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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Purchase your UHF/VHF antenna. The antenna can also be purchased at most electronic and retail stores. Consult your list from Step 1 and see how powerful the over-the-air signals are for your specific address. Purchase your antenna based on the broadcasting power you need to receive a clear picture on your TV. You might be able to get away with an indoor antenna if your signal strength is strong enough. If not, you'll need to purchase an outdoor antenna.
4 Install your antenna (or have it done professionally) according to the building codes of your area. If you must use an outdoor antenna, it is a good idea to have the antenna professionally installed. This ensures that it is properly grounded on your roof, not too close to electrical wiring and stable during inclement weather.
5 Hook the converter box up to your television using the cable that came with it (F Cable). Hook your antenna up to the converter Box. Turn on your TV and converter box. Tune your TV to channel 3 and press "Scan" on the digital convert box. Allow the box to scan for your available channels.
6 View your picture and adjust your antenna accordingly for the clearest over-the-air feed. You should only need to make adjustments once. If you are having a difficult time getting a clear picture, use a signal strength indicator to see where you receive the most powerful signal.
Check ur tv converter box a small button on the back of the converter box make sure it is not set to channel 4,make sure it set it to channel 3.Put ur tv on channel 3.Take the antena signal input put it in the converter box hole that call ANT.Take the wire that came with the converter box put the wire one side of it connected to the other hole into the converter that said OutPut.The other side of the wire should be connected to the hole in the tv said ANT hole.Now make sure ur tv converter box power a/c cord plug into the a/c power outlet and the power button is press on and have power to the converter box.The converter box now power LED light on indication should be on and it is green.Now the tv CRT screen picture should have a menu of the converter box funsctions.Just follow the on screen instructions and press the enter button on the remote and it will now auto scan for those free air Digital DTV channels.When the auto scan it reaches 100% is it done.Now u have done it.
Just Connect signal to tv and run autoprogram. Or use video input jacks from converter to tv ( yellow,white and red video in ) and select tv/video on tv pannel front ( don't need remote control) I hope this work for you.
Make sure the TV setting is set to or .
A power surge may have reset your ?cable-ready? TV. Check the cable setting on your TV and make sure it is set to or .
If a VCR is connected:
* The VCR needs to be on channel 4.
* VCR may not be ?fine-tuned? to channel 4. Locate and adjust the fine-tuning mechanism until the picture comes in clearly.
* The <3/4> switch may be in the wrong position. Locate the switch on the back of the VCR and set it to <4>.
If a converter is connected:
* Make sure the TV is on channel 4.
* TV may not be ?fine-tuned? to channel
Locate and adjust the fine-tuning mechanism until the picture comes in clearly.
* Determine if the converter is bad. Locate the cable wire coming in to the room and connect it directly to the back of the TV. If the picture is clear, your converter needs to be exchanged. Give us a call or stop by your local office and we?ll switch out your equipment.
Check the fine-tuning of your TV