LG 47LG70 42 in. LCD TV - Answered Questions & Fixed issues

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://homenol.blogspot.com/ http://electronicshelponline.blogspot.com/ If blinks continue without any pause, the main board is faulty. Search the site by type in the "brand name" to your device, [Exclude the model number] in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

I have had the same problem off and on with my 47LG70 for months. When the "popping" noise happens, the blue light in the corner stays on, so I know the tv is still on (sometimes I still have sound, sometimes I don't). Sometimes the screen goes black, but other times it is blue. If I turn the tv off then on again, it might stay on for seconds, minutes or hours. It's been very frustrating.

This seemed to happen right after I got my new Comcast box, which came with an HDMI 1.3 cable. I read somewhere online that this tv might not be compatible with that cable, so I unplugged it and am using component cables again. I just did this today, so I don't know if it will work, but so far the tv has been on for 30 minutes with no problems.

I'm pretty ignorant about HDMI compared to component cables. I imagine I will not get as good a picture with the component cables, but I am willing to sacrifice quality if I can just get the darn thing to work. Mine is also only 18 months old.

Hope this helps. If it doesn't, maybe someone else out there can help us both.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Surf the site with patience. If blinks continue without any pause, the main board is faulty.

Maybe Bad caps in power supply,Crack or splits on top of cap or leaking, Check value of caps in power supply.

That usually is an adjustment made on whatever source you have hooked to the tv. Some tv models will minuliplate the picture but not all.

How many times this standby/power light blinks at one time switch ON? Count it carefully. These blinks are fault indication, and known as blinking codes. From the number of blinks occur at one time switch ON; you can get an idea about the faulty circuit stage inside the TV. This will make repair easy. For more information, check the link http://electronicshelponline.blogspot.com/. If the blinks continues, and non-stop, the fault should be with its main system control IC, and with the memory IC.

faulty power button

You should try tristatemodule.com it sounds like its your main board thats shorting out give them a call and they can give you a cheap price on a replacement and guide you through the repair over the phone.

go into settings or setup and find speakers then make sure there turned on or check mute setting also

It sounds like the standby 5vdc power supply is not working, without this 5vdc, nothing else will work. You will need to do more in-depth troubleshooting, starting at the power supply module.
Service manuals: http://elektrotanya.com/?q=showresult&megnev=LG&megnev2=47LG70%20&kategoria=&kat2=all

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Basic LCD monitor and TV troubleshooting guide: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Parts: www.interliquidparts.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Hello,
The 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.


I hope this will help in solving the problem, also do take care in handling the fault....

You will need to replace the Sub PCB. Its about a $50 fix if you do it yourself.

You can find the part here.

Its part 510.

This circuit board controls the volume, channel, menu buttons, ect.

Tries hook up to a roof antenna or a better antenna like a digital antenna.Than rescan ur tv again,for those DTV free air channels again.Ur tv now,should get all those DTV free air channels.

At first the problem sounds like it could be the main printed circuit board, but is odd, because the audio outputs come from the main printed circuit board. Does the TV have the audio output running from the unit? Is the main question.
What I would suggest is, depending on how old the unit is, for instance, if it is only a few months out of warranty, contact LG and they may offer a once off 'Parts Only' or 'Labour Only' warranty for this problem as a gesture of good will.
The unit is getting power, we can tell because the audio still works through the surround sound, so the power supply printed circuit board is ok.
The main printed circuit board, the one with all the outputs and and inputs, seems to be working as it still delivers sound to the surround sound system.
It may be the LCD panel, the logic printed circuit board, a small printed circuit board attatched to the LCD panel or in a less likely case (or not) a component on the main printed circuit board.
I suggest if you are tech savvy and have access to a multimeter or a voltameter, you can remove the back of the unit and test the voltages running from the power supply printed circuit board to the main printed circuit board and from the main printed circuit board to the logic board and also to the voltages leading from and to the LCD panel.
Also keep and eye out for any blown capacitors, the look like a battery with the top bulging out when faulty as they are a common cause of certain issues becoming faulty and other issues still functioning properly.
I hope this helps, good luck.

It is either the 24vdc power died or the backlight inverter board shorted out, those are the two areas you need to check.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Please post back what you find.

From your description, the sound you are hearing is the inverter(s) that drive the back light for the LCD screen/module.
The inverters mounted on the back side (one lower right and one left side) of the LCD screen/module. They are under the sheet metal cover/shields.
The inverters are going out and or the LCD screen/module is going bad too.
That LG TV has only a 1 year on parts and labor from the date of purchase, but you could call LG and ask for their help for such a new TV. They might do it under a warranty, for little or no cost to you.
I hope this information has helped you.
Good Luck.

There can be several causes for this, few of which you can do anything about. However, a few things to try:

1) Replace the batteries on your remote control.
2) Try resetting the logic functions on your tv by unplugging it for a minute, then plugging it back in.
3) Try covering up the infra-red receptor on the front of your TV to see if you're getting unwanted signals from the receptor. taping a piece of foil over that area is perfect. If it doesn't stop after doing these two things you'll probably need to take it to a shop.
4) If this does stop it, then look for unexpected signal sources. Have you added a remote control extender? Added a new device to your audio-video system? Changed to a new remote?

I hope this helps. Joe

I am pretty sure you can press menu and go to picture than pick one of your viewing modes, than do avanced settings and scroll down, you should see tru motion and other settings, try doing this.

Question edited for clarity. It appears to be an LG rather an an IG. https://www.avforums.com/threads/lg-42lb1db-how-cani-remove-the-swivel-base.519459/ Further Help and videos https://www.google.com/search?q=lg+42lb5df+remove+base+stand ..

The screen blank out