Apex 24' TV- will not come on any more

HI Ray....unhook the plug going from the power to main board and see if you get backlights when you plug the set in, if you do chances are you have a bad replacement main

It sounds like the power board is failing. If you have a meter you can check the 120 a/c voltage to the board then turn on tv even if you don't see or hear anything check to see if any a/c voltage come out of the main transformer don't know the required voltage from transformer

YOU NEED TO CHANGE THE INPUT OF YOUR TELEVISION SET TO THE CORRECT SOURCE. FOR EXAMPLE: HDMI1, AUDIO VIDEO IN, YPBR INPUT ETC, YOU CAN DO THIS BY THE USE OF YOUR TV REMOTE.

You have a shorted main board, it will need to be repaired.

The DT250 likely has one or more bad 470uf 25v capacitors. You should replace all four. Look at some of these youtube videos for how do do the replacement.

http://www.youtube.com/watch?v=on_2CP52cW4
http://www.youtube.com/watch?v=YCSNWi3UHf4&NR=1

Order 4 new 470uf 25v capacitors from digikey.com P/N P10274-ND

Use first class mail as your shipping method. Will be under 10 dollars total.

press the function key and the mute key at the same time :)

You don't need the whole manual for the Philips Magnavox remote fortunately.

If you want to reprogram it for the Apex TV, follow my directions exactly.

1. Hold down the Code Search button (on the remote) until the light on it turns red and stays red.
2. Let go of the Code Search button.
3. Make sure to switch modes at this point to which device you want to program, I'm going to assume TV Mode since your post says "Apex TV." If you need help with Apex DVD codes, I can answer that one too :)
4. As you Press the mode button and release it, the light should blink for a bit, so keep your eye on it because after it's done blinking it'll stay red.
5. At this point the remote want's you to press a sequence of numbers also known as Code[s] or Code Entries. Either way these are what are in a table inside the manual that you lost.
6. I'm going to give you two codes in case one doesn't work: 044 and 335 (one of those hopefully will work)
7. If the code worked you'll know right away because the light will get mad and start blinking again, otherwise if it DID work, it'll just turn off (the light will anyway).
8. That's it, I reccomend you test out your remote with the TV now and make it everything works. If something doesn't, try the other code. If it still doesn't work right, I'll give you some more codes.

Hope that helped,
-Cheers-

Direct Philips Magnavox Universal Remote Code Entry PM335
1. Press and hold the Code Search button until the red
indicator stays on. Release the Code Search button.
2. Press and release the desired mode button (TV,
DVD, etc.).
The red indicator blinks, then stays lit.
3. Enter the 3 digit code from the code tables. Note:
after a valid code entry, the red indicator turns off.
For an invalid code, the red indicator flashes.
4. With your device on, press CHANNEL Up. If the
device responds, no further programming is
required. Note: If some buttons do not operate your
equipment, try one of the other codes for your
brand.
APEX 044

Go to www.urc.philips.com/
Follow the steps..its easy. It will ask for the model of your remote which you will find where your batteries are located..The code I used for my APEX tv was 0023.. to load the code first hold the setup button until the red light stays on..then press tv or whatever mode you are setting up..then enter the code and if the red light goes off it is the right code and you should then press channel up to see if it works...If this code doesn't work the site above offers other codes.. Hope this helps!!

Turn the TV ON. You can use the code search option by pressing Code until the LED flashes. Press the Power button until the TV turns off. Then press Enter.

just throw it out and never buy a sony again. Sony really went down hill