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No blue colour in t.v. 5yrs old, tube is very good

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  • goldmit Aug 26, 2008

    Mitsubishi WT-46805

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Possibly the Blue video output on the Blue CRT PCB is bad. Please reply to this same post with your model number and I will try to assist you.

Posted on Aug 01, 2008

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Posted on Jan 02, 2017

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What are signs of picture tube going?


Signs of a CRT going old, are bad focussing, unnatural colours and hues of a certain colour (red, green, or blue) if you watch black/white pictures. In colour pictures, black sequences also show hue.

Jun 13, 2014 | Panasonic CT-32SL14 32" TV

1 Answer

Blue lights standby only no channel open


please confirm brand and model number so I can assist you

Mar 12, 2012 | Televison & Video

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

1 Answer

I have Flat screen 14" monitor When I switch the power on the screen is blank but it changes through the four main colours and the Monitor power switch will not turn off . The Monitor is 5yrs old


It's not detecting the computer, Have you tried removing and reconnecting the vga cable usually has a blue tip on it with two screw looking apparatuses that twist.
try that first, second trouble is to check the video card.

Sep 14, 2010 | Dell Computers & Internet

1 Answer

Got a rainbow line in the middle is this the picture tube the tv is 5yrs apex tv


HI,

ITS NOT PICTURE TUBE PROBLEM ,,

ITS PROBLEM WITH COLOUR CAPACITORS WHICH INSIDE TV,,

APPROACH TECHNICIAN..


TNKS

RABBANEES

Nov 11, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Can't turn blue down, it overrides the other colours.


Conveergence is a huge problem here and if it overides the support your trying to give it it will be manually steered so it does not overide other colors.. You can do it carefully or can have a repair guy do it in about 30 mins or less good luck to you..

May 14, 2009 | Sony KP-57WV700 57" Rear Projection HDTV

1 Answer

I have a 32" sonya tv about 10 years old.... Have no red color any more.. Where can I get this fix and would it just be cheaper to go get a new tv.


tv producess three colours red, blue and green, each of this has a different input on the tube (crt)
each has a seperate path from the IC to the tube neck.
on the tube are three transistors, each one for one colour,these transistor can be tested individualy,
if all this does not work, then take your tv for rejuvanation (opening of gates on the tube in puts)

Apr 30, 2009 | Sanyo Televison & Video

1 Answer

Mitsubishi lamps


This set does have a lamp, it utilizes 3 picture tubes (red, green, blue) The tubes are not available as new any longer. It is recommended to replace all 3 after the reaches 5yrs of age because a new tube will over drive the others in brightness but it is possible to only replace the defective one. You can try Tritronics at 800-638-3328 for rebuilds.

Nov 11, 2008 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

Tv Screen Problems


as you see green screen with lines through it

lines you are seeing is called retrace lines.

the problem is due to green video output section failure

please check the followings as given

  • supply to green video output & video output itself
  • components in green video output circuit
  • crt base loose.
  • connector loose in video ckt.
  • signal from signal processor to  green video section is absent.

hope this will help.

good luck.

 

Oct 15, 2007 | Televison & Video

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Mitsubishi WS-65511 Rear Projection Big Box TV resets with a green flashing light every 5 minutes, Then works fine for 5 more minutes (perfect picture). Acts up worse when cold. Warm it up Works hours It's NOT the DM board caps. I've already replaced the DM caps twice. Not the problem. No repairman will look at the set. Too Old. So am I. I could repair it with help. The power supply must have a safety circuit that will shut down & reset if too much draw. I DON'T have a diagram. I'm not sure how to trace it . Which board? If I unplug boards one at a time, Will it damage other boards ? I know it is NOT the 7 DM board caps everyone keeps telling me. I see no burn't parts, No bulging caps. Tapping on components doesn't reset. What kind of component would act up when cold , But not overdraw when warm? This set has the best beautiful picture when it runs. If you can get past the resetting every 5 minutes for the first hour, You can watch it sometimes for 20 hours. I've left it on at night & it is still on the next morning. Change the channel Or raise the volume, And off it goes. Once or 10 times, Keeps resetting. Then on for 4 or more hours, Maybe. I can't afford a new one. It works GREAT ! when it works. I've notice that even when the set is turned off, The green light starts flashing (resetting itself while it's off) , Then stops. Once in a hundred times it will kick off the breaker & you need to push reset with a pin on the front panel next to the green light. It's probably a 10 cent resistor OR a $ 1.00 cap. If I only had someone with more knowledge than me to help. I know how to use a meter & read a schematic. I built a Heathkit 25"TV in the 70's & all my novice ham gear. I'm 64 & not familiar with digital circuits. Can someone help PLEASE ?

Dec 16, 2017 | Mitsubishi Televison & Video

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