Question about LG 47LC7DF 47 in. LCD HDTV

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Lg 47lc7df hs sound but no picture

One time turn it on and it has the snow screen. One time turn it on and it had a picture and sound. One time turn it on and sound but no picture. Then when trying to click a channel it goes to a blank screen with no sound and no picture.

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6ya6ya
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Posted on Jan 02, 2017

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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.

Posted on Jan 17, 2008

  • 1 Answer

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?

Posted on Mar 29, 2008

  • 21 Answers

SOURCE: lg lcd tv screen goes

I had this problem on my 42" Philips. Just got it yesterday and worked fine on the tv stand. As soon as I mounted the TV to the wall via wall mount system, I had the exact same issue you did. Figured it out today.

The wall mount was putting pressure against the center of the back of the tv (tv set had a slightly rounded back plate, and the mount was a flat plate). As soon as I put spacers (part of the wall mount hardware set) between the wall mount braket and the tv so there was no contact except at the mounting holes, the tv worked fine.

My theory is the pressure pushed the tv back plate against some board components which caused them to overheat (no air flow); or put pressure on internal connectors. I dont know.

Hope this helps, may not apply to your situation.

Posted on Sep 18, 2009

  • 644 Answers

SOURCE: 47LC7DF, Green light comes on, blinks with remote

When you say that you have replaced the main board i assume you mean the power board? If the green light comes on and blinks when the remote is touched it was never a issue with the mainboard, if it was you wouldnt have any signs of power. In most lcd tvs you have the main board which is normally the power board, the signal board which recieves signal and hold settings of the tv which can be all in one, the other is the inverter board, which scrambles the signal to what you see on the screen, and next we have the back light which lights the screen so you can see the picture, sometimes in certain models as i have learned you can have power/inverter boards which means the inverter and power are all on the same board, in your case i pressume the inverter board is seperate board and probably the issue you need to address, you can buy these online probably the same place you got your new mainboard from. Hope this helps pls post bach what happens.

Posted on Feb 01, 2010

freelance-au
  • 131 Answers

SOURCE: LG 60PC1D making clicking sounds

Hi
A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.
Hope this helps
Please rate my reply ++++

Posted on Apr 05, 2010

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1 Answer

Lg 47lc7df tv blinks green light, no picture or sound


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Jun 27, 2017 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

I have an LG 47LC7DF and I only get a red light when the power is off and when I turn the power on, the green light flashes a few times and then stays on. I do not have a picture or sound. Please advise...


Red light means your tv is in the stand-by mode..There could be serveral problems? Like your Y main board,T con,Upper & Lower buffer..Need to have a professional take a look ...

Sep 17, 2011 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

Have a LG 47LC7DF tv and its starting to have a hard time turning on. Green light flashes for 15 secs and screen lights up a little with no picture or sound. Have to unplug it to shut it off sometimes....


Hi,

Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Hoping this work out in solving the problem.....

Jul 05, 2011 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

My lg tv when i turn it on the picture blinks three times n then turns off


If the set goes dead after 3 times then suspect power supply, if a light stays on then main logic board.

Dec 14, 2010 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

When I turn the tv on, it first flashes green 19 times, then on the 20th it stays on and the screen seems faintly backlit but no indication of a signal, i.e., on-screen HDMI input selection. It's just a...


Hi,
I hope our talented expert would have given you correct and helpful info in chat session from related service manual, let me know if you need further help.
Thanks.

Sep 30, 2010 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

Problem for LG 47LC7DF 47 in. HDTV LCD Television it just flashes red and takes a couple of minutes to turn on and makes a popping sound..


television just flashes red and takes at least 15 minutes to turn on after turning off and on and makes a popping sound.

Apr 24, 2010 | LG 47LC7DF 47 in. LCD HDTV

2 Answers

LG 47LC7DF Green Light Blinks 16 Times - No Picture or Sound


Well dont keep it on!

By running it after it shutdown and it finally did its last pop that added another $XX to the parts bill.

The control boards (2) have now failed There are burned Capacitors ( pop!) and possibly even a few transistors burned out. This is not a DIY it is a Tech job as once changed these boards require additional tuning of the convergence factor.

Aug 31, 2009 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

LG 47LC7DF LCD TV turns off with a pop then turns back on.


Sounds like a overheating issue. Try facing a large fan blowing across the back of the unit and see if this changes anything. If it does, it might help to blow the back out with compressed air as dust might be helping it overheat.

Aug 08, 2009 | LG 47LC7DF 47 in. LCD HDTV

2 Answers

Vizio GV47L screen went black and is now unresponsive


Could be the power supply gone bad.
No easy solution I'm afraid.

May 20, 2009 | LG 47LC7DF 47 in. LCD HDTV

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