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Josh C
Josh C, Technician
Category: TV
Satisfied Customers: 1055
Experience:  I have been an electronics technician for 17 years, Tv's VCR's, DVD players, home and car audio.
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I have a Mitsubishi Medallion HD 1080 series Big Screen TV.

Customer Question

I have a Mitsubishi Medallion HD 1080 series Big Screen TV. For the last week, it has periodic problems with the red being off focus. It will sometimes return to a good, clear picture on its own, or with a bump on the side of the TV. Also, it will sometimes shut itself off before turning on completely.That is, you push the power button, the light comes on, and sometimes you hear the screen coming to life, but then the light goes off. It sometimes will take five minutes to get it to stay on. Are the two problems related?
Submitted: 8 years ago.
Category: TV
Expert:  Josh C replied 8 years ago.
Welcome Ben!

Thanks for choosing JA!

I need a bit of information before we continue: <br /><br />What id the model # XXXXX the TV?

Are you familliar with Electronics repair at all, and can you solder, or do you know someone that can?

when the red goes off, does it look sort of like this?

I noticed you said the tv will straighten up when "bumped" this is good!

Get back to me and we will go from there..
Customer: replied 8 years ago.

Model #55411.


I am not familiar with electronics, and cannot solder. I may know someone who can.


No, it doesn't look like the link you sent. The reds are not lined up with other things, they sometimes shimmer, but nothing is curved as in the link.

Expert:  Josh C replied 8 years ago.
Ok, that sounds encouraging!

If you are capable, It sounds like the convergence section of your tv has developed some ring cracks around the solder joints on the Convergence IC's and possibly the Resistors.. This is a repair any competent tv repair person should be able to complete, and would usually cost 200-300 dollars.

If you can find someone who can solder, I can give them specific instructions!

The convergence I.C.'s are what "control" the picture..These IC's operate at a very high temp, and usually only last 4-5 years.

If you remove the back of the set, you will want to look for the BIGGEST heatsink in there - it will lok like a large aluminum block with fins, on that heatsink, you will see 2 lage IC's , probably STK392-110, or STK392-120's or something to that effect...regardless - you can Remove the board they are mounted on, and using a Solder sucker, or solder wick, remove the old solder and re-solder all the connections on the I.C.'s

Once you resolder the I.C.'s, you should test all the large resistors near them.. pull one side of the resistor out of the board so you can check it out of circuit. they will usually have the value in Ohms, printed directly on the resistor, but you may have to use the resistor color code to find out what value they are....However, usually if there is any damage, the resistor will look like it has been HOT or fried. resolder the IC's and replace any bad resistors, and you should be good to go. If you need to order a resistor or two,

Hope that helps!
Customer: replied 8 years ago.
Will this solve the problem of the TV not coming on?
Expert:  Josh C replied 8 years ago.
I cannot gaurantee it, but It should, because I believe what is happening is the TV is turning off to protect the convergence section when it "sees" an open circuit.
Customer: replied 8 years ago.
Sorry, but this answer is far too technical for me to know whether it's of value or not.
Expert:  Josh C replied 8 years ago.
Well, I cant really break it down into any simpler terms, If you have someone follow the instructions I posted, I know this will fix the tv - I have seen the same problem before in this particular set.

If you do not know anyone that can assist you with this, I would just suggest having a local shop perform the repair - for this type of repair you should be looking in the area of $200-$300.00 dollars I never charge more than $300 my self, even for in home service.