20 Most Recent LG 37LC7D 37 in. LCD HDTV - Page 6 Questions & Answers

Look at the back of the screen. There are four screws near the bottom that must be totally removed. A magnetic tip screwdriver would help. Once they're removed, the screen will just slide straight up. A problem could occur if they were screwed on too tight in the beginning. If that were the case, good luck to you. You may need to use easy outs or other such tools.

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom (look for discoloration of the circuit board around the base of the capacitor) need to be replaced.
If you repeatedly turn it off and on, eventually it'll probably stay on, but every time you turn it off, the unit will get harder and harder to start up until one day it just won't.
Sometimes you have to do the opposite to start it up and unplug it for some time and then try again.

If you aren't tech savvy, don't worry, read the rest of this solution and watch the videos.

If you are handy with a soldering iron and can identify the power supply and/or inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are SURE it's only doing supply output ripple filtering,
and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.

http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors, amplifiers, computer power supplies and motherboards, and other electronic equipment.
The parts are cheap, and skill required is minimal.
A great parts source is Digi-Key, and you can order the parts online at www.digikey.com
They typically cost under a dollar a piece plus a flat shipping rate.
The parts usually arrive one business day later.
If you watch the third video, you will see that even someone with no soldering experience can perform these repairs as demonstrated by the woman in the video.

2 possible causes: either the backlighting or the panel controller (the T-Con) have failed. To find out which get a powerful flashlight and point it at the screen with the room darkened: if you can see an image then it's the backlighting, if not then it's the T-Con.
The respective boards will have to be replaced.
T-Con
http://cgi.ebay.com/LG-LCD-TV-37LC2D-LCD-Controller-6870C-0060H-/250830457248?pt=LH_DefaultDomain_0&hash=item3a66a909a0
The backlighting inverter
http://cgi.ebay.com/LG-37LC2D-UD-LCD-TV-INVERTER-BOARD-T87-/370522201932?pt=LH_DefaultDomain_0&hash=item5644d81f4c
Or you could get an entire tv for parts
http://cgi.ebay.com/LG-37-LCD-HDTV-37LC7D-Screen-Cracked-Broken-/120746677577?pt=Televisions&hash=item1c1d101549

Hello,

If you are getting the following kind of breakdown:
The TV do not starts (the LED flashes) and / or slow start then you can refer the following solutions

Replace capacitor C2937 / a 10µF 100µF
Add a 63v capacitor of 1uF / 16V / position 2936.
Change resistance R3955 / 220K with a 4.7 K
These are found in the power section of the television
I hope this may solve your problem but for you must have some technical knowledge about it.

Good day!!!

that problem is not on the settings or adjustment...that is cause by bad inverter board..

please try to replaced it to fix your problem..

thank you for using fixya..

have a nice day!!!

Tries tv and the dish box unplug,replug it back an hour later for the tv to do a restting itself back to the factory setting and dish box to reboot and upgraded it software.This no signal problems should be fixed,not request another dish box for the replacement,because tv have no signal input bouncing around in the tv screen it is 90%-95% are broadcasting receiver boxes for tv incomming signal cable for tv signal problems.

Have you tried changing the input on the controller, from say ext1 to hdmi

An LCD TV set need to used a picture in native resolution for give you a good picture. In other word you need to receive an HD signal to have a nice picture. If you tune on a station that give you a none HD signal you will see a dull picture like you said. The only way to dont see this effect in standard d?finition is to use or buy a plasma tv set. Or check only HDTV.

Hello,

Connect your TV to a DVD player. If there is still no picture, it means the display inverter of your Tv is defective.

The display inverter is what makes the TV brings picture. Since the TV is no longer bringng any picture, the display inverter is the first thing that needs to be checked as it is most likely the cause of the problem.

Please give me feedback if you need any assistance in locating or identifying the display inverter.

Your sincerely.

Elect_Comp.

Sounds like the power inverter is on its way out, or the backlights... Either or its not a completly easy fix but with some background in electronics is do-able without having to send the unit out.

However if this unit is within warranty I always strongly encourage to keep the unit within warranty and send it out the the manufacture for repair through them as it is the only guranteed no loss solution.

Best course of action would be to wait it out until either or goes, when it finally does you have to determine weather or not its the actual inverter or the backlight...

When you pull the unit apart and take out the core from its plastic casing, you will find a large chip-board with thick wires running to the top and bottom of the unit this is your power inverter. If you follow the two white wires to the top of the unit and the bottom of the unit youll see what resembles two small florescent lights. These are your back-lights. If you hook those up to either the power of a usb cord (red and black when stripped) or a toss the wires into the positive and negative of a TV remote with fresh batteries you will be able to determine if the back lights are good.

If they are then its your power inverter by process of elimination. You can pull the part no. off the back of the unit and type it in here...

www.sparepartswarehouse.com

You will be able to find the replacement unit and hopfully all will bode well...

If all else fails you can toss it on ebay for AS-IS to someone who has a bit more experience tearing these things apart

Plasma and LCD TV sets are prone to having capacitors in the power supply section fail. This is the most likely cause for the probem you describe. When capacitors fail your will commonly see one or more of the following symptoms.

• No video, Power light is on or blinking.
• TV is making a clicking noise.
• TV takes a while to come on
• Screen is very dim or flickers.

Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit.

Here are pictures of capacitors...Notice that the ones below look bloated. They have failed and will need to be repalced.



Capacitor being replaced! Fairly easy DIY fix.


Again, You can get a power supply repair kit with the parts, detailed instructions, and support from sites such as www.TvRepairKits.com . Or just click here to see more details on their kit.

There are 4 bolts in the center on the rear near the bottom. Remove these bolts and the stand will just slide out.




Please leave feedback.

Cheers

Andy

Hi

Try to play the DVD on your TV,if the picture is normal when you play it.The problem could be the signal of you aerial antenna or cable.

Thank you and good luck.

Any brand of USB Wireless Adapter will work. Netgear, Linksys, etc

It should have an auto adjust built into the set. If you are using it as a pc monitor, you need to make the adjustments yourself on the PC.

Sounds as if the power supply has gone. Usually when that happens with no other problems piror it is the capactors in the power supply.If your tech savy you could look at the caps to see if they are swelling.If some are you need to replace them.My 52"samsung did just as you discribe and I had to replace about 5 caps in mine at a cost of around 10 bucks.Good luck.Hope this helps

First of all, here is the main ONLINE SUPPORT page for your model:

http://www.lg.com/us/support/product/support-product-profile.jsp?customerModelCode=37LC7D&matchedModelCode=1000002391&searchEngineModelCode=37LC7D&initialTab=documents&targetPage=support-product-profile


To view the Support Page just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated.

To download and view the OWNER'S MANUAL click on the MANUALS AND DOCUMENTS tab and then OWNER'S MANUAL- ENGLISH (2,290K) button. Then just SAVE it on your computer somewhere like the DESKTOP so it will be easy to find later. When the file finishes downloading then click OPEN and the you can view the manual.

You may need ADOBE READER installed on your computer to read PDF documents. You can download this free at WWW.ADOBE.COM if necessary. Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, and then just follow the onscreen instructions to install it.

See page 10 of the USER'S MANUAL for a detailed illustration of the connections on the rear panel your TV. The set is fitted with analog and digital AUDIO OUT connectors.
See page 31 for a detailed description of the AUDIO OUT connection process.

Please comment back here to this page if you have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.

Thank you very much and good luck.

Joe.

Go into your user menu to picture preferences and put it on 16:9. Or simply just hit aspect button on your remote until you get to it.

One of these service manuals hsould match your chassis: http://elektrotanya.com/?q=showresult&megnev=LG&megnev2=37LC7D&kategoria=tv&kat2=schematics

It may be in the safety shut down/restart mode due to bad power supply or shorted circuits.
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 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. Please post back what you find.

You power supply has failed and requires repair.