20 Most Recent LG 42LG50 42 in. LCD HDTV - Page 8 Questions & Answers

Hello,
It's the problem of overheating in the power supply board of the TV.on the power supply board of the tv there are few capacitors and IC.any of this ic is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop.
I hope this will help to solve the problem....

solution
step 1 : at first test your fly back transformer
step 2 : A.C. transformer test

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Ur last chance,might be the power supply board,could have very small amount dip current going through ur tv main Tuner board causes this problem.We might be fishing here,but this is the only logical answer left.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power suppply for the replacement.

Either your T-con is going out, or panel. More than likely your T-con.

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

do you have any lights blinking when you turn on your tv? if so are they blinking? what color? that information will be helpful to diagnose your tv.
thanks

Since service manual does not show the screws information (http://elektrotanya.com/lg_42lg5010,42lg5020,42lg5030_chassis_ld84d.pdf/download.html)

I would think they will be Metric M4, M5, or M6. They are about 25 cents each at HD, Lowes, or ACE hardware (those are the pleace where I get my Metric screws). The length can be figure out by using a small wooden stick insert into the screw holes to get some idea how long the screw should be.

Basic troubleshooting guide here: 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, long life rating such as PANASONIC FM or FC series.

DVi to HDMI. ? hmmmmm

I recon you spend £49.99 and get a DVI & Audio to HDMI Converter. This will resolve the issue

Do you have an HD ready cable/satellite box? It sounds like your tv is displaying your games in a resolution lower than what it can handle.

I have had the same problem for a couple of Months . Bought my lg in March 2009, just had it diagnosed as the Screen . Apparently they are not Lg screens but a cheaper version called AUO optrix . my tv is a non economical repair and i am waiting for Currys to get back to me . let me know if i can be of any help. Mike

check in the settings for the graphics card, with nvidia once you open the control panel, select change resolution and look for the connecter drop down, Mine shows hdtv-Audio enabled

You don't use screws for drywall to hang a TV, EVER.  That's a 50 pound TV.  You should only use the heavy stud bolts that came with mounting bracket and bolt them directly into the studs.  If by some chance the mounting didn't come with them, go to Home Depot or Lowes with the mounting tell them what you're doing and they'll get you what you need.  You are using a mounting bracket, aren't you? If by some chance you're trying to do this without a mounting bracket, STOP what you're doing and get a mounting bracket appropriate for your size television.  Go to Monoprice, they're the cheapest and their quality is excellent.  Meritline is good as well, they just take a little longer to get.  See the video below. You-Tube video "lCNyc-KgCDY" placeholder [unremark-end]-->(do not delete) http://www.monoprice.com/products/subdepartment.asp?c_id=109&cp_id=10828http://www.meritline.com/tv-wall-mount---c-13552.aspx

Yeah the issue here is your resoulution that your video card puts out is too high for the tv, you need to change the resolution then try again.


hope this helps please let us knwo if you have further questions. Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Enter the password "7777".

Your backlight controller is probably faulty and requires repair.

Either one of the inverter boards has a failing capacitor on it, or the FL (backlight) tube is burning out.
in your case, the most likely suspect is the tube.
The easiest way to find out if it's the tube or the inverter board, is to plug each of the tubes into the others inverter. This isn;t possible on all models because of wire length, but in most cases it can be done.
If you have the same problem on the same side, it's the tube
If the problem moves to the other side, it's the inverter.

You can either look for failed caps on the inverter, or just replace the inverter - the former being much less expensive if it's just a capacitor or 2.

If it's the inverter, here's a video that might help you out in determining what capacitors have gone and how to replace them.

http://www.youtube.com/watch?v=Mm51C_RDIZE (this is part 1/2)
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related (part 2/2)

IF it's the backlight you'll have to get the make and model of the LCD panel itself, and then go to somewhere like www.lcdpanels.com to order the backlight (or the entire panel if you don't think you can replace the backlight without damaging the panel).