Inputs I have a Samsung model pcn5425r big screen. My 1080i av inputs have picture but no sound. The standard inputs and RF inputs work fine.

AV inputs are for standard analog video which is 480i. HDMI and Component inputs are the high definition inputs that run at either 1080i or 1080p You won't ever get 1080i or p through AV inputs.

Chek your INOUT signal if this is low the picture will be bad. Also check the picture in the AV and if there is a good picture the TV is working fine except for the RF input.
You need to check on the tuner and IF sections.

Probably not. Better picture results are achieved with either S-Video, standard RCA AV cable (yellow-white-red), or YUV component cable (red-green-blue) (component output does not have audio - this requires extra cable to be connected). The video via either one of these 'AV' connections is stunning (based on a standard 16:9 LCD TV using a Panasonic DVD recorder).

RF tends to be lower quality - as opposed to AV/digital input. AV input/YUV component handles digital better. No one connects their DVD devices to their TV via RF (either directly to the antenna socket or with a modulator/attenuator) anyway. Because a VCR is mostly analogue, it will work fine with an RF connection, but DVD is digital, and so won't work as well, if at all.

RF also goes through the tuner in a TV, creating cross-interference, whereas AV is a direct input and is separate to the tuner.

I would say an RF modulator would not be designed to handle the output frequency that your DVD device generates. Throw the modulator out, or perhaps get another TV, or use RCA cables instead if the TV has AV inputs. Whichever is cheaper and easier, but don't use RF accessories except a standard antenna if/as required.

hi bob you should be able to adjust the screen size via the menu on the monitor itself, (Available in Analog mode only) Note When TV signal is input in AV mode ,select “Screen Fit “to adjust vertical position in 0-6 levels. Image Size Note Supplied for the wide models only such as 16:9 or 16:10. You can change the size of the screen displayed on your monitor. PC signals • Auto - The screen is displayed in accordance with the screen aspect ratio of the input signals.• Wide - A full screen is displayed regardless of the screen aspect ratio of the input signals. Note • Signals not available in the standard mode table are not supported.• If the wide screen which is the optimal resolution for the monitor is set on your PC, this function is not performed. AV signals • 4 : 3 - Sets the picture to 4:3 normal mode. • 16 : 9- Sets the picture to 16:9 wide mode. • Screen Fit- Use the function to see the full image without any cutoff when DVI (480p/576p/720p/1080i/1080p) signals are input. Note It can only be selected if an external input is connected to the DVI terminal and the 'PC/AV Mode' is set to 'AV'. • 4 : 3 - Sets the picture to 4:3 normal mode. • Wide-Sets the picture to 16:10 wide mode. • Screen Fit- Use the function to see the full image without any cutoff when DVI (480p/576p/720p/1080i/1080p) signals are input. Note • It can only be selected if an external input is connected to the DVI terminal and the 'PC/AV Mode' is set to 'AV'. • When the panel is of 16:10,the screen size options include “4:3”,”wide “,”Screen fit“.hope this helps

LAMP

In short your tv has a problem on the AV connection, RF using coaxial cable is working okay.
get the tv to the w/shop, let him check the AV panel and AV processing IC.

open the tv and check for dry joints on the jacks of AVS, if no dry joint is found
the ariel in put is different from AV inputs
change the AV in IC. AT THE W/SHOP

This is not an HDTV. However, that does not mean you cannot use it to view the HD channels with DirecTV, you just wont be able to view them in hi-def. Use the component inputs from the directv tuner and plug those into the proper component inputs of your JVC. Once you see the DirecTV picture on the screen, go into menu... setup (with the directTV remote) and make sure that the only resolution checked is 480i. DirecTV with 'downconvert' those cannels to standard def, and they will still look pretty good though the component connection...

... now, in answer to your next question: "What exactly do I need to view HDTV with DirecTV?"...

1. A television that will accept 720p or 1080i signals.
2. A DirecTV HD Tuner.
3. Any DirecTV service BUT you must purchase the HD pack so that they will 'unlock' the HD channels
4. The proper cables to hook in between your DirecTV HD receiver and your HD-capable TV/Monitor. You may use either HDMI or component video cables, so long as your TV will accept them. Tune your TV input accordingly. When using component video cables, you must also run a separate cable(s) for audio...

Take care,
Rob

ps. DirecTV HD tuners do not have an RF 'out'. ("coaxial or ch3/4 connection")

If you have set the component output on the ps3 for high def,ie 720p or 1080i and do not get a picture it sounds like the component input is not high def enabled on your amp,change the setting on ps3 to standard 576 output,or put picture into tv then sound into amp if you want to run 720p or 1080i.

Hope this helps.
CABLE GUY.

u change the colour system 2 pal