Question about Mitsubishi WS-55805 55" Rear Projection Television

4 Answers

Turns Off the last thig that was occurring was that it would show a lot of random green spots of different sizes and shapes. This would go on for about half an hour before it turns off by itself. But it won't even show an image. I turn it on and the next second it turns off. A couple of years ago I call Anderson's TV repair and they came in a resoldered some of the pins, and it worked fine until yesterday. Do you think some other pins came loose now or is there a short circuit somewhere? Any assistance is greatly appreciated. Luis Diaz

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  • 3 more comments 
  • luisdiaz00 May 26, 2008

    This is great advice. Just tell me which is the convergence module and I'll check it out. Also do you think I should get a copy of the service manual to help out? If you think so, do you know where I can get a copy?

    Thanx again

  • luisdiaz00 May 29, 2008

    Can you tell me where the convergence module is . Also I know what a capacitor is and I know what a resistor is. i also know that capacitors hold charges. What I don't know is how to discharge the capacitor so I don't electrocute myself.
    I used one of the links on this web page and purhcased the training manual but I have yet to find the service manual. Do you know where I can find it?

    Thanx again

  • luisdiaz00 May 30, 2008

    Sorry IrishDruid, servicemanuals.vstore.ca does not carry the WS55805 service manual.

  • luisdiaz00 May 30, 2008

    Thanx jaime867, I ordered the service manual for the WS55805 from the website you mentioned www.completeservicemanuals.com. It did not give me an option to download, so I guess it will be mailed?

  • luisdiaz00 May 30, 2008

    IrishDruid, thanx for the info. I did have a TV technician come and look at the TV today. He charged me $60 to tell me it was the convergence IC and wanted $500 to replace it.

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4 Answers

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Hi there,

it is possible that some of parts need to be re soldered or you still need someone to check up the unit..


`jack

Posted on May 24, 2008

  • Elizabeth Krijt
    Elizabeth Krijt May 24, 2008

    Check for bad solder on
    convergence module. May have bad stk's. Do not neglect looking
    for bad solder on dsignal and defl boards. Mitsubishi is very prone
    to bad solder.

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It could be the convergence IC's that need replacement. It could also be a problem with the many capacitors/resistors around the IC's.
If you are confident enough to try a DIY, here is a good step by step guide with pics to assist you. But beware, if you have no prior experience, I wouldn't recommend opening the set, as there are voltages inside that can KILL.

I suggest you get a qualified service technician to take a look and get the TV fixed.

Posted on May 24, 2008

  • 3 more comments 
  • Swilin Sampson
    Swilin Sampson May 24, 2008

    The problem could also be with a failing power board. In any case, I recommend getting a qualified technician to take a look.

  • Swilin Sampson
    Swilin Sampson May 29, 2008

    You can get the service manual (and parts) from HERE.
    If you buy the manual from them, they will even provide online installation guide as you fix. Check it out..


  • Swilin Sampson
    Swilin Sampson May 30, 2008

    Click HERE for a detailed explanation of how to discharge a capacitor.
    Also, the convergence modules will be located on the heat sinks on the main board. Here is a pic of the modules on the heatsink:


    But once again , be VERY careful there is enough charge in a tv capacitor to kill you and will probably kill the capacitor (if it has a high enough capacity)
    due to the extremely high current flowing through it if you do that.
    The normal procedure is to connect both lead with an appropriate
    resistance. And not only once, because large capacitors can
    spontaneously rebuild some residual charge after being discharged
    (still enough to give you a serious shock). Normally both leads are
    connected through a fixed capacitor discharge bridge, which stays on
    the leads while working on the system. Once ready for testing, the
    bridges are removed.

    I would still recommend getting a TV technician to repair this.


  • Swilin Sampson
    Swilin Sampson May 30, 2008

    Sheesh! Well, take a look at the link I provided you earlier for a step by step guide on how to do this..and DO BE VERY CAREFUL.

    Also, as a precaution, better use an anti-static wrist band ( get them from any elctronics shop or radio Shack) and rubber boots. Also make sure you do not use magnetised screwdrivers, and dont touch any part of the circuitry unnecesarily..

    Also check for busted capacitors around the IC's. They are easy to identify, they will have a swollen cap. Here is a sample pic:

    The capacitors are usually 680-1000mf and 16-35V. I would recommend using 35 of 50V as replacements. They may a bit alrger, but will fit and last longer. Just check the capacitance value of the capacitor/s that need to be replaced (680-1000mF) and make sure this bit is correct. And here is a LINK to show you how to read the value of a resistor based on their color codes. Check with an Ohmeter to see that the reading of the resistors match the value of the color codes. If they dont, they are most likely faulty.

    Good luck with your repair!


  • Swilin Sampson
    Swilin Sampson May 30, 2008

    Also you make sure that the TV is unplugged from the AC socket for at leat 24-48 hours before you start any repairs, for the capacitors to discharge as much as possible..

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Do you see the colors like a 3D image?
If you do, then you have a convergence failure on your TV. Common failure on these TVs.

Posted on May 24, 2008

  • 1 more comment 
  • Jaime Hernandez May 24, 2008

    It might a DIY if you know how to solder and some basic use of a multimeter.

    This type of repair could cost you $300.00 to $ 400.00, if you do it yourself it will cost a lot less.

  • Jaime Hernandez May 29, 2008

    I could not find a place for a free download. You can visit this website and for about $8.00 you can get the complete service manual with all the parts listed.

  • Jaime Hernandez May 30, 2008

    You can send them an email to ask them how they will send you the service manual.

    Anyways, if you replace the parts yourself it will cost you a lot less money even paying the tech for telling you the problem on your TV. I mentioned that the convergence circuit failed in my post as well.

    Let me know if you need further assistance.

    Good Luck.

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  • 230 Answers

May be there will be some discontinuity in connections inside if you find it and soltered it the problem will be recovered

Posted on May 24, 2008

  • balachander megavarnam
    balachander megavarnam May 24, 2008

    the pins inside may got loosed because of that this will happen so check that

  • balachander megavarnam
    balachander megavarnam May 24, 2008

    or you need to replace the IC's that is not working

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