Question about Mitsubishi WT-46809 46" Rear Projection Television

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Rainbow at the top and bottom of screen

Hi, I have a Mitsubishi 46 inch Big Screen HDTV (Model # WT-46809) that I just bought from someone. The display looks decent when viewing anything, but at the top and bottom of the screen there's a line that looks like a rainbow (red green, and blue I believe). You can somewhat notice it in the screen itself, but it's not too bad. It's just really noticeable on the top and bottom of the screeen where you can see the actual "rainbow" lines. Any ideas?

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Re: Rainbow at the top and bottom of screen

Thanks DJ,

I had the same problem with my TV, I had no electronic repair experience, and with your guide above was able to fix this on my own. However I did buy new IC convergence modules, but found out the the existing had a few cracked solder joints. I just resoldered them and works like new again.

Thanks Again

Posted on Aug 01, 2008

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Re: Rainbow at the top and bottom of screen - Mitsubishi WT-46809 46" Rear Projection Television Projection Televisions

Stick in the micro wave

Posted on Jul 09, 2008

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Re: Rainbow at the top and bottom of screen

I had the same problem. This is what I did: 1. Order the STK392-570 convergence IC and heat sink thermal transfer paste( I silicone based)..(make sure it is a reputable company so you don't risk getting bad components, I got them from an electronics supplier in MD) 2. UNPLUG YOUR TV AND ALL COMPONENTS!!!! 3. Remove the back cover and black plastic cover. (retain all parts) 4. remove the retaining bolts and screws on the black plastic tray (they are on the sides verticle mounted and front center as you are looking down on the tray.) This allows the tray to slide out like a keyboard on a computer desk. DONT PULL IT OUT YET!!!! 5. Just above the boards there is a shade board that slides out. Carefully pull it out. 6. You will have to unplug all cables ON THE BOARDS except for the RED ONES ON THE FAR RIGHT and provide tension relief for the cables by carefully unraveling them. The cables are marked on the connector and match to the markings on the board (I.E. KM, all connectors are marked with a two letter designation) Just disconnect the cables from all the boards and nothing elese. 7. Now carefully slide the tray about half way so you can see the contents of the entire center board. This is the board you need. Look in the back center of the board. There is a really large heat sink. The ICs are on the back side of this heat sink. They are held in place by a retaining bar that sandwiches the heat sink to the ICs. 8. There are some connectors on three sides of the board that are flat and white. CAREFULLY ....AND I MEAN CAREFULLY pull the left (as you are looking at board) ones up and disconnect from the center board. The ones on the right (I think they disconnect from the right board). 9. Unscrew the board from the plastic tray. There are a lot of them around the perimeter and center as well as the ones that hold the heat sink onto the board ( they also hold the board onto the tray.) You have to remove the "sandwich bar" (refer to 7)in order to get at the screws that hold the heat sink to board. (you have to unscrew them. 10. There is a box shaped cover on the left front part of this board that is screwed onto board and is also part of the retension to the plastic board, remove it to. (always remember to be careful when tugging, unscrewing, ect as it could result in breaking somthing) 11. There are black plastic tabs to the rear of the board. Unhook those and CAREFULLY lift and pivot the board forward and then up and out. 12. Now comes the easy part. You may have to pry the heat sink from the ICs carefully because of heat sink paste. Clean off the heat sink (dont use cleaner, just wipe the old grease off) 13. Use a good soldering iron (PACE, regulated, good desoldering iron) The temp just needs to be high enough to heat solder. 14. MAKE SURE YOU REMOVE THE CARD THAT WE TALKED ABOUT EARLIER that is in the front left of the board. You dont want it to break. Turn the board over so the chips are facing down. Take the desoldering tool and put it over the pins and in a circular motion until it heats the solder and push the sucker button. Do this to all of them that relate to the ICs. DONT KEEP IT TOO LONG ON BOARD. once you have done that to all pins, gentely tug on the chip wiggling it out. (carefully!!!!!) if you feel resistance desolder a little more. Make sure your desolder device is giving enough suction. 15. Now solder them back on and make sure you dont create any cold solder joints. This would be bad!!!! 16. Apply a decent amount of thermal heat transfer (grease, goo, ect) Make sure you do this or bad things will happen. You need this stuff. You can get it at radio shack. 17. Now put it back together and hurray you are done... Hope this helps... GOOD LUCK DJ

Posted on Jun 23, 2007

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Re: Rainbow at the top and bottom of screen

Yep, you have a typical convergence IC problem.. if you knopw how to work on tv sets and know how to solder you can change then ICs and adjust the set. But if you dont, this is not a job for you to do . Find a tech to assist you in this repair. good Luck

Posted on Aug 23, 2006

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Good Day, sam;
Sam it depends on "smudge".
If it's an oily type; then a mild soap, like dawn, on damp, warm soft cotton type cloth may remove it.
There are products found in most large best buy, circuit stores that sell a screen cleaner. It's sold in a small spay bottle, about 2-3 ounces. Always spray onto cloth NOT screen. Always wipe/clean with up & down strokes, NOT side to side or at an angle.
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