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Tv screen failling to switch on to dvd player.how to fix it ?Model is LG with cathod lay tube.

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  • LG Master
  • 5,138 Answers

Make sure TV is turned to CH3. Problem could be DVD player!

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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Multi region hack for LG


follow this steps and fix it. God bless you
1. Switching Regions o 1
Turn on your DVD player.
o 2
Open the DVD player's main drive, also commonly called the DVD "tray." The region cannot be changed while a DVD is in the machine, so many DVD players require the tray to be open as an extra precaution.

o
3 Push "Info" or "Setup" on your remote.
o 4
Use the remote to select the "Region" option as indicated on your TV screen.
o 5
Select "Region 9" to change the system to multiregion formatting. Regions 1 through 8 represent specific geographic locations and will not allow multiregion playback.

Jul 28, 2013 | Televison & Video

Tip

Cathode emission check for colour picture tubes


<p>How to check the colour cathodes of a picture tube for emission<br /> <p> <br> <p>It is very easy to cehck the emission of the cathodes of a colour picture tube. Assuming all other circuit parts are working, including LOT [Line output Transformer] and video output section.<span> </SPAN>There is proper screen voltage; focus voltage and EHT [Extra High Tension]. Locate the three cathode points on the base card, usually marked as Gk, Bk and Rk.<span> </SPAN>Keep the brightness, contrast and colour control to zero position.<span> </SPAN>Take a wire of suitable length, say 50cms or so, tie its one end to TVs chasis [negative].<span> </SPAN>Take one resistor of value 100K 1W, tie its one end to the other end or the wire, thus one end of this resistor is now connected to negative chasis and the other end of it is free now.<span> </SPAN>Hold this resistor with with some electrically noncunductive material [using hand gloves will be better]; switch on the Tv, wait a minute or so to get it warm up.<span> </SPAN>Just make a touch at each cathode of the picture tube base card solderings.<span> </SPAN>Just one touch will give you a colour of the respecive cathode on the screen.<span> </SPAN>Never hold it for long time. This process can be used for checking cathode emission of any type of Cathode Ray Picture tubes. <br> <p>

on Apr 18, 2011 | Televison & Video

Tip

SONY TRINITRON ONE COLOUR PREDOMINANT SCREEN


Sony Trinitron sets are of CRT [Caothde Ray Tube] types. The common fault seen in these type of TVs are any one colour predominant on screen wih sound OK. Either red, blue or green colour with some thin horizontal lines at about an inch apart will be seen on the entire screen. This is totally a display card problem, which can be seen pluged onto the picutre tube neck. There are three electron guns for every picture tube, which emits red, blue, and green beams, which in turn illuminates the phosphor on the screen to get that colour. If no emission from all guns, results in a blank screen, ie black screen without any disply at all. The three colour beams together produces proper coloured picture what we see on screen. These three gun's terminals are brought out by pins of the picture tube outside to which video signals are given in appropriate proportion to produce a TV picture. Normally, all these three pins are biased with a voltage of about 170 to160VDC+ve. Take one colour gun, as an example and and let me describe the problem.
Let it be a green gun. These guns are called cathodes of the picture tube. If it gets a voltage with respect to its grid, it will emit electrons according to the voltage applied to it. This is a negative process, that is, as the voltage at this pin drops, its emisson incresses and vice versa. If the emission increase, the colour with respect to that gun also will increase and gets predominant at the screen. So when we see a green predominant screen, there will be less voltage at the green cathode with resepect to the other two. If red colour is predominant, the voltage at red cathode will be less than the other two. If blue colour is predominat, the voltage at the blue cathode will be less than the other two.
We must find out the reason for this fault first. Assume that your Tv has a red predominant screen with some thin lines across it, at about one inch apart of the entire screen, it is clear that the the red cathode voltage is very lower than the other two. the main reason for this fault, normally seen in most of the Sony Trinitron, are loose soldering points either to the picture tube base socket or the resistor connected between the red drive transistor's collector point. Resoldering the most of these points on the base card by applying a little more solder will rectify this probelm. Other possibility is shorted video output transistor of that cathode. A direct short [collector to emitter] of these transistors will drop volatge to very low at that respective cathode of the picture tube, and that colour will be pridominant along with lines. Replacing the transistor will solve the problem. In some cases, the resistor connected to that transistor may have blown out. If so, it should alo be replaced. Whatever the case may be, voltage at the respective cathode that emits colour will be very low with respect to the other two. Find out the reason and rectify it. You can compare the voltages of the other two cathodes with respect to the faulty colur cathode. Cathode pins will be marked on the base card, and can be identified. It is best to pull out the base card from the picture tube neck and place it somewhere a safe place without shorting it with other parts of the TV. You can measure the voltages of these points very easly, without fearing the damge to the picture tube. After all are found Ok, replug the base card and switch on the TV. The set will be alright. In rare cases, chroma IC also can be a reason for this fault. if it is faulty, after a short period after switch on the TV, the IC will overheat and shutdown the entire system.

on Mar 21, 2011 | Televison & Video

2 Answers

Unlock area code for LG DV450 Dvd Player


Make sure the TV is set to the DVD player.
Press OPEN on the DVD player.
Press PAUSE on the remote.
Enter the code 314159 on the remote.
The TV screen will show a prompt for region code - press 0 for multiregion.
Press PAUSE on the remote.
Switch the DVD player off and wait for 30 seconds.
Switch player back on and it should now play DVDs from any region.

Mar 07, 2011 | LG Televison & Video

4 Answers

Every day when I first turn on my LG HDTV model 42LH30 it has the left side completely black but the right side seems normal with a distinct center vertical line. After a few minutes the left side gets...


LCD TVs are side lit with either cathode tubes or LED's (depending on the model). This saves space and allows the TV's to be so thin. The newer LED TV's are backlit, so there is an array of LED behind the screen, but because your model is side lit, most likely with a cathode tube, that the tube is on it's way out and takes an excessive amount of time to warm up and get to full brightness. You culd try looking up a part number through LG, but my guess would be it's expensive and not easily replaced. Perhaps contact a local electronics store to see if they ofer repair service and see how much it costs versus buying a new tv.

Mar 02, 2011 | LG 42LG30 42 in. LCD HDTV

1 Answer

Have pixelated lines that run across the screen from time to time. They are worse when I turn the TV off for a period of time then turn it back on. How do I get rid of them?


You really don't other then sending it in. The cold cathode tubes for the back light causes an expansion and contraction do to heat between the LCD glass and these little IC ribbons that lay between the LCD glass and the signal processor's main board. The reason why they get worse when you turn it off is because the colder temperatures make the ribbon cables contract off the LCD's glass pane. There is not a convenient or easy fix for this at all.

Apr 19, 2010 | LG 47LG60 LCD TV

1 Answer

Tv Screen Turns blue occassionally while running Toshiba DVD player


If the flashing is regardless of source, the CRT could be at fault. H to K short. ( heater to cathode)

Jul 23, 2008 | Toshiba MD20F51 20 in. TV/DVD Combo

1 Answer

Screen is dark


If it uses the same technology as a laptop screen, there is 2 backlights behind the screen, they are like very thin fluorescent tubes (cold cathode) and there is a power supply that these use. It may have gone out like many PC's bad displays. I think it is due for replacement or an operation if you are skilled enough. Might just be an unseated ribbon cable which can be fixed by yourself.

Mar 03, 2008 | Cyberhome CH-LDV7000 Portable DVD Player

2 Answers

Audio..Black Screen?


Either the backlight tube or the board that drives is broken, probably the tube - it's a cold cathode fluorescent, usually along the top or bottom of the screen. It may be fixable, but probably only worth it
if you DIY and can get replacement cheap enough. They can be a real pain to get to, usually cheaper to get a new player.

Dec 13, 2007 | Polaroid PDV-0700 Portable DVD Player

1 Answer

Dmtech 20 inch lcd tv dvd


These problems ocour when the inverter of Cathode tube fail in lcd tvs basically the tv need an inverter (mot likely)

Dec 04, 2007 | Televison & Video

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