Sylvania 15 inch digital/analog LCD TV HDTV. Once

most of the time you put the cable in the box, the box does everything for you , you connect the cable from the box to the tv, turn the tv, go to settings, go to channel select auto tune

YOU HAVE TO CONNECT THE ANNTENA TO THE CABLE PART OF THE TV AND GO TO MENU AND SCAN SEARCH CHANNELS IT HAS TO SCAN THE CABLE SIGNAL FOR DIGITAL AND ANALOG SIGNAL IT MAY TAKE A FEW MINS YOU WILL HAVE TO DO THIS TO GET ALL THE CHANNELS

Yes, because the TV tuner is analog and won't decode digital broadcasts. m@nt

Try it with the HDMI cable.The RCA component cable some time it don't work.

Here a way,u could test,if it the cable signal,tv Main tuner board have problem or the DVR box again.U have analog antena?Or go and a buy a digital antena.Reset ur tv to free air signal and use it for few hours,turn it off/on and see if u losing signal,require unplug,replug to get signal back.Two problems solved ur tv board or cable signal good or not?Than U know it the DVR box and have connecting problems.

Get a digital antena,analog antena not doing the job.

CNET reviews for that TV says it only has an analog tuner only. No digital tuner. Sorry.

Try an antenna if you want to get analog over the air. I have a feeling that with the way the standards are changing, you will only be able to get digital channels. After February, the analog channels won't be around.

If you are using cable tv you need an HDTV box to get high def.

Buy another TV

Make sure your refresh rate is set no more than 60HZ. Your monitor might not support refresh rates higher than that.Also try lower resolutions.
Here is a list of specs: (also try another cable)
Features/Specifications:

• Olevia LT23HVX 23-inch HDTV Compatible Widescreen LCD TV
  
  
• General Features:
• Black cabinet
• 23-inch active screen size
• 16:9 widescreen aspect ratio
• HDTV Compatible
• 1366 x 768 native resolution
• 1600:1 contrast ratio
• 8 ms response time
• 178° horizontal and vertical viewing angle
• NTSC TV system support
• 480i, 480p resolution support
• Progressive scan
• Color temperature adjustment
• Built-in 5 watt x 2 speakers
• PC resolution support up to 1024 x 768 @ 60Hz
• English/French/Spanish language
• Sleep Timer
• V-Chip parental control
• Energy Star compliant
• Remote control included
• Wall mountable
  
  
• Front Panel Features:
• IR sensor
• Power
• Menu
• Channel down
• Channel up
• Volume +
• Volume -
• Source
  
  
• Rear Panel Features:
• 15-pin VGA
• Audio in
• Headphone
• Component Y, Pb/Cb, Pr/Cr
• Composite RCA video inputs
• S-Video
• Antenna
  
  
• Power Specifications:
• 100-240V, 50/60Hz, 2.5A (max)
• 110 watts AC power consumption
  
  
• Unit Dimensions:
• 16.5 x 27.1 x 8.3-inches (H x W x D)
• Gross Weight: 23 lbs
• Net Weight: 21 lbs
  
  
• Regulatory Approvals:
• FCC
• CSA
• UL

Package Includes:

• Olevia LT23HVX 23-inch HDTV Compatible Widescreen LCD TV
• Quick Start Guide
• Manual
• Remote control w/two AA batteries
• Power cord

Additional Information:

• Notes
• Model: LT23HVX
  
• Product Requirements:
• Satellite cable or antenna
• PC with 15-pin VGA adapter
• Stereo system with component, S-Video and composite jacks
• Available power outlet
  
  
• Disclosures:
• LCD displays may have cosmetic imperfections that appear as small bright or dark spots. This is common to all LCD displays used in products by all vendor and is not specific to any vendor or brand. Below are the acceptable amounts of "dot defects" for LCD displays that we sell:
• 20-Inch to 23-Inch:
• Total Defects: 8
• Bright or Dark Dots (random): 4
• Bright or Dark Dots (2 adjacent): 2
• Bright or Dark Dots (3 adjacent): 0
• Minimum distance between defects: 15mm (bright to bright dots)
• Minimum distance between defects: 5mm (dark to dark dots)
  
  
• Disclosures:
• Consumer Notice:
• This television receiver has only an analog broadcast tuner and will require a converter box after February 17, 2009, to receive over-the-air broadcasts with an antenna because of the Nation’s transition to digital broadcasting. Analog-only TVs should continue to work as before with cable and satellite TV services, gaming consoles, VCRs, DVD players, and similar products. For more information, call the Federal Communications Commission at 1-888-225-5322 (TTY: 1-888-835-5322) or visit the Commission’s digital television website at: www.dtv.gov.