Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks
I think you meant to say "panels" in that last line? Pans doesn't really get the point across, at least to me. Unless you use that word so much you needed a shorthand for it! Granted, you might have a point there...
Yes we have been seeing problems with that infernal glue they used in there, for decades on all sorts of electronics esp. amps. The older it is, the more chance there is that it is causing problems. Just gotta be careful when removing it to not sever a tiny run that might be under it....
mrbob84
Member
Last Activity: 08-13-2019, 02:09 PM
Joined: 07-27-2015
Location: San Lorenzo CA
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Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks
It has been nearly 3 years now since I took the caps out and left it be, she's been entertaining us ever since, nary a gliche anywhere. Not going further is definitely the key.
I would not just "snip them out" tho, as they are SMDs and you could snip something you didn't intend to, or even pull up a trace on the board. I'd desolder them out with tweezers or a dental pick. And VERY carefully, lest you bother anything surrounding them.
Remove them, DON'T replace them, wrap it up again...Last edited by mrbob84; 04-17-2018, 12:32 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Mit designed in a drip shed in the later models for this very reason. It's a rectangular open-top box made of nice thick plastic and gathers any drips before they can hit any boards.
A similar remedy I have used many times is to get a loose leaf separator made of flexible plastic and tape it - masking tape is best, it never gets gummy and lets go like other tapes - so that it will allow for ventilation while sheltering the board from any drips. Place it at a 45 degree angle above the boards with the bottom edge landing...Leave a comment:
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Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks
That's right. I checked it out and tho they look similar, they are definitely different. Nice catch, Terry!...Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
We are in uncharted territory here because I have never seen this done. It's an excellent idea though. I suspect that when enough fluid has leaked out it will level off and not leak anymore despite how much pressure is involved.
I'm sure this has happened many times to many sets and will not affect the picture to any noticeable degree if only a small amount has leaked out. I typically see a small air bubble at the top of most coolant chambers of the big expensive ceiling projectors. It's never enough to affect the look...Last edited by mrbob84; 08-19-2016, 09:51 AM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
If available at all. I am surprised as all get out that you found what you found!
If you are not having any problems with the blue, I would not remove its lens barrel. Usually any coolant leaks happen a lot sooner than now, your red one is really an anomaly. Best to leave well enough alone, I think.
Also, remember that anytime you remove and then put back any of the lens barrels, they don't go back EXACTLY where they were before, they require reconvergence of the cross hairs, or main pictures. Of course since...Last edited by mrbob84; 08-11-2016, 07:33 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Wow, I have never before seen an actual leak point, even tho I have dealt with this issue on countless occasions.
The coolant not only leaked, but corroded the plate as it followed gravity down.
Unless you want to remove the gun, sit it bolt upright, remove the red screws and gently lift off the coolant cover and remedy the leak - which is a very dicey project, not for the faint of heart - I would try super glue from the outside, yes.
Or this new stuff called [I]5 second bond[/I] might be even...Last edited by mrbob84; 08-11-2016, 04:06 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Those metal covers were not designed to stop the leaks, they are metal and IMHO are for shielding.
Mit eventually designed plastic collection bowls under the guns, but the earlier ones didn't have that.
I usually get a plastic sheet like a separator for a binder and rig it up to shed the coolant from over the boards. Allow a lot of room for ventilation from any heat sinks on the board, but a coolant shed is all you need, with its lowest point being away from the boards, so any drips will go onto the wood cabinet...Last edited by mrbob84; 08-10-2016, 10:40 AM.Leave a comment:
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Re: videos!
Try it and see. I am not a gamer....Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
.Last edited by mrbob84; 08-09-2016, 01:27 PM. Reason: (attempted delete, due to repetition in next post. No delete command found here)Leave a comment:
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Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks
It has now been a year since I performed this repair by removing the caps and not replacing them - see my posts here above from a year ago - and my set has been performing flawlessly ever since. We watch it all the time, and often my gf has it on all day during the summer here since she is a teacher. At which times we of course keep the contrast level super low to protect the phosphors. Then we crank it back up for prime time.
I would say that that confirms that simply removing the cap(s) in question will...Last edited by mrbob84; 08-09-2016, 12:48 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Awesome! When are you gonna have me over and play me a movie?
PS - Don't remember - have your optics been cleaned yet?Leave a comment:
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Re: cleaning and adjustment considerations
Yes, and I would also check out ebay. Why do you need that?
The parameters rarely changed year to year in the Mits line. You're probably safe assuming they have not changed, but always best to try new values out first, after very carefully recording the original values before changing any of them....Last edited by mrbob84; 07-28-2016, 09:02 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Well, motherboards for 'puters are usually multi-layer boards, where these are single layer. That really shouldn't matter, tho.
I think it would be OK, but I would shy away from actually using detergent. Some of it could get lodged in there and not rinsed off, causing electrolytic conduction later on with possibly the same corrosive results as you are having now. With just water, whatever doesn't get dislodged will just evaporate. I think i heard that too, along with the dishwasher recommendation, to also not use detergent....Last edited by mrbob84; 07-28-2016, 01:30 AM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
Absolutely! Hop on that puppy. For $38 shipped??? That shoulda been hopped on yesterday. As my daddy used to say, "Immediately if not sooner."
Keep in mind tho, that ribbon connectors connect boards. You are concentrating on one board. What about the other one, on the other side of that ribbon connector? The coolant splatter from coolant hitting the connector would go in both directions.Last edited by mrbob84; 07-27-2016, 09:52 AM.Leave a comment:
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Re: HDTV model clarification
Right. The partially conductive coolant is somewhere it should not be, causing that. Sometimes you can actually hear a splutter of conduction in this kind of scenario. It might have crawled under an IC, causing partial conductivity at many legs. Erratic, unpredictable operation is one of the characteristic signs of coolant invasion.
Ah, ending in 11, not 13. Makes it 3 years older than mine. If it does not have a DM module then you're right, the 4 or 7 caps do not factor in.
Luckily...Last edited by mrbob84; 07-26-2016, 02:55 PM.Leave a comment:
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Re: troubleshooting data 2
It is not uncommon for an unloaded power supply voltage to be significantly higher than when loaded properly. The voltage is left to simply float upwards, with no load to clamp it down properly.
Usually the case, however your model is only 2 years away from final model year for Mit CRT RPTVs. Mine was the final year, and it ends in 17. Yours ends in 13. Meaning 2 years before, as there were 2 numbers between model years. A fairly late model, not an early one.
As such your set would seem to have a DM...Last edited by mrbob84; 07-26-2016, 02:09 PM.Leave a comment:
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Re: stand-by
None of this other troubleshooting has had to be done when there is a coolant leak and I was on the phone with Mit - which I was many times in that era - it always came down to the board in question.
The more you poke around in there taking readings and such, the more risk you take on that your VOM's probe slips and hits something it should not hit. Connects 2 things it should not connect. Troubleshooting something like this should always be kept to the absolute minimum because of this. These sets are not for experimenters. One tried...Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
[]Last edited by mrbob84; 07-26-2016, 12:38 PM.Leave a comment:
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Re: Coolant Leak on Mitsubishi WS-A65 CRT RPTV
That kind of voltage fluctuation is definitely a sign that the coolant has spread farther than just that one connector. If it is the board beneath the red gun it's a brown one, with only 1 layer. Examine it again, using the bounce of a flashlight off the board and into your eyes. This will pick up the gleam of liquid more easily.
Remember, this fluid is not water, and when it drips it "plops" when delivered from a foot or 2 away, and thus has probably splattered elsewhere after bouncing off the connector. ...Last edited by mrbob84; 07-26-2016, 12:25 PM.Leave a comment:
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