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Projection T... Master
Re: picture tube gel leak
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.
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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.
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.
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.
Glycol leaks can be a problem. How bad is the leak is it dripping on the boards. This stuff that s leaking is called glycol conductive anc corrosive. keep the set upluged. The seals in the crts have failed. they would have to be replaced. Very involed repair. it involves removing the tube and removing the glycol removing the seal cleaning the tube replaceing the seal refilling the tube putting the tube back in and aligning. at the shop such a repair is about 2 to three hours..if THE GLYCOL has leaked on the board then the board could have been damaged. AT this point you have to ask if it is worth it. always get a profesional to do this type of repair. i dont say this often but this is not a fix it yourself
Well, it could be true that that is your problem, but see what kind of estimate they will give you for fixing it, a big tv like this will cost quite a bit to fix. You could attempt to fix it yourself but I don't want to be the one to tell you how as I don't want to be the reason if you should get hurt from working on this. If it costs too much to fix, then projection tvs are not for your parents and you should try something cheaper and get an lcd tv. Circuit city has a 32 in for under $500. Basically if the gel leaked all over the tv, it may cost quite a bit and this isn't fun for them or for you. If you have any other questions, let me know
YOU WOULD HAVE TO REPLACE THE COMPLETE RED PICTURE TUBE ASSEMBLY--THATS JUST THE START,,THERE ARE A LOT OF ADJUSTMENTS INVOLVED IN THIS JOB---ALSO THAT GEL OR FLUID,IF SPILLED ON THE CIRCUIT BOARDS WILL CAUSE EVEN MORE PROBLEMS---NEED A TECH FOR THIS ONE!!!!!!!!!
I am not aware of this model having the pip bypass procedure . Older models Yes . I have though seen some of these sets were the picture tube leaked onto the cicuit board causing this problem. With the tv unplugged and the back removed , Use a flash light and look at the board on the left to see if there is any liquid on this board . It is usually below the metal brackets where the picture tubes are mounted . Sometimes you can swipe your fingers on the under side and fill the fluid coolant . Then look right below that area and you'll see it on the board . Use paper towels to dry up well . Then plug back in to see if your problem is resolved. Now if it leaked that is telling me your seals are leaky and need to be replaced and coolant added to that picture tube that was the problem . This can be very tricky to do . If that was your problem call around to get your best price to repair your set without them telling you , you'll need to get the picture tube replaced . Good luck
If decide to do yourself, ya only have to do the green and blue ones, the red light spectrum won't allow fungal growth. Pull whole CRT assembly out to prevent spilled/leaking glycol from onto lower main boards
this model is famous for fluid leaks. each projector tube has a
reservoir on the front of it with a fluid in it. this keeps the face of
the tube cool. this depends on how bad the damage is in the tv. in most cases we can
reseal the tube and clean up the fluid 400-600. Once you take the tube out you will see where it leaked. The problem is that the frame on the CRT that the heavy screws with springs are mounted on (that hold the lens coupled to the CRT) is weak and they can bend. We have seen several that have leaked after the customer moved the set. You can only tighten them down so much because the frame bends. It is just stamped metal and not welded at the corners to support the bend.
We remove the CRT, clean it all up, add a very small amount of RTV sealer to the gasket, reassemble, let the RTV cure thoroughly and refill with coolant. The extra sealer should prevent future leaks. Haven't had a recall yet. Mits says replace the CRT...too costly.
You msut check the yokes carefully as well. If any coolant gets into them you can end up with shorts there and a mess.
Clean the boards carefully and repair any corrosion damage. The coolant is ethylene glycol and glycerine which is water soluable.