20 Most Recent LG 37LH20 37 in. LCD HDTV Questions & Answers

Power supply module will be the first place to check, please read my guide first to get basic understanding of LCD flat panel TV.
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: 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. Please leave rating if it helps.

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. Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here. ..

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

Sounds like a power surge hit your TV. Typically when this happens capacitors on the power board with blow. You can buy a repair kit for this problem from several of the dot coms out there. The best one I have found has been tvrepairkits .com. Hope this helps.

check the caps on power supply board.

check caps in power supply.

check for bad caps in power supply.

What do you want to know? Update procedure? Reset procedure. Please be clear. If you wish to know more, check this link.http://electronicshelponline.blogspot.com/ Pull up previous posts there, either by its left side bar, or view it in Timslide option.

You have to have Remcon remote to get into the service menu.

Possible failure of the main power supply which is a SMPS unit. So please check this link below as it can also be a fuse failure.

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

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

Backlight related video here:
http://www.youtube.com/watch?v=6XoF6QZ1dmw&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.

Unless you hook HDMI to HDMI, you won't carry sound across the HDMI cable. If you're using a VGA to HDMI converter, you'll get the picture but no sound.

I have a feeling the headset jack on the TV is an output rather than an input. Most TVs accept HDMI, RCA, or a digital audio input (either coaxial or optical). Unless you have a S/PDIF optical output from your laptop (and you obviously don't have an HDMI output), then your only other choice is likely to get a cable that splits a 1/8" headset type connector into two RCA plugs that you'll plug into an AUDIO IN input on your TV.

Hi Jason,
To hear the sound to your Bose Audio system from LG 37LH20 you must have an optical cord, and your bose must have an optical audio in.
RCA Jack of LG37LH20 is only for audio IN, there's no RCA Jack audio out from this model that's why you can't hear the sound even you hook up the Bose from that jack.
To make it possible, hook up the optical cord to your TV and then the other end to Bose Audio system.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Their are a lot of things that could be wrong with your TV. The most commond would be your power supply or your signal board. If you look at your power supply carefully, You might see some capacitors that look like they blow up. If that's the case then replaceing them might fix your problem if not then you might have to get a whole power supply. You can get parts for this TV at www.interliquidparts.com

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