My tv does not have sound or picture in cable mode all the rest of the modes work fine

Change the hdmi cable and try. If not then you have an hdmi fault module.

Hi. Definitely call your cable provider. They will reestablish the signal to you. There is nothing you can do yourself. J.

Are the RCA cables matching(in tv to out sources.audio to audio and video to video)?And make sure the cables are in working condition

Replace the Main bd.

same problem on panasonic 51 inch projection tv awaiting answer

Changed cable.

TV SETTING
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select the Channel no. setting and use the or button
to change from AIR (over-the-air broadcasts) to CABLE (cable/satellite broadcasts).
4. Use or button to select the Tuning mode and use the or button.
5. Use or button to select the Auto tune and press or button to
confirm the selection. The unit will immediately search through all possible TV
channels and store those channels with signals in memory. After this is complete,
the unit will switch to the first channel found.
6. To exit the MAIN MENU and return to the normal screen, press the EXIT button.
Note : In DVD mode, this option is not available.
Remarks:
1. Channel no. : 2-69 channel for Air mode, 1-125 channel for Cable mode.
2. Tuning mode : Air or Cable mode are available.
3. Auto tune : Searches for usable stations and stores them in memory.
4. Skip : ON - Skip weak channels. OFF - No channel skip.
5. Fine tune : The frequency changes to allow fine tuning.
6. AFC : Auto frequency control.
7. MTS : Select the Mono sound/Stereo sound/Secondary Audio Program (SAP).
21
TV SETUP
MTS (Multi-channel Television Sound) SETTING
This feature allows reception of sound other than the main audio for the program.
1. Press the MENU button.
2. Use or button to select the TV setting menu, then press or button.
3. Use or button to select MTS menu, and press or button to select the
options (Mono, Stereo, SAP)
4. To exit the MAIN MENU and return to the normal screen, press the EXIT button
on remote control.
Note:
• MTS only operates while in TV mode.
• The SAP (Secondary Audio Programs) feature allows a TV station to broadcast
other information, which could be audio in another language.
RESTORE SETTING
If you reset the TV to the factory settings, all your present settings on picture &
sound will be erased and replaced by the factory’s default settings. However, picture
setting in PC mode and parental setting will not be erased.

Think it might be your batteries. 700mah batteries are pretty weak by today's standards (most are at least 2,500 mah these days). I'm guessing your batteries are several years old? If so, they're really only meant to have a usable shelf life of a few years, whether they are used or not. Recommend trying a new set of rechargeable batteries.

I have a Samsung HP5053 Plasma Flat Screen and there was a cracking noise and the picture clarity changed to dull. Does anyone else have information on recalls for this TV?

I think your TV is in the A-V mode. The X Box is going into the TV through the A-V jacks. (AUDIO/VIDEO). You should be able to switch the set to tuner mode with the remote. Look for a button labeled input or go into the menu and look for "input". Stargazer