Question about LG Flatron L1951S 19" LCD Flat Panel Monitor

1 Answer

There are only red,blue and green colours displayed on my LG tv

DISPLAY IS COMING WITH ONLY THREE COLOUR IE. RED, GREEN AND BLUE.

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 24 Answers

This can be the panel check required during manufacturing sessions.
Your only choice is to call the experts in to perform a selfcheck so that the whole system can be rebooted.

A self check is like when you reformat and reinstall your windows into your PC. Everything is back at default condition. Only technicians know the coordination between the remote control and the key button.

Above solution is if you are very lucky, if not can be a loose wire dressing inside the TV itself.
Unlucky is the data board has to be replaced. Usually nowadays technicians replace the whole board so that no time is wasted to find the exact problem. So it should be OK for you.

Posted on Dec 08, 2013

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
  • 556 Answers

SOURCE: green color missing from my LG 700s model

as you are electronics engineer so let us discuss technically.

as you are unable to see green colour means you might be seeing picture of magenta colour

as technically

red+blue = magenta

crt has got three cathodes

your two cathodes circuit is fine one ckt that is green cathode circuit is not working.

for that problem your will have to check

  • cable from computer to monitor
  • loose contact in crt base.
  • crt connector loose
  • voltage on green video output.
  • green video output transistor might be defective.or print loose.
  • circuit related to green video ckt
  • green video signal coming to green video ckt.
  • & finally crt defective (in rare case.)
  • hope this will help
  • good luck.

 

 

Posted on Oct 18, 2007

jemmyrash
  • 180 Answers

SOURCE: LG 700E COLOUR CHANGES

you have touch up the solder point at the pict board. Because the solder joints dried up - lead poor contact.

Posted on Apr 22, 2008

  • 134 Answers

SOURCE: color problem

what?
What's wrong with it?

Posted on Oct 02, 2008

chinna_1977
  • 65 Answers

SOURCE: LG Monitor Display Problem

1. Mostly Loose contacts in video section that means CRT Neck board dry points checke it.
2.Pl check VGA Cable RGB signal pins 123 to ground 75 Ohms (on OK condition).
3.check 5v supply
4.check SDL and SCL signals.

Posted on Oct 06, 2008

  • 62 Answers

SOURCE: My studioworks 500G monitor LED blinking with twise colour(Green and Amber)and no display.

1. LOT problem.

2. Horizontal transistor bad.

3. Dry points in neck board, horizontal section.

4. transformer output capacitors problem.

5. IRF 630 ( lot supply fet )

Posted on Nov 03, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

No green and yellow colour


Hello
If you see the picture in yellow colour, means that there is no blue colour output from the video drive section in your tv, Yello is the mixtrure colour of red and green. Green is actualy there. blue colour is absent.
To detect this fault, you must open your tv. Just look in to the video output section, can be located at the picture tube base card, which is plughed into it diretly. See for any loose soldering points there. Check whether transisotors are used for red, green and blue output stages, or an Ic or three seperate Ics are used for this purpose. Anyway, blue catode of your picture tube pin gets a hig voltage, and so the blue emission is absent. You just check the voltages at red,gree and blue catodes, at the respective picture tube pins, which can be taken at picture tube base card. All of these three pin voltages must be somewhat equal to each other. In your case, no voltage at blue cathode will be higher that the other two. Check for the reason. It may be due to an open video output transistor [blue], or an Ic, of one Ic if used for the three colour outputs. Check and replace the same, will rectify your problem. Ok
If you have andy difficulty, get it to me through Fixya. Ok
Gopakumar, India.

Nov 21, 2010 | JVC AV-27230 27" TV

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

1 Answer

I have seen a problem in my tv is that there is no green colour display in crt. only two colour ( i.e. Red and Blue) or combination may be display. Pl. look into this matter , replay soon


Your problem may related to the green output or driver stage in your tv. Usually green calour is not tranmitted, only blue and red colour informatein are comming from transmitters. Green colour information is regenerated inside the tv by matrix network. If the matrix get damaged no green colour will be displayed. To check first; whether the TV colour picture tube's green gun is right or not. For that you must connect a resistor of value more than 470k 2W, to the green cathode of the picture tube base to earth. The connection should be done causiously, not for a long time. It is advised to do in intermittantly with just touches. When you touch the green cathode with the resistor with one side of it earthed, a green flash must come on the crt. You can do this test for red and blue too. If there is no green flash, or light picture tube may be faulty. It is a very rare case. You must check the volltages of the other two cathodes [red and blue]. The voltage at green cathode must be almost the same as other two.
Just check the green output transistor for open. If it is open, voltage at green cathode will be high. Also check the base voltge of the green output transistor. It should be around 2.5vDC. You can compare the base voltages of the other two transistors with green drive base voltage. If there is no base voltage, the fault should be in the matrix section. It is inside an Ic. Philips usually uses TDA series Ics in chroma section. Check the Ic pin voltages according to service manual and try to rectify the fault. It needs a technical knowledge and skill.

Oct 14, 2010 | Philips Magnavox 27MS343S 27" TV

1 Answer

ShubhangiWe try to connect CD player with Samsung LCD TV. CD Player is having Three Component Yellow, Red,White. It dont have Blue and green components.What to do ???


Hi, Component input connectors use the colour convention
Green = Y (luminance signal)
Red = Pr or Cr (Red colour difference signal)
Blue = Pb or Cb (Blue colour diffrence signal)

Composite input connectors use the colour convention
Yellow = CVBS (composite video, blanking, sync)
Red = Audio Right
White = Audio Left

for compatibility both units will need to have matching colours. note the component inputs do not have audio and as such will also have a set of red & white connectors for use with the audio signals too ( rule of thumb Component = 5 connectors, composite=3 connectors)

Sep 23, 2010 | Samsung Televison & Video

1 Answer

When using component cables(red, green, blue )


The series of the cable should go green red blue into the back. if you put the green in the red and the red into the green it give the TV a red base to go off of for the picture so everything is red. The reason the green cable won't is because it transmits a black and white picture which allows it a nice base to add the green and red to.

Feb 24, 2010 | Samsung HP-R5072 50 in. Plasma HDTV

1 Answer

XBox Audio Problems


The red, blue and green are ONLY the Video outputs, and connect colour to colour, now, there are Two other connections, again coulor to coulor, usually red & white, that hook up to the Stereo INPUT. So you need BOTH sets to work IE: The Video & Audio. Video: Blue, Red, Green. Audio: Red & White.

Jan 20, 2010 | Sony BRAVIA KDL-32S2000 32 in. LCD HDTV

1 Answer

Problem with a colour display on Hisense tv


If your picures are all purple it means that the green colour is missing. TV colour is made up by mixing Red, Green & Blue. Removing Green leaving Red & Blue makes purple. Study the green colour circuit for a fault and confirm that the green gun inside the tube is working.

Aug 31, 2009 | Hitachi 60SBX78B 60" Rear Projection...

3 Answers

LG 17'' LCD Monitor VGA 15 pin connector pin diagram


pin no 1 - Red colour signal (Red colour wire)
pin no 2 - Green colour signal (Green colour wire)
pin no 3 - Blue colour signal (Blue colour wire)
4&5 Not connected
pin no 6&7&8 are (Grounds)RGB Returns
9&10 NC
pin 13 Hohizontal sync signal
pin no 14 vertical sync signal
Not nessasry other pins

Nov 17, 2008 | LG Studioworks 700S 17" CRT Monitor

1 Answer

Green color missing from my LG 700s model


as you are electronics engineer so let us discuss technically.

as you are unable to see green colour means you might be seeing picture of magenta colour

as technically

red+blue = magenta

crt has got three cathodes

your two cathodes circuit is fine one ckt that is green cathode circuit is not working.

for that problem your will have to check

  • cable from computer to monitor
  • loose contact in crt base.
  • crt connector loose
  • voltage on green video output.
  • green video output transistor might be defective.or print loose.
  • circuit related to green video ckt
  • green video signal coming to green video ckt.
  • & finally crt defective (in rare case.)
  • hope this will help
  • good luck.

 

 

Oct 16, 2007 | LG Studioworks 700S 17" CRT Monitor

2 Answers

Color Problem:


in Monitor CRT Red-Blue-green cathode guns are there.. Mixing of these colour we can get the original colour chrominace technique. if any of the colour gun is faulty we would get more REad or blue or green picture. Measure RGB voltages. you can verfify which gun is faulty. if then check RGB processing circuits. Else there might be problem Chrominance colour decoder system. Contact service centre

Jan 09, 2007 | Samsung SyncMaster 551 15" CRT Monitor

Not finding what you are looking for?
LG Flatron L1951S 19" LCD Flat Panel Monitor Logo

82 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18394 Answers

Michael Vincent Cruz

Level 3 Expert

868 Answers

Are you a LG Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...