Weak or no signal

Possibly your digital tuning PCB

part#: SSD-2104A-M2 $82.00 http://www.shopjimmy.com/catalogsearch/result/?q=SSD-2104A-M2

or your Audio PCB (includes tuner)
part# SRP0R021A-M2 $120.00 http://www.mcmelectronics.com/product/JVC-SRP0R021A-M2-/SRP0R021A-M2

$42.45 http://www.ebay.com/itm/JVC-HD-52G886-Audio-Board-SRP0R021A-M2-/111366506848?pt=US_TV_Boards_Parts_Components

$119.59 https://www.encompassparts.com/item/6195501/JVC/SRP0R021A-M2/P.w.board_Assy

I can't read the screen, but weak or no signal means the signal coming in from the cable box or outside antenna is not good.
You would need to check the box and the cable connections.

It could be the blanking circuit displaying a blue screen if no or a weak signal is connected to the TV. If you have a DVD or VCR try to see if you get picture and sound when ether of those devices are connected to the auxiliary input. If yes your signal input is weak, or you are getting no signal at all. If you go into the TV do you see text? If yes make sure you’re on the correct auxiliary input. If no text is visible the problem is internal and the LCD driver circuit needs to be repaired. If you see text and you are on the correct auxiliary input, but you get no picture and sound then the problem is internal and the front end tuner needs to be repaired. If you see video and hear the sound make sure your channel is correctly selected and set to a working channel. If you have a cable box remove the input to the box and connect it into the coaxial input on the TV and see if you have a picture and sound. If you do the cable box is defective. If you do not see any channels the cable may have lost its signal, and you should connect the cable to another device to check the signal quality. If you have a satellite service provider, and you use a known working device to check the signal and the device works then the TV needs to be serviced.

cable signal is weak. Tech. must check house wiring.

try swicth cable box for testing....if sam problem..need replaced tv main board

A weak or interrupted cable signal will cause digital dropout. Have your cable company increase the cable signal level to your box from their main office. They may have to send a technician out to measure the signal level to see if it is a problem.

More often than not the problem is with the Cable co. They ALWAYS blame the tv. I have had many many problems with the signal quality coming from that co. Here is the most likley cause. The cable signal is probably very Weak. This can be caused by a weak signal coming from the cabls co. or a bad cable inside your home. The age of the cable can effect the signal quality.Note: The cable co is only required to provide a Digital signal. Some companies allow free HD signals and some charge for that signal. The correct approach to this issue is to get with the Cox and ask the if they provide free Hd channels without a box. If they say no then you will have to get a HD cable box to watch HD programs. Themn if they say yes then you need to ask them to send out a tech and test the signal coming from the Head End all the way to your set. If the signal flucuates then you will get inconsistant scanning results.

Mine did the same thing once. I think all I did was hit the setup on the remote, and let it run back through all the channels and then it worked just fine.

I hope this works for you.

i just have a blue screen and it said no signal on the tv

it wont hurt to run both to the set, they wont interfere with each other