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Re: rolling and distorted picture
Projection sets have two very common problems.
The first common problem is convergence
These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.
When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others. You can get moreinformation and a DIY convergenece repair kit with instructions from the link below.
Here are some of the most common problems with these sets...
*Screen Looks 3-D *Colors wont align *Screen may look distorted or warped *No Audio/Video - TV Shuts down - May also make a constant chirping sound
Problem #2 - Another common problem is dull or washed out video.
Your set may have one or more of the following symptoms....
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Model listed here is rather old so first suspect would be bad solder connections on power board or elsewhere. Some of these are also prone to Glycol issues, coolant from the picture tubes leaks and gets onto a board and causes failures of almost any kind depending where it leaks.
The set will blank the 3 picture tubes but usually you will still have sound.
Another issue with these sets is GLYCOL which is a coolant much like anti-freeze but more concentrated and toxic that cools each of the tubes screens.
These sets had problems with it leaking from any of the 3 tubes down onto the boards---With speaker grill pulled off the front and the inspection plate behind it removed you from the front will see 3 large circuit boards.
The necks of the tubes are hanging down and the vertical circuit is on the middle board near the very front.
Some models if you look up the neck of the tubes will have a plastic tray to catch any Glycol--others do not-----those can get Glycol onto the boards.
Carefully look for any signs of liquid--does not need to be much and if you see signs DO NOT TOUCH IT WITH YOUR HANDS as it will be absorbed into your body and is very Toxic.
This is the reason many landfills will not accept this type of set.
The Glycol is a clear liquid not unlike mineral oil in appearance--anything it gets on gets shorted as it is conductive.
Again, looking from front (middle board a tan color and board to right is green---) the green board to right is signal and process board--if glycol there it will look tarnished where connections are or even a white residue on the board.
If no Glycol the vertical circuit is causing this.
If Glycol on the vertical circuit it can be removed with water and dried--then the real issue is what to do about the leak.
I have answers for that but you need to see if GLYCOL is your problem.
YOU HAVE TO LOOK VERY CAREFULLY FOR THE GLYCOL as it is easy even for someone like me who has seen hundreds of these sets with leaks to see sometimes.
I have had a few of these with similar symptoms. In one case the set had a coolant leak onto the circuit board. The way I found the problem was to unplug the power and removed the front cover.(most models you can remove speaker grill and access panel) Make sure power is unplugged. When I looked in using as much lighting as possible I was able to see small puddles of coolant that had dripped onto the circuit boards from the picture tubes above. The other one as I recall had an arcing picture tube which caused a screeching type sound seconds after plugging in, then it would go into protect mode and just have a blinking light. I'm sorry to say but in both cases it was deemed unrepairable due to expense or lack of parts. Although, in many other cases I was able to clean the leaks and circuitry to restore power. Keep in mind this is just an educated guess. Good Luck, Russmann.
Usually when I see this set with an unusual problem the first thing I do is to remove the front cover and look for coolant leaking onto the circuit board. The coolant is in a small chamber above each picture tube and sometimes the gaskets lose their seal and it begins to drip down onto the circuitry. Get a powerful light and inspect it closely for a few drips coming from the frame around the picture tubes and look for small puddles of goop on the boards. The only other common problem I run into on this set is convergence issues which usually cause a dead set or color alignment problems when set is on. I really think whoever looks will find coolant leaks. Good Luck, Russmann.
conversions are out....rca ... check for bad connections on circuit board around fryback xformer. check fuse by flyback xformer...fuse is shaped like a little plastic rectangle>>fuses should measure a SHORT when GOOD! Flyback Transformer is large in size and sends highvoltage to 3 picture tubes via a SPLITTER . easy to locate
First thing I do on these is to disconnect power cord,pull off the front speaker grill and remove the small door covering the tubes. Get a bright light and look for coolant leaking down from the metal shields that cover the high voltage anode on the picture tubes. There is a chamber on each tube that contains ethylene glycol or antifreeze to keep the tubes from overheating. Sometimes the gaskets get a leak and coolant drips down onto the circuit board. Look very closely at the board to see if there are any drips below the tubes. If this is the case you may consider replacing the set but some can be saved by cleaning the board and sealing the leaks. Have a pro look at the tv if this doesn't help because all you can get online is a guess. Second thing that could cause this is a failure in the vertical or convergence circuit that would entail part replacement at a cost of 200-300. If you find no coolant on the circuit board that means the convergence circuit or the vertical circuit needs to be rebuilt. These sets are known for having bad capacitors on the boards that eventually have to be replaced when a failure occurs. Good luck, Russmann.
The best way to clean it is to remove the board completely and wipe up as much as possible, then use qtips with rubbing alcohol to remove the left over residule the alcohol will dry quickly, but still allow the board to air day a full 24 hrs before reinstalling it in the TV.
I have seen this many times. There is a 9 volt regulator on the small signal board that causes this. The regulator goes bad and the 9 volts starts dropping, especially at start-up when the regulator is cold. If the voltage is below 8 volts then the picture gets dark and the vertical becomes unstable, with the picture squeezing down and/or rolling. As the regulator warms up the voltage starts rising back towards 9 volts and the symptoms start clearing up. There are 3 regulators in a row on the board and the regulator in the middle is always the bad one. Replacing that regulator should cure your problems but it should be replaced by someone experienced in servicing Mitsubishi projection TV's because pulling the chassis out is quite tricky.