Dynnex lcd37 tv display problem ?

UNPOWERED INPUT DEVICE

Check to make sure the device you're trying to use with your TV is plugged in and turned on. While it may seem like a silly oversight, it is possible that you switched on your TV and didn't actually turn on your DVD player, gaming console or whatever device you're trying to enjoy. If you tried to use a remote to turn on the device, check that the batteries still have a charge and turn on the device using its built-in power button.
TIP The problem may be your input device itself. Check your TV with other devices and see if it displays them properly. If it does, contact customer support for your device for more detailed troubleshooting instructions

WRONG INPUT CHANNEL

Make sure that your TV is on the right input channel for the device you're trying to use. When your TV isn't switched to the right channel, no visual or audio input from the device will display on your screen or through your speakers. Turn on the input device and press the Input button on your remote to cycle through your input channels until you see the device's display on your screen.

AV CONNECTION PROBLEMS

If you're on the right input channel and your device is turned on, there may be a problem with the physical connection between the device and your TV. Make sure that all cable connections are secure, and also that all cables are connected to the In ports on your TV and the Out ports on your input device. If you're using a connection that has color-coded plugs, make sure the connectors are inserted into their appropriate color-coded ports.
If you're using an HDMI connection, make sure that the cable you're using is compliant with High-bandwidth Digital Content Protection, especially if your TV and input device are both HDCP-enabled. HDCP is a copy protection system that prevents the copying of digital video and audio content as it travels over the connection. Systems connected with non-compliant cables won't display any video or audio conten

FROZEN TV

Periodically a TV may freeze up, showing that it's still turned on but not actually displaying any information from your input device or the TV's menu system. To fix a freeze, power cycling is the best solution. TEP 1 Turn off the TV by pressing and holding the Power button on the cabinet until the TV powers down.
STEP 2 Unplug the TV from the wall power outlet.
STEP 3 Press and hold the Power button on the cabinet for 30 seconds, and then release it.
STEP 4 Plug the TV back in and turn it back on using the Power button on the cabinet or your remote control.

HARDWARE OR SOFTWARE FAULT

If everything is correctly set up, powered on and on the right channel and you still aren't getting any picture or sound, there may be a hardware or software fault in your TV. The best way to check is to press the menu button on your TV or remote and see if the on-screen menu appears. If the menu doesn't appear, contact repair

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It sounds that the main digital board to this TV is faulty. Contact any service technician.

Most likely you have a fault in the back light circuit. To verify this, turn on the set, when the screen goes black, take a bright flashlight and shine it on the screen. It may be easier to dim the lights in the room so that you can see the faint image on the screen. If you see the faint image, you indeed have a back light problem. You will need to get a diagnoses performed on the set to track down the problem

Change input device to some other which you know works for sure. If problem persists, try changing the channel. If you notice same problem, this may need attention by a qualified service technician.

On the dvd player and on your tv, you should have 3 jacks. Yellow, for video, Red for sound, and white for sound. Just match the colors. Then on your tv, change the channel to AV or Input

Had a very similar problem with mine - not sure if this will help or not, but it seems to be doing the trick (channels scanning as I type).
I unplugged the tv for about an hour. I unplugged the cable, and all the components. Then I turned the tv on, and was able to get to the menu screen. Previously, I couldn't change channels or even power off from the buttons on the side of the unit either...
Once there, I plugged the coaxial cable directly into the side of the set, then ran the auto-scan.
I know it's not a techincal answer, and a bit strange, but as I mentioned, it seems to be working for my issue.

Good luck!

sounds like the sceen is dead, if you are receiving nothing on screen, then it sounds like either a component and/or screen is gone... however, check the tv input to make sure it wasnt acidentally switched to an input channel with nothing selected... if that does not work, call local tv repair or mfg customer service tech. if under warranty, have repaired or replaced. without physically seeing tv, it is hard to diagnose issue outside of information given. could be simple board replacement or could be screen.. but check input first, if a dvd player plays, then it could be just component or input on wrong selection

try use out door ant