Question about Hitachi Performa CP-RS55 Multimedia Projector

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Screen when it is turned on the screen is blue,the picture is still there, its like all the other colours are gone, just leaving the blue? I am baffled and i can not find any help in the books that come with it Confused.... Any help would be greatfully accepted June Chandler Teachers Assistant at Ysgol y Ffin

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P.S. I also own a Hitachi LCD CP-RS55 my screen looks normal for the first 2 mins then as it gets warmer the screen get a blue blob or streak.. Then in about 10 mins the streak takes up half the screen image. I was told by a t.v. repair guy the lcd panels need replacement. However, These projectors are WAY outdated (things built a year ago are already a thing of the past)and to fix it would cost as much as a new one or a good used one.

Posted on Sep 14, 2007

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Sounds like you LCD has gone bad... Its like a calculator LCD when you press down on the screen of it it get like a blob. My projector also has done this... Half of the screen is all blue

Posted on Sep 14, 2007

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Posted on Jan 02, 2017

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2 Answers

HP vp17 screen is turned blue How to get back the colours?


I recommend you check the signal cable plug (from the monitor) is fully inserted into the PC.

Jun 10, 2014 | Computers & Internet

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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

1 Answer

The colour on my TV is a reddish colour. Have tried the colour adjustment. Skin colours in particular.


simple. easy. you have 3 screen adjustments. red green blue. turn color all the way down. you should then get just a black and white picture, but in your case, it will still be reddish. behind the speaker grill is an access panel for screen adjustment. remove speaker grill. remove access panel. you will see a block assembly roughly 6 inches square with 6 knobs on it. 3 are for screen, 3 are for focus. adjust until you have a black and white picture. then go into menu and turn your color back up. enjoy!

Nov 14, 2009 | Televison & Video

1 Answer

My ViewSonic TV suddenly stopped working. The


hi do you mean the colour flashing on the screen, if so it's gone in to screen burn mode try press menu on the remote, retune the tv, if this don't work get back to me with model number of the tv help you a bit more thanks

shaun

Jun 12, 2017 | Televison & Video

2 Answers

The picture is visible but there is an opaque blue area in the picture on the left side of the screen


Sony bravia

This blue is caused by magnetic fields. Either the speakers of tv is faulty or demagnatziser not working. Switch of tv and remove powercord from wallsockets. Leave for about 10 hours and plug in powercord and switch on. if demagnatiszr is working the blue will be gone. if not have youre tv demagnetized

If hometheatre or radio speakers are closer than ½ meter this could also generate coulouration of screen. move speakers further away. If tv is on and and being moved your static electricity can also cause this. So switch of if if you move your tv.

Aug 09, 2009 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

1 Answer

Bush RFT TV


The picture tube of the tv has 3 color in CRT Red, Green, Blue. The red cathodeof tv set has no function, its either the resistor become higt resistance, that why u need a repairman to replace it.

Apr 10, 2008 | Televison & Video

1 Answer

Colours on TV gone haywire


Can you post a picture of what your screen looks like? I may be able to help you if I can see whats going on in a photo.

Mar 29, 2008 | Televison & Video

2 Answers

Televison probs


Most tv's degauss themselves when turned on so turning off and on a few times might help. Leave about 15 minutes between on off cycles and keep on trying untill you see improvement. You could also get hold of an old tape eraser, plug that into the mains and starting from a foot or so away try to brush the badly coloured parts away without coming to close to the screen.

Jan 13, 2008 | Beko 324250WN 28" TV

1 Answer

Blue Tint


Most likely cause would be a loose solder connection that expands as the set warms up until it no longer makes a connection. You may get the blue to come and go by hitting the side of the cabinet after the set is warmed up awhile. (don't hurt your hand doing this, and don't keep doing it to "fix" the set. The connection will have to be located and repaired). Otherwise, there could be a component going bad, including the blue picture tube.

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1 Answer

Screen Gone "Yellowish" Colour, Appears that Blue colour is not working


your problem is in blue color cathode circuit. as you say that it becomes ok tha5t means 1 cable wire is loose from computer to monitor. 2 crt base loose. 3 loose contact in blue video ckt. 4 signal processor cable to crt board connector loose.(blue wire)

Oct 14, 2006 | LG Flatron F700B 17" CRT Monitor

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