mccullek
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Mar 2, 2011, 4:16 AM
Post #168 of 174
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Re: [hobodewey] Changing CRT Coolant
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Ok, there is a very easy way to do this. I have a phillips/magnavox PTV836 model projection set, and everything was working as always except for the fuzzy glowing picture that was now almost unwatchable. I was going to roll it out onto the street for the trash man, when I decided to check on line to see if it wasn't something minor, when I learned about the oil in the CRTs.
I opened my set from the front (there are some easy directions and pictures already posted earlier in this thread that show you exactly how to do this). Once I got the screen off, the three CRTs were sitting right there within easy reach. I did not have to do anything to the wiring, other than unplug the TV from the AC. By coming in from the front, there is no wiring at all and no chance of accidentally touching something that could give you a jolt. I simply removed 8 screws on each CRT. Four of the screws hold the CRT to the chasis, and once you remove them, you can then level up the CRT so that the gun is pointing straight up. You need to do this so that the oil does not run out when you remove the four screws that hold the outer lens in place. I used a small, but thick phone book and slid it underneath one side of the CRT until it was sitting level. Do not touch any other screws on your CRT except for these four or you may mess up your convergence.
Once I had the CRT leveled up and safely steadied with the phone book, I then removed the four screws that hold on the outer lens. Be careful here, because once those four come out, there is nothing holding the small colored concave lens and gasket in place (the coolant is under this concave lens). I pried on the lens edge gently and it came up revealing the cooling liquid. Have a roll of paper towels handy, and use one when you pick up the small lens, as it will have oil on it since it is concave and dips down into the coolant. Be careful not to spill or drip the coolant, as it will ruin your electronics inside the set if it drips on them.
I then used a large syringe rather than a turkey baster, as the syringe is airtight and will not leak. I took an old 2 liter drink bottle and placed the old liquid into it as I removed it from the CRTs. It took about 5 or 6 pulls to remove all the coolant, and then I cleaned everything out really well with paper towels and windex, including the concave shaped lens and the larger external lens. Rather than buy the CRT coolant oil, I went to the drug store and bought 3 bottles of baby oil for a total of about $7.00. Once everything was nice and clean, I filled the CRT to just below the top edge and replaced the concave and external lens, then replaced the 8 screws and the first one was complete. Do them one at a time from start to completion.
It took about 30 minutes to do the first CRT, because I was learning as I went, but I did the remaining two in about 15 mins each, as it was a simple repeat at that point. Once you reach the CRTs, it's really as easy as removing 8 screws, a clean up, then adding the oil, and returning the CRT and 8 screws to their original home. The hardest part is to insure you get each CRT level and steady, because if not, the fluid will spill out and ruin your TV. Also, make sure you don't over fill the CRT as the small internal colored lens is concave and curves downward into the coolant, so if you over fill it, it will spill out when you place the concave lens back into place. Very Important: Make sure you remove the four screws that hold the CRT to the chasis first and get the CRT level. If you remove the lens screws first, before leveling the CRT guns, the coolant will come rushing out and go everywhere inside your set.
Make sure you clean the mirror and the inside of your screen really well before you put everything back together. This entire job took me about an hour, and I really had no clue what I was doing other than reading this string of posts. I did have to adjust my convergence slightly, but that took about 5 mins tops. My TV is working great, and the picture looks as good as the day I brought it home new out of the box. Some have had some concern about using baby oil, but it's nothing more than mineral oil with fragrance. My set has been playing for a week with no problems and I have double checked it for leaks and so far, everything is sealed tight and the picture is fantastic! I got a brand new set for $7 and about an hour of my time. Anyone charging more than a $150 for this repair is robbing you!
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Re: [hobodewey] Changing CRT Coolant
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