I recently attempted to use the hdmi ports on my 4 yr old lg 47 inch LCD. When attempting to connect my cable box , there's a picture and sound for about 2 seconds then it goes blank. When attempting to use my roku box, I see the menu and am able to choose a channel and a show , but once it starts I only get sound with no picture. What's really crazy is if I pause the roku remote then I'm able to see the picture . I've called my cable company, roku and LG. No one has any idea what's going on.
SOURCE: 42 inch LG Plasma TV - Lost picture
Our LG 50" plasma tv screen went black after a popping noise but still had sound, after great diliberations decided to take the back off and have a peek!
We unplugged the tv and tested the fuses (there were three we could see) one had blown, the one on the left as you look at the back of the tv it also has one above it. We wrote the code/seriel number down and took the fuse to the electrical wholesalers Maplin and bought a pack of 10 fuses for £1.29 replaced the fuse in the tv and everything now fine!!!!!!
Hope this might be of use to anyone whose lost the picture after a loud popping/snacking noise but still has sound.
SOURCE: LG 47" LCD TV - 47LC7DF Clicking Noise
I was told that these clicking noises (which happen on my Magnavox LCD too) were due to the "power required" at the internal switch. Seems that the power required to immediately turn on the TV is too much for a standalone household outlet, so it "surges" power in a series to get enough there. Hence, the clicking sounds are actually mini power surges to send more power to the internal circuits to turn the TV on.
If your set is like mine, these noises generally stop after a minute or two, correct?
SOURCE: frozen picture on LG LCD 37"
Try One of your working TVS and connect it to your cable outlet of the TV that is having problems. If that TV Does not work then there may be a degraded fitting or the Leg coming of the splitter to that outlet could have a Low Signal Problem
Next Take the First TV that was not working properly and put it on the cable outlet of one of the TVs that is working properly and if the TV set works on that Channel then you know it is not your TV that it must be the cable
SOURCE: 42 inch LG Plasma TV - Lost picture
Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.
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