Today I turned my TV and was met with small white and black triangles, all over the screen. There was no picture but there was sound. I have had the TV since Nov, 2004 and have had no problems except for the inner mirror getting dust all the time. Prior to the triangles, I have had no warning sings that the TV was going out. Along with triangles, the green timer light continued blinking after I turned the TV off. I tried the reset button but that did not work. I unplugged my TV for a couple of hours and the green light began to blink again but then stopped after a minute. I then turned my TV on a again and the triangles were back. I have called a technician, they will come out next week.
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It appears that you may have a green drive issue. Try adjusting the Sreen Control it is located in the front of TV.
1) Remove Speaker Grill (it just pulls off) start at one end, 2) Remove cover (5-6 screws), 3) Adjust control. The control is located on lower right side towards bottom. A small black device with 2 rolls of controls, adjust the center control on bottom row counter clock wise, until you get a black and white picture.(adjust with color control to min).
If this does not work you light bulb (CRT) is bad about a $750.00 repair.
the easiest way is to turn the color all the way down to zero. Then notice the overall color of the screen, if it doesnt appear as a good black and white picture you will have to adjust the screens. To do that you have to remove the speaker grill cover and the small access panel, then depending on the chassis you will see a small square with 6 dials on it 3 on top and 3 on the bottom it will have screen stamped on it. adjust those 3 untill your screen appears the best black and white picture as possible. Now if your chassis only has 3 dials on the sgaure control box those are focusdont adjust them. . then the 3 CRT boards will have the dials you need adjust those for the best black and white picture. when your satisfied that you have a good black and white picture. then turn your color back up and adjust the tint.Let me know if you need more assistance.
Mitsubishi list this problem and has a solution of replacing several small surface mounted caps and diodes. we have tried this repair 5 times and only successfully done it once. so replacing what is called the formatter board part # 930B924002 for around $ 350.00 usually repairs this type of failure, However changing this board is a time consuming thing and takes a lot of Patience. It is buried deep in the set and several other board have to be removed just to get to it
This is the same problem as other posts have mentioned about the right side of the screen having a bluish-balck stripe down the side of the screen. Here's what's happening. There's a small light tunnel which has 4 very small mirrors located just behind the color wheel. The lamp shines light through the color wheel as it turns and the light goes through this small tunnel and is then relected off several mirrors before it is projected through the lens and onto the screen. Optoma apparently did not use a very good heat resistant expoxy glue when they assembled these mirrors and over time the mirrors drop down causing a shadow effect on the screen. It can be repaired without paying some repair shop a small fortune. Previous posts have a solution from another contributer whihc includes photos. I had to repair mine and it's worked fine since I used a decent expoxy to hold the mirrors.