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Entire picture is red only how to solv to get normal picture

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Pls change the crt board

Posted on Apr 17, 2014

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Why does the picture get red horizontal lines across it and then goes to red tint over the entire screen? I still see the picture but it is all red. It is only 2yrs old


All monitors/TV's have Red, Green & Blue Drivers. When they are all on the screen = white. For some reason your red drive is over powering the others. Most of the time, it's a transistor or a failing capacitor depending on age .

Jun 12, 2014 | RCA 46 46LA45RQ LCD TV

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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

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My Mitsu rear-projection WS-B55 was purchased in '03 or so. Now the screen is sometimes turning red. I can do a system reset, and the color goes back to normal. Then it eventually (maybe days later)...


No,pictures go all red?Pictures have colors shaded shadows or 3D pictures look alike?Yes,than the tv it is developing a problem known as a convergence problems it dying.The tv convergence board have problems,must be resoldering those 2 or replaced 2 STK covergence ICS and some or all of it resistors too.To fixed the tv convergence board,to solved the convergence picture problems.The shop,will cost u like $300-350 for diagnose the problems and do all the resoldering work or replaces those parts on the tv convergence board.

Apr 08, 2011 | Mitsubishi WS-55809 55" Rear Projection...

2 Answers

Picture looks like hour glass.


You're probably talking about bad convergence. Probably Convergence power board. Only $20-$30 from encompassparts. com, if still available.

Apr 17, 2010 | Televison & Video

1 Answer

Blue vertical line at reght side of screen


This is normal. Depending on what you have connected to it the lines could be white, black and white specs, or green. Just mode will show the entire picture event the parts that aren't supposed to be seen. I would not recommend that setting. Full is the best mode if you want to see the entire picture in the correct ratio.

Apr 24, 2009 | Panasonic PT-56WX53 53" Rear Projection...

1 Answer

Green shadows around small red objects (football players with red shirts)


turn tv of by power point for 1 hour then switch back on that resets the picture if still happens may need a service

Jan 27, 2009 | RCA HD61LPW164 61" Rear Projection HDTV

1 Answer

Green/Blue distorted Colors


Color issues are harder to solve without seeing the problem. It sound like the red amplifier on the crt board is bad. Is there any red in the picture at all? If not, that will be you problem

Nov 26, 2008 | Televison & Video

1 Answer

Red tint on the entire picture


Always try your extended warranty!.....Probable cause = bad
red tube. One adjustment may help---turn down red screen
control, located behind technician access panel in front of set.

Nov 04, 2007 | Mitsubishi WT-42311 42" Rear Projection...

2 Answers

Very fine red lines across srceen


It is an adjustment, but it's an adjustment you may not want to do. It's the red screen control. It's located behind the front panel so the entire front panel has to be removed in order to access it-which will expose you to hazardous voltages. if you like, I can post detailed instructions on how to get that front panel off, it's kinda tricky.

Jun 13, 2007 | Sony KP-51WS500 51" Rear Projection...

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