and the ext monitor key will usually have a small picture of a monitor or something and the F* keys are F1-F12 located at the top of the keyboard. The function key needs to be held down while pushing the ext mon key. Kinda like holding down the SHIFT key to make CAPITAL LETTERS.
Sorry if I'm being too descriptive or if you already know how to do this.
As far as the resolution to use, I'd start by setting it to it's lowest possible value and then you can work your way up by trial and error. Once it starts working on the lowest (usually 800x600), select the next highest and press apply. If it's a resolution that your TV can handle, you'll continue to see a picture on it. Otherwise it will display the "No Signal" message. Just wait a few moments and the 15 second approval timer in windows will expire and it will set it back to the resolution that you had working last.
Another thing to try is rebooting your laptop (with the TV already connected to it). This might cause Windows to auto detect the required resolution required by your TV and set it by itself.
You'd think with all the super-smart gadgets and multiple versions of Windows that we have today that they would've conquered this kind of problem already. But many of us still deal with this sh*& everyday.
Maybe we should set up Mr Gates (Microsoft) and Mr Hounchooleemuhngow? (Samsung) on a date so they can work some bugs out. But that might go awry, two swollen-headed super-powers at the table....
Bill: "No, no, no, Mr. YungCheeMihn. You need to submit drivers to us for your TV's to be recognized by the Windows platform."
Samsung: "Noa! Yua buy Samsung ricense for yua windo to use ow TV!"

Found this - should help you

cosmetic screw covers that cover nothing
"remove this panel so you can remove that panel so you can slide the
carriage holder and unscrew the fenortnor rods."
"Flex the case in the middle and the undercarriage will drop out."
"Slide the front cover a couple inches left and remove screws, then
turn it around and lift the cover one inch to remove third screw."

removed screws from top / bottom and sides? then pull top pcover back slightly and lift at rar to clear back cover manouver the flex drain pipe as you remove panel ?

SEND $299.99 to me add i'll tell you.