coolant spill on pc board


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coolant spill on pc board

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omar6575
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May 7, 2007, 8:25 PM

Post #1 of 17 (413 views)
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coolant spill on pc board	Can't Post

i have a mitsubishi 65 inch model # ws-65869 some of the crt fluid spill on the pc board. i try to turn on the tv powers for about 5 seconds then shuts off, i clean the board how long does it take for the remain fluid to dry off complete. its been a day or so, i did notice when i turn on, it stays a bit longer then it shuts off. has any one had this problem, when i turn it on it looks as it wants to turn on. any help would be greatly apreciated

techchris
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May 8, 2007, 9:26 AM

Post #2 of 17 (400 views)
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Re: [omar6575] coolant spill on pc board [In reply to]	Can't Post

the fluid may have seeped under some ic's. its not usually just a case of cleaning off what you can see.also there is a possibility that some components have been destroyed on the pcb.

Torey83
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May 8, 2007, 2:22 PM

Post #3 of 17 (396 views)
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Re: [omar6575] coolant spill on pc board [In reply to]	Can't Post

The coolant will never dry. Its like antifreeze. Your best bet is to get the highest grade rubbing alcohol and a spray bottle. Completly soak the board where the CRT coolant spilt and let it dry. Repeat this multiple times. The rubbing alcohol will eat up the CRT coolant.

rrobor
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May 10, 2007, 4:13 AM

Post #4 of 17 (386 views)
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Re: [Torey83] coolant spill on pc board [In reply to]	Can't Post

You guys make me shiver, do you really know what you are dealing with. That CRT coolant is a carsenogen, its not as bad as asbestos dust but its not far short. You must take extreme care handling that stuff. And dont say it hasnt happened to me, it can take 20 years to get cancer. Its a bit worse than the silicone they used for breast implants and erection disfunction and that is banned now. So take care, having cancer in your later years is not a thing to look forward to, have grand kids instead.

Torey83
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May 10, 2007, 2:53 PM

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Re: [omar6575] coolant spill on pc board [In reply to]	Can't Post

Ethylene Glycol

ks6gp0
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Jun 11, 2007, 2:41 AM

Post #6 of 17 (342 views)
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Re: [Torey83] coolant spill on pc board [In reply to]	Can't Post

I also spilled coolant onto a board, but fortunatly I have not plugged the tv set in. What is the best way to discharge the high voltage before messing with the boards? Does all 3 CRT's have to have the high voltage discharge or just once? I have heard to just use a screw driver, but would like to be sure of what I am doing.

shadetree
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Jun 12, 2007, 7:56 PM

Post #7 of 17 (330 views)
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Re: [ks6gp0] coolant spill on pc board [In reply to]	Can't Post

you don't have to discharge projection crt's

bendavis2
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Jun 15, 2007, 2:39 PM

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Re: [shadetree] coolant spill on pc board [In reply to]	Can't Post

Typical TV coolant is 70% Ethylene Glycol and 30% Glycerin, or pure Ethylene Glycol.

Though potentially harmful, Ethylene Glycol is hardly carcinogenic. Here's the carginogen link: http://potency.berkeley.edu/chempages/ETHYLENE%20GLYCOL.html

Here is a data sheet showing health risks associated with being exposed to it: http://www.jtbaker.com/msds/englishhtml/E5125.htm

"Vapor inhalation is generally not a problem unless heated or misted." Really, as long as you aren't exposed to this stuff on a long-term repetitive basis, or ingesting it, you will be fine. As long as you handle it with respect, and can hold off from slathering it on your skin and rubbing it into your eyes, you will be fine. Comparing this to asbestos is ridiculous. http://des.nh.gov/factsheets/ehp/ard-ehp-12.htm

Seriously, disinformation like this is totally innapropriate. Like the TV repair guy that told me that I shouldn't change my own CRT coolant because contact with the liquid could kill me. High voltage....sure. But unless I start chugging the CRT fluid, the worst it can do is save me some money from repair guys who don't have a clue, and will lie for job security.

rrobor
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Jun 17, 2007, 5:00 AM

Post #9 of 17 (248 views)
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Re: [bendavis2] coolant spill on pc board [In reply to]	Can't Post

I have replied before and will reply again if need be. I was brought up at the start of this coolant with masks and gloves, and remain fixed in my opinion. Steak is a food, any charred meat is carsenogenic, Not greatly so but its not wise to eat charred meat. I suffered a type of cancer as a TV technician common to those dealing with carseogenic chemicals. Perhaps I am extreme but do you wish the treatments I have had. My point is simple I used the stuff, perhaps not as carefully as I should, I now take extreme care, missing organs in your body does not lead to an easier life, a little care may save you that. If I am incorrect my advice wont harm you, If he is incorrect his will.

bendavis2
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Jun 19, 2007, 12:03 PM

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Re: [rrobor] coolant spill on pc board [In reply to]	Can't Post

I don't disagree with the nature of handling the material. It should be done with great care. Wear gloves and a mask, work in a well ventilated room. Never come in contact with the coolant or it's vapors. Sure, those are all great ideas. I simply disagree with the practice of making up information to support your recommendations.

rrobor
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Jun 19, 2007, 9:51 PM

Post #11 of 17 (212 views)
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Re: [bendavis2] coolant spill on pc board [In reply to]	Can't Post

My advice comes from the teaching I was given, not from my whims or fancies. My teacher was an engineer within the employ of a multinational manufacturer. Now it may be that there are differing blends of the stuff and some are harmless, I dont know, but that my teaching at the advent of the introduction of coolant was as I state. Do you really wish to take risks with your health and that of others. the choice surely is simple.

rrobor
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Jun 21, 2007, 7:21 AM

Post #12 of 17 (186 views)
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Re: [rrobor] coolant spill on pc board [In reply to]	Can't Post

To add to my comment and after researching the subject more I find there are several forms of coolant used, that one may be safe could be correct, that another is a carsenogen is also correct. So which coolant are you changing, and are you correct.

onetech
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Jun 21, 2007, 12:21 PM

Post #13 of 17 (180 views)
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Re: [omar6575] coolant spill on pc board [In reply to]	Can't Post

The Mitsubishi sets do not use Ethylene Glycol in the CRTs they use a Silicone Gel. This gel will not dry or evaporate so you must clean it as best as you can. unfortunatly this Silicone attacks the copper tracing and the component pins. If there was a large area that was effected you may need to replace the circuit board if one is avaiable. The CRT is probably ok as the leakage normally doesn't effect the operation of the CRT. after the circuit board is repaired or replace you need to put a plastic shield under the CRTs to prevent any possible future leakage from getting on the circuit boards.

bendavis2
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Jun 21, 2007, 5:08 PM

Post #14 of 17 (173 views)
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Re: [onetech] coolant spill on pc board [In reply to]	Can't Post

onetech... that begs the question: Since most TV's seem to be prone to leakage, why don't the manufacturers compartmentalize the board away from the CRTs, or install a plastic shield in the first place to prevent such problems?
Would it be reasonable to do so prophylactically in my own TV just in case?

onetech
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Jun 21, 2007, 7:12 PM

Post #15 of 17 (171 views)
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Re: [bendavis2] coolant spill on pc board [In reply to]	Can't Post

In later models Mitsubishi did install a shield above the circuit boards to protect them from potential leakage and possible damage.
If your set doesn't have the shield in place it would be a very good idea to install one. The shield installed at the factory was a simple tray under the CRT assembly that went all the way accross above the circuit boards.

bendavis2
Novice

Jun 21, 2007, 7:55 PM

Post #16 of 17 (168 views)
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Re: [onetech] coolant spill on pc board [In reply to]	Can't Post

Does installing a tray like this after the fact cause any problems with overheating and/or proper ventilation inside the cabinet?
If not, I think I will definately spend the extra hour installing one to avoid what seems to be imminent (and costly) disaster.

onetech
User

Jun 21, 2007, 7:57 PM

Post #17 of 17 (167 views)
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Re: [bendavis2] coolant spill on pc board [In reply to]	Can't Post

No problems that I've heard of as the tray would be up closer to the bottom of the CRT assembly.

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