Menu displays but no picture. 3 guns are working. No smell of anything burning. Figure it might be rf converter. Is it possible to troubleshoot to component level? Can a module be found for the tv? thanks.
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Re: P61940 Sound but no picture
Has a good sound, a no picture symptom is definitely in the video amplifier circuits. First monitor the signal at the base and collector of video amplifier and at the cathode of the picture tube .This should be followed by measurement of the video amplifier transistor element voltages .As in the case of any amplifier, total failure of the circuit is usually easy to locate.Look for such defects as open coupling capacitor and coils, cold solder joints, open or worn ,breaks in printed circuit connection.Keep in mind that video output amplifier is a power transistor and is therefore subjects to being burned out if its heat sink is defective.Also try to set the brightness to minimum.When the vertical deflection is lost the beam current is concentrated in a single horizontal line across the screen . Find a local technician there to do works for you , in order to avoid high voltage shock.....
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Most digital converters provide two types of output: an RF output that connects to the antenna input of your TV and left audio, right audio, and video outputs that connect to the corresponding inputs of your TV. The RF output connection produces a digital picture on channel 3 or 4 (selected by you at the converter) with your TV set to the appropriate channel. The L/R audio and video connection produces a better quality picture. Choose one or the other, but not both. The picture you provided shows three possible inputs for the L/R audio plus video arrangement.
If you changed the RF out channel setting on the DTV converter and now can't see the output of the converter try changing the channel on the TV set. THe DTV converter boxes are designed to output either RF channel 3 or RF channel 4. If you were on channel 3 and changed the converter output to channel 4, you will have to change the TV channel to channel 4 to see it again.
If you have the box connected to the TV using an RF cable to the TV's antenna input, make sure the TV is on channel 3. You should at least see the boxes menu display when the power is on. Try channel 4 if you see nothing on 3. Every box I've hooked up has been on channel 3 by default, but who knows?
If you can, hook the box to the TV using direct video and audio connections, and make sure the TV is set to the correct input.
Unless the box you bought has "RF pass-through" (and if you got your box using a government coupon, it's a sure bet it doesn't) you will notice a marked drop in quality if you try to watch regular broadcasting with the box connected. I've been installing these with a bypass arrangement so people can still watch their analog broadcasts until they go off the air in February.
If the box does in fact have no display when you turn it on and your TV is on the correct channel, your box is defective and should be returned and replaced.
Be sure that your TV is set to channel 3 or 4 if you are using the RF cable or Video 1, etc if using the Audio/Video cable. The Installation Guide should appear. The "improved" picture that you are seeing is simply the analog throughput, not the digital conversion.
Ther is a test you could do is you had the proper equipment, and that would be to inject a know good RF signal into the tunner F connector and chech tha point where the RF/IF is converted to audio and video, to determine if the proble is a bad tuner or not. The equipment is a VA62A Universal Video Analyzer. Its a great piece of equipment for this type of work. another thing you can do is get an RF Modulator from Radio shack and input a video and audio signal in to it and set it to channel 3 and connect the F connector to the TVs F connector. The set the TV to channel 3 you should see the picture and hear sound in channel 3. The VA62A is best because you can set it to emulate all of your channels from 1-87 standard TV and Cable TV. In any event a test needs to be run to see if the tunner is at fault.
only thing I can think of is for you to check your cables... assuming you are using a coaxial cable for the satelite and rca cables for games and dvds, I would recommend trying a different coaxial cable. There is also the chance that the coaxial connection on the tv itself is messed up. you may try buying an RF modulator that will convert coaxial to rca, most rf modulators convert rca to coax. so make sure it does what you need before you buy it. tech guys at store should be able to help if you can't figure it out.