Question about Hitachi 50V500 50 in. HD-Ready LCD Television

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No Color Blue

It appears that I have no color blue in my picture. Is this a lamp issue or is it a convergence issue.

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Re: No Color Blue

The symptom is not an indication of a convergence problem,straight forward the blue is missing,the pictute tube is not firing up or the color driver are not active and the blue color is not being processed,check the blue picture tube to see if is on sometimes you can see all three gunds from the side of the set.You should seek assistance from a professional to diagnose the problem.

Posted on Oct 02, 2006

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I have a toshiba tp50h50 rear projection tv and their is a blue shadow behind the words and makes the words a little blurry

Sounds like you need to do a color convergence. If you still have the owner's manual, it will give great detail on how to do this. The convergence menu is accessed from the video menu on the tv.
The tv has three color picture tubes, red, blue and green. The convergence alignment adjust each tube so that color from each tube overlaps each over to create a white image on the screen. Most tv's only allow you to adjust the blue and red colors.
Convergence should be performed each time the tv is moved and at least once annually.

May 16, 2011 | Flat Panel Televisions

2 Answers

Color issue

download this manual
see page 59,60,61,62. The problem can be the lamp
After extended use, if the TV picture turns dark, the color looks unusual or LAMP INDICATOR light turns on, then it
is time to replace the lamp with a new lamp.

Mar 21, 2008 | Hitachi 50V720 Television

1 Answer

Green convergence goes into oscillation

green color appear in tv screen indicate the red and blue color failed, it may need to be check by a tech its inside the tv already

Feb 08, 2011 | Flat Panel Televisions

1 Answer

I replaced the bulb on the unit and still have a blue spot on the screen of my Panasonic MODEL PT-52LCX35

most likely needs to be manually adjusted

manual convergence should fix the problem if it does not the set most likely either has a bulb burnt out or a bulbs power / focus needs to be adjusted by taking off the panel and finding a 6 screw control panel


should look like that 3 screws in a row on top of another three screws each of thees control the power and focus of each color this is a somewhat delicate process and is a huge pain on larger tvs that you cannot completely see the picture or color while you are directly under in front of it so I had my gf come in the room and sit across to let me know which color was doing what if you dont have someone you will need to check after each adjustment

now the diagnostic
as i said each screw controls a colors power and focus the focus is used if you see an outline of a color around pictures if everyone looks like a dead jedi with a blue aura around them the blue focus needs to be adjusted and so on for each color if you skies or blue screens seem feint your blue power probably needs to be turned up and so on for each color

if through the course of this you can see the bulbs and notice one is out your probably looking at dealing with the color issue until the time you can purchase a new tv as the cost of the bulb and the technician needed to install it as they are wired to a circuit board and requires technical knowledge and tools

hope this helped

Apr 29, 2010 | Flat Panel Televisions

1 Answer


Was the TV working before you changed the lamp out?

The motor that runs the color wheel may have gone bad and that's why you only are seeing one color.
A/V Media Tech Guy

Nov 25, 2009 | Flat Panel Televisions

1 Answer

Blue streaks and faint blue blotches on screen

The Optical Block / Light Engine is the problem. Very expensive repair / over $1000

Aug 08, 2009 | Sony KDF-42WE655 Television

1 Answer

Red, blue and green dots appear on screen like snow

ask ur service provider and ask him to change ur revolution or ask him to change ur sreen

May 21, 2009 | Philips 42PF5331 42 in. Plasma Television

1 Answer

No red color


what do you have hooked to the set?
How is it hooked to the set?
does this happen on all inputs?

Jun 24, 2008 | Sony KDF-E50A10 50 in. LCD HDTV

1 Answer

Componet 1 and WII

First of all, make sure that you have the colors of the component cable matched correctly. You can switch the Pr and Pb cable and still get a picture although in the wrong color.

Secondly, go to the TV menu... the menu should still be in color. If it is in B/W then you might have a hardware issue. Try adjusting the custom color setting so that you get a blue picture or red picture. There is an option for adjusting the color called "blue mute" it should give you a perfectly blue picture. If you still don't get any color than it is a hardware issue. It could be the Main Board or the Control Board.

It was the Main Board in my case.

Oct 07, 2007 | Akai PDP4206EA Television

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