Bad capacitor
SOURCE: Samsung 40" Full HD LCD
Resetting the TV
If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:
NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time. 
1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.
hope this may help;
Regards,
VOTIT
DON'T FORGET TO RATE:
SOURCE: sony bravia 40" hd lcd gets picture but no sound from cable box
You will have to go into the settings of the hd box by pressing the settings button twice and then scroll down to "audio digital out". chances are that it is set to Dolby Digital. If you right arrow over you can then set it to HDMI. this should bring your volume back. Hope this helps.
SOURCE: HOW TO CONNECT SAMSUNG 40 LCD TV TO SAMSUNG
you will need the following = HDMI LEAD
Optical Audio Lead
Red and White phono Lead
Sky HD Box > connect to Tv via HDMI Lead.
Sky HD box > Connect the optical Audio, and the Phono Leads To your Surrounds sound.
The reason I am wanting you to connect the phono's as well as the optical audio out. Not all programs are transmitted with Dolby D so you will need these for normal sound to come through your surround sound.
One last thing I would like you to check is the sound settings on your Hd box.
OLD PROGRAM GUIDE:
On your sky remote. Press SERVICES, 4, 2, then ensure that Dolby D is displayed if not highlight and using the blue button change this to Dolby D. then arrow down to save.
NEW PROGRAM GUIDE:
On your sky remote. Press SERVICES, 0, Arrow along to SOUND then arrow down and change this to DOLBY D Then press the GREEN button.
Hope this Helps you out. IF so please leave a thumbs up
Little Dish Fitter
SOURCE: i have a sony 40 inches bravia flat screen hd and
Could be the decoder:
1. unplug the TV ans wait a few mins.
2. If you have digital cable box or dish tuner reboot those as well (likely your issue)
What you have is artifacting what that means is tiling garbiling and freezing this happends when the data in the digital stream just stopped hence Frozen.
Try those things rule out your cable tv box first or your sat box, if this is OTA over the air your antenna.
1. Try DVD's if it happends during a DVD you do have a decoder issue if it does not you need to talk to your cable tv or sat operator.
So you got 3 possiabilites here 1. the worse Decoder, 2 cable company or satalite provider, 3 your antenna is in the wroung position.
I sure this will help.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620
Testimonial: "i just hope this works"
SOURCE: wondering if 40 inch 1080 LCD element was a good buy?
Not a great brand, generally when out of warranty, you are on your own. No repair except by independant shops if they will even touch it - no manuals or parts that they can get... Considered a disposable set.
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thank you you answered me via a utube which showed that the problem was bad capacitors and how to fix with soldering etc. way out of my league.. but now i knew the problem and was able to contact a repairman to whom i described the problem and solution and he fixed it at some cost of course
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