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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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Mitsubishi Picture Tube Leak
Read the posts. These sets have an inherent design tendency to do this when
moved. We have experimented with dud tubes in warranty jobs and can get them to leak with surprisingly small bumps on the frame supporting the coolant seal. The seem to stay sealed after that on tubes not used in sets. When run with thermal cycling in a set I am not sure because I have never been willing to risk putting one back in the field. Your years of experience notwithstanding, some of us have done dozens of repairs on these. As I said, your assumption that there is not a potential problem moving some RPTVs is a dangerous one. Any of the sets I mentioned, and some others from a variety of manufacturers, should be handled very carefully. Whether the problem is one for the movers insurance or for the maufacturer is a good one. I have a customer with that situation right now. We give our experience and honestly report on what we find to everyone concerned. Typically, my feeling is that the manufacturers need to step up due to the poor design. Generally, Mitsubishi has been very good about helping customers with these problems. I'm not sure about other manufacturers. I have heard very differing reports on most of the others. Leonard Caillouet "john" wrote in message .. . No Leo..!!! 36 yrs here in buisness having moved dozens and dozens of Pro sets in and out of houses. Sounds to me like somebody trying to Hit up an insurance company. kip -- "Watch the return E-Mail addy its false" "Leonard G. Caillouet" wrote in message . .. No magic, just observation, logic, and experience. Your statement "No way was it done in Moving" seemed to be based more on clairvoyance than any of the above. It suggested a simplistic view of these problems and a dangerous assumption. One must be much more careful with some RPTVs than people assume when moving them. I have seen quite a few Mitsubishis(VZ series chassis) and RCA (PTK195 chassis) that had coolant leaks shortly after being moved. Leonard Caillouet "john" wrote in message .. . Gee !! I wish I had your Magic Ball. kip -- "Watch the return E-Mail addy its false" "Leonard Caillouet" wrote in message news:L6_fb.40705$AH4.19236@lakeread06... "john" wrote in message .. . Maybe moving brought on the leaks which were already started but No way was it done in Moving... What a silly statement. Of course it was done in moving. That does not mean that the mover should necessarily be liable. The basic design is less than optimal. It would be more correct to say that moving brought on a leak, but that the integrity of the seal was marginal and anything that slightly jarred the CRTs would likely have had the same result. I have seen several of these that had no problems until they were moved, then when examined carefully the coolant had migrated completely from the tubes to a small spot on the board and corrosion had started. Sometimes you can't even find where it leaked from with the CRT removed. The basic problem is that the frame that holds the crt to the coolant chamber is too flexible to maintain even and sufficient pressure on the seal. Many never leak. All are marginally sealed. When we do one that Mitsubishi is paying for, we don't replace the tubes, we reseal them using a very thin film of RTV on both sides of the rubber gasket. I believe this to be a better seal than even a new tube from Mitsubishi. Leonard Caillouet |
#42
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Mitsubishi Picture Tube Leak
A magic ball isn't required.
Experience is. At our shop we do exactly as Leonard described and even take it one step further by adding a drip tray just under the CRT's. Similar to what Hitachi installs on it's sets from the factory. All it takes is a piece of plastic gutter down spout material cut lengthwise. Good Luck, Bill Jr "john" wrote in message .. . Gee !! I wish I had your Magic Ball. kip -- "Watch the return E-Mail addy its false" "Leonard Caillouet" wrote in message news:L6_fb.40705$AH4.19236@lakeread06... "john" wrote in message .. . Maybe moving brought on the leaks which were already started but No way was it done in Moving... What a silly statement. Of course it was done in moving. That does not mean that the mover should necessarily be liable. The basic design is less than optimal. It would be more correct to say that moving brought on a leak, but that the integrity of the seal was marginal and anything that slightly jarred the CRTs would likely have had the same result. I have seen several of these that had no problems until they were moved, then when examined carefully the coolant had migrated completely from the tubes to a small spot on the board and corrosion had started. Sometimes you can't even find where it leaked from with the CRT removed. The basic problem is that the frame that holds the crt to the coolant chamber is too flexible to maintain even and sufficient pressure on the seal. Many never leak. All are marginally sealed. When we do one that Mitsubishi is paying for, we don't replace the tubes, we reseal them using a very thin film of RTV on both sides of the rubber gasket. I believe this to be a better seal than even a new tube from Mitsubishi. Leonard Caillouet |
#43
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Mitsubishi Picture Tube Leak
A magic ball isn't required.
Experience is. At our shop we do exactly as Leonard described and even take it one step further by adding a drip tray just under the CRT's. Similar to what Hitachi installs on it's sets from the factory. All it takes is a piece of plastic gutter down spout material cut lengthwise. Good Luck, Bill Jr "john" wrote in message .. . Gee !! I wish I had your Magic Ball. kip -- "Watch the return E-Mail addy its false" "Leonard Caillouet" wrote in message news:L6_fb.40705$AH4.19236@lakeread06... "john" wrote in message .. . Maybe moving brought on the leaks which were already started but No way was it done in Moving... What a silly statement. Of course it was done in moving. That does not mean that the mover should necessarily be liable. The basic design is less than optimal. It would be more correct to say that moving brought on a leak, but that the integrity of the seal was marginal and anything that slightly jarred the CRTs would likely have had the same result. I have seen several of these that had no problems until they were moved, then when examined carefully the coolant had migrated completely from the tubes to a small spot on the board and corrosion had started. Sometimes you can't even find where it leaked from with the CRT removed. The basic problem is that the frame that holds the crt to the coolant chamber is too flexible to maintain even and sufficient pressure on the seal. Many never leak. All are marginally sealed. When we do one that Mitsubishi is paying for, we don't replace the tubes, we reseal them using a very thin film of RTV on both sides of the rubber gasket. I believe this to be a better seal than even a new tube from Mitsubishi. Leonard Caillouet |
#44
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Mitsubishi Picture Tube Leak
"Bill Jr" wrote in message om... A magic ball isn't required. Experience is. At our shop we do exactly as Leonard described and even take it one step further by adding a drip tray just under the CRT's. Similar to what Hitachi installs on it's sets from the factory. All it takes is a piece of plastic gutter down spout material cut lengthwise. Good Luck, Bill Jr It is amazing how so many of us come up with the same solutions. I have also begun putting a similar diversion channel in the sets to divert any potential leaks off of the board. BTW, glad you got to a resolution on your Zenith, Bill. Leonard Caillouet |
#45
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Mitsubishi Picture Tube Leak
"Bill Jr" wrote in message om... A magic ball isn't required. Experience is. At our shop we do exactly as Leonard described and even take it one step further by adding a drip tray just under the CRT's. Similar to what Hitachi installs on it's sets from the factory. All it takes is a piece of plastic gutter down spout material cut lengthwise. Good Luck, Bill Jr It is amazing how so many of us come up with the same solutions. I have also begun putting a similar diversion channel in the sets to divert any potential leaks off of the board. BTW, glad you got to a resolution on your Zenith, Bill. Leonard Caillouet |
#46
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Mitsubishi Picture Tube Leak
Leonard Caillouet
Thanks for everyone's help. I am still waiting to hear back from Mitsubishi, but they did call me for more information. So they are at least looking into it. I think it is great that a company truly stands behind the common problems and hope that they will help me out. As for the comment about "Why ask here?" Well, I didn't realize it was a common problem until I posted out here. Once I heard that, I started asking around and found that my brother's unit had the same issue. Thanks, Mark |
#47
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Mitsubishi Picture Tube Leak
Leonard Caillouet
Thanks for everyone's help. I am still waiting to hear back from Mitsubishi, but they did call me for more information. So they are at least looking into it. I think it is great that a company truly stands behind the common problems and hope that they will help me out. As for the comment about "Why ask here?" Well, I didn't realize it was a common problem until I posted out here. Once I heard that, I started asking around and found that my brother's unit had the same issue. Thanks, Mark |
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