Question about Standard (CRT) Televisions

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Picture flickers to blue screen.

I have an older Mitsubishi CRT TV, model CS-31MX1. The picture flickers between a nice picture and blue screen. It seems to improve somewhat as it warms up. I am curious what this is, how much it would be to fix (roughly) and if it is worth the fix.

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  • toobiloo Feb 28, 2009

    Thank you for the info, Len. I'm not an expert, but I don't think that is the problem, or at least not the whole problem. When the picture is on, it is great, a nice clean picture, then it flicks to a pure blue screen, the same blue screen that appears when you cycle through the inputs, or enter the menu. This happens continuously, flicking back and forth. It doesn't appear to be a problem with the picture tube itself because both the picture and the blue screen are very clear and crisp.

    - Tobias


  • toobiloo Feb 28, 2009

    Thank you for your help I appreciate the info. I googled a bit and found this about the same model tv:

    . TUNER VIDEO AND SOUND CYCLES BACK AND FORTH FROM CORRECT VIDEO AND
    SOUND TO SNOW. CHECK C713 (4.7UF NP 50V) ON MATRIX-PWB

    If there is a blue screen option in the customer menu it may be on and
    if it were off you may see snow instead of blue screen between video
    flashes.

    The thread is here: http://www.freelists.org/post/techassist...Not sure exactly what they are talking about, but seems to be some sort of capacitor? I that a hard thing to fix? I appreciate the input.


  • toobiloo Feb 28, 2009

    Len,
    Funny thing happened. I was testing it like you suggested. When I turned video mute off, the problem went away! No trip to the repair center, no need to buy a new TV. Thanks for your help.


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After a typical picture tube ages it gets a coating of chemicals (carbon, phosphor and various metals form heater filaments) on the red, green or blue electron guns. This degrades any one or all three guns over time. There is a process to "zap" or rejuvenate the picture tube. A "good" TV repair shop will have the device to do this. The cost should be between 1 to 2 hours of repair labor. That equates to $75 - $150. The only thing is that this process does not clean the guns effectively and they can "cake up" again. Think of it as a coronary cleaning, it does not mean the "plaque" can build back up. It will, and usually within 1 to 3 years depending on how old the unit is and how long it is on per day. The other alternative is replacing the picture tube. 2 - 3 hours of labor plus parts. An average picture tube (after technician's mark up) costs anywhere from $100 for 13'" set to thousands. Looking at your model, it's a 31". I would guess at $400 - $500 just for the picture tube. I like Mitsu's. A good machine. Right in line with Sony on up. (and better in a number of occasions I have seen) When the cost of the repair is over 50% of the cost of the unit, that's when I declare it replaceable at the hospital system where I worked. (Over 900 TVs) You should weigh the price too.
Hope this insight helps - Let me know if it did.
Len

Posted on Feb 27, 2009

  • Len Falk
    Len Falk Feb 28, 2009

    Thank you for your reply - Yes - I misconstrued - That is totaly different - That's the "Blue screen of no input". My question to you is - What is the source of your signal? Check your connections at the television and at your receiver box (Cable - Satellite - DVD) to the input jack of your TV. - Now it is a process of elimination to see what is causing the signal loss -
    Its usually caused by loose connections or bad connection fittings. Sometimes caused inadvertantly by haveing the TV jack in back pressed against the wall. This can cause damage to the cable, it's connection jack, and in extreme cases to the printed circuit board inside the television - Try those suggestions once - Sorry for the incorrect read the first time
    Len

  • Len Falk
    Len Falk Feb 28, 2009

    I saw Jim's post and not looking at the schematic the repair would be
    simple enough for me. I like to side with safety on the issue of CRT
    type tv sets as they hold a very high voltage potential. If your electronics knowledge is sufficient then yes, the part can be ordered easily at
    www.digikey.com
    follow his advice to set the menu for "Blue Screen OFF" options to see if that happens. (Second opinions are always welcome! :)
    If not, a TV technician should be able to repair it in an hour of labor time (see initial response) I hope this helps and thanks for the web link!
    Len


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