20 Most Recent Mitsubishi LT-40133 40 in. LCD HDTV Questions & Answers

Try first to see if it happens via a rear audio/video input with a DVD etc----this may narrow down what the issue is.

There are two possibilities - bad T-CON board and bad LCD.

In the first case you need a new T-CON in the second - a new TV.

it is usually the LCD and it's usually caused by overheating and detachment of the very delicate LCD with multiple tracks from the board that makes connection with the T-CON board.

It starts working after it heats up because all materials expand as temperature raises and that helps contact a place that was previously melted and detatched. We're talking micrometters here.

An experienced TV technician may have luck identifying the place and applying physical force there so that it doesn't detach.

However, it's a technology issue and if it has happened in one place of the LCD it will happen in another over time.

Contrary to what popular belief is competition isn't all good for customers.

Competition leads to lower prices and from there to lower quality.

All consumer electronics - and particularily the TVs - are an excellent example of this.

Not sure I helped you much, but hey, don't kill the messenger.

For more insights see http://www.coppelltvrepair.com .

It sounds like a problem with the LCDD controller. Do these lines appear when its on the no signal screen as well?

90 percent of the time with these sets you will be looking at the lcd panel. on some occasions you may be able to replace the tcon to resolve this but its unlikely. sorry sounds like this may cost you a bundle. look towards a new set

Check ur power source?Tries tv unplug,replug the tv back like about an hour later.Now the tv are resetting it self back to the factory setting.The tv should work now.If still have the same problems,some how ur power supply board is causes and is not providing the tv the wright voltages anymore.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

This can be a defective T-con module or Control module. Best to have it diagnosed by your local service center. It's to costly to play a guessing game.

Try connecting the TV directly to a different wall outlet and check. If the issue persists, try power resetting the TV. Turn Off the TV and remove the power plug from the wall outlet for 1 minute and reconnect it and check the operation. If the issue persists, then the TV may require service.

Vertical lines more likely to be caused by bad T-CON board, you need to check the connections between the T-CON board and the main logic board, it can possibly be the main logic board also.
Please see my basic troubleshooting guide:
http://s807.photobucket.com/home/budm/allalbums

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: try www.shopjimmy.com or Ebay

Similar problem with an eleven and a half month old LT-40148. Approx. 1 inch vertical banding line on left side of screen on all inputs. After about two weeks, same problem on the right side of the screen.

Fortunately this occurred two weeks prior to the one year warranty expiring.

Called Mits customer service and they referred me to an authorized service center who I happened to have dealt with before.

They picked up the set. The front panel (LCD screen ) had to be replaced. Set was gone for two weeks as parts were not in stock. There was no charge. I hope this screen last more than a year.

That is bad sign of the bad LCD panel itself, but you can try replacing the LCD driver board first. The new LCD panel will be very EXPENSIVE! It will get worst as time goes by.

I've got the same TV with the same problem. Sometimes by moving it on the stand the lines will go away but it only sometimes temporarily fixes the problem. For a while it seemed like it needed to heat up to go away but that is not the case. It seems like there is a bad connection somewhere but i cant seem to find it. One day, one thing will fix it, then the next day it wont do the trick. It gets very irritating.

I assume your Misubishi is not close to anything electrical. However, it sounds like you have had an interference for some time. This will ineviteably cause the HDTV LCD to collapse. LCD's don't respond well close to heat. Is there a vent close? LCD's do well in a properly vented area but with all this said.......they will pick up interference from anything electrical. A few questions to ask ones self........are there any wireless devices or chargers close to the LCD? Might there be an oven, a/c unit or other wiring with 220 volts anywhere close to the LCD such as in the wall?
The Mitsubishi LT is a very reliable, multi component ready set that allows great viewing with surround sound. However, stop and think about this interference. It is not something in the unit. It is an interference. Look hard and when you've discovered it.....you won't believe how crystal clear this set will be.
Let me know what you find...Thanks for using Fixya and add any comments that may help us help you.

The lamp is not enabled possibly due to the colour wheel motor not turning. Any broken glass jamming it? Or the lamp ballast has failed due to an old/worn lamp.