I have a 1998 mitsubishi 50 inch rear projection big screen tv i purchased it used and it worked fine for about 5 hours then it went dead no power at all i then discovered the picture tube the blue one had been linking fluid on the middle circuit board and burnt a little brown thing i,m not sure what,s called but it,s brown with two prongs that is sordered to the board well one side of the little brown flat piece was burnt loose from the board i sordered it back and got power back and watched it about 2 more weeks it had a great picture sound and all but after that none of the buttons would work the tv such as power channel up or down buttons would not work the tv but it still had a good picture and sound but when i unpluged it it will not power back up no power at all help me help me
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Re: tv has no power and will not power up
First: Check the power outlet. Check it with a good lamp so you know you are getting power to the set. Secondly: Check the power cord. Wiggle it around the molded ends to make sure it is not open inside the molded portion of the plugs.
Thirdly: If you know for sure the set is getting power and still no indication at all (you should be getting some little light on the front panel; standby indication) then there may be a fuse on the back panel or just inside the back cover (you will have to remove it; after unplugging the power cord) that needs replaced.
Fourthly: After all these checks if you are getting nothing, you may have some failure inside that is very serious. Normally we do not recommend serious repairs to a set over 4 years of age. This is because the set is likely to develop some other problem soon after the repair is made; further, the repairs are getting more expensive day by day while the price of new sets is coming down dramatically. Lastly, the new sets have better picture, longer lasting circuits and better features.
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The power supply caps in the light engine power supply were faulty when they were installed. You need to remove the power supply and take it to your local electronics shop where they can remove the (7) faulty 1000uf 16v electrolytic capacitors and insert new ones. If you remove the power supply yourself (takes only a philips screwdriver) and reinstall it yourself, the electronics shop shouldn't charge you for more than an hour worth of time. The caps would be about $10. Here's a photograph (thanks Don Crawford).
Here's something that might also be useful. After you turn on
the set, and get the regular red blinky lights, hold down the Device
and Menu buttons together for about 5 seconds.
The Power light will start to flash in a two digit sequence.
I replaced the screen on my 62 inch big screen for about $50 and the picture is very good! You simply need to purchase a piece of plexiglass from a glass shop or hardware store and have it cut to the EXACT dimensions you require for your TV. NEXT the plexiglass must be FROSTED. This can be done by a fine particle sandblaster or power sander with a fine grade paper. I used a power sander and sanded BOTH sides methodically and vertically on BOTH sides. I recommend buying a couple of 12 inch wide strips to test which method pleases you most by placing them in the path of the projected image where the old screen was removed. In any event, I recommend frosting BOTH sides.