Re: Panasonic TCP50GT20
Figured I'd give a conclusion to this thread. I hooked the TV back up as it was yesterday and it was on for about 5.5 Hrs straight. The only spot that has any heat to is is by the A board. I think if someone wanted to add a dedicated fan to that board it would be benificial. The screen was much cooler to the touch and I could feel no heat increase around the PS,SS,SD boards. The fan mod made a Huge difference overall and was well worth the effort. The only change I would make to the mod would be to move the shroud down about 1/2" to 3/4" for a little...
rcpilot82
Member
Last Activity: 05-06-2021, 03:04 PM
Joined: 02-13-2013
Location: PA
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Re: Panasonic TCP50GT20
There are several stand-offs on the display for what may be a fan array as the location is correct, [I]However[/I], none of the standoffs are tapped. I did not want to go making metal chips in a fully assembled set.
I checked the clearances between the mounting supports and the back cover and there was more than enough room to do the fan shroud as I did it with no interference. FWIW, the back cover only contacts the mounting supports on the vertical portion. the angled sections have about 1/4" (6mm) clearance.Re: Panasonic...Leave a comment:
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Re: Panasonic TCP50GT20
Thanks,
I have been using a 50" LG plasma as a backup to this one while I fixed it. I can tell you the Panasonics gets MUCH hotter than the LG does. When the Panasonic was in service, you could get within a ft of it and feel the heat around it. The LG you have to touch it to feel any tempature change. Unfortunatly, for the LG, I feel that the Panasonic has a better quality display than the LG. I'll be putting the P-Sonic back into full service tonight....Leave a comment:
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Re: Panasonic TCP50GT20
Well, The fan mod works.
Below are several pictures of how it all came together. I used pop rivets to assemble everything so there is no drilling on the TV. I also used existing holes to mount everything.
assembling and mounting the fan shroud;
1. Cut out acrylic fan shroud, I had a junk piece of material and since this was not going to be a visable Mod. I used that.
2. Mount fans, I decided at the last minute to use 3 fans instead of 2 so that all the boards would get some air...Leave a comment:
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Re: Panasonic TCP50GT20
My concern with using a resistor was the heat factor. The fans I will be using are both 12v. and .17A rated (.34A for the pair) computer power supply fans. I ran them on a 6V NiMh pack last night and it seemed a bit too slow for my liking but was very quiet.
Output from PS: 15V
Fan voltage required: 8-10V
Voltage needs dropped: 5-7V
So given R=V/I,
R=5/.34=14.71 (15 ohm resistor)
R=7/.34=20.59 (21 ohm resistor)
Is my above thinking correct? I'll try the DC-DC for Grins N Giggles,...Leave a comment:
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Re: Panasonic TCP50GT20
Well, I ordered the power supplies, I got a 3 pack as I have other uses for them if the fan idea does not work out. Does anyone have any interest in seeing the fan mod I will be doing? If so, I'll do it and post more details about it. Otherwise I am just gonna get it done and put back together.Leave a comment:
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Re: Panasonic TCP50GT20
I came across this today:
[url]http://www.ebay.com/itm/1x-Power-Supply-DC-Adjustable-LM2596-Module-Step-Down-1-5v-35v-Output-Plugin-/261153219884?pt=LH_DefaultDomain_0&hash=item3ccdf1e52c[/url]
Do you guys think this would be a good solution to drop down the 15 volts from the PS? I have plenty of fans that are 12v and with this I could adjust the output voltage to keep the fans quiet. Good Idea??Re: Panasonic TCP50GT20<br /> <br /...cdf1e52c[/url]Leave a comment:
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Re: Panasonic TCP50GT20
Pics of Refurb. board...Leave a comment:
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Re: Panasonic TCP50GT20
Pics of BAD board....Leave a comment:
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Re: Panasonic TCP50GT20
OK, Looking at the service book I see 3 locations where there is a 15v output.
Connector Pin
P11 4
P25 1 and 2
P6 3
Should I not use any of these outputs? I assume the ground would be any of the mounting screws with the lugs on them? I Agree a 24V fan is the way to go to keep the noise down. I attached the PS layout for ref....Leave a comment:
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Re: Panasonic TCP50GT20
Lol, Yes you can. I can't get pics of the back side of the new board cause it is installed already. I'll try and snap some pics tonight.
Tom, While I have your attention, What are your thoughts about adding cooling and my ideas above? Do you have any input on voltage sources on the PS that can be used for fans? I can get 48VDC fans and 24VDC, 12VDC fans.
[url]http://www.mpja.com/48VDC-4-3_4in-X-1-1_4in-Server-Fan/productinfo/19005%20FN[/url]
I think 2 would be sufficent. I just need a power source...Last edited by rcpilot82; 02-20-2013, 10:03 AM.Leave a comment:
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Re: Panasonic TCP50GT20
Which board do yo want close ups on? the bad one or the good one?
Thanks for all the help guys
...
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Re: Panasonic TCP50GT20
IT'S ALIVE! Lol. All is good, I got a flashlight and got a close look at the connectors and was able to re-seat them all.
FWIW: the time on the unit is 4695:40 Hrs
NOW, is it worth doing a fan mod or should I just put the case back on?
Also, Upon inspection of the refurb. board from best-buy it was visable that the repair to this board was in the same location as my original board blew.Leave a comment:
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Re: Panasonic TCP50GT20
Well at least I didn't blow anything up...yet...
I'll go play and post back..
Thanks...Leave a comment:
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Re: Panasonic TCP50GT20
I replaced the SC board (5081AF)only. I removed the buffers to check them and thats it....Leave a comment:
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Re: Panasonic TCP50GT20
I reseated the ribbon cables and here is what I have....
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Re: Panasonic TCP50GT20
New board worked BUT now i have 2 horizontal black lines on the screen. They go the whole way across. Any ideas??Leave a comment:
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Re: Panasonic TCP50GT20
Yes I downloaded it but I only looked at it real quick. Fixing the blown board is not a top of the priority at the moment. Kinda going to be one of those things that I'll do when I get some free time....Leave a comment:
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Re: Panasonic TCP50GT20
So out of curiosity, are all the test points (TPxxx) supposed to be grounded on the SC board?Leave a comment:
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Re: Panasonic TCP50GT20
The paper I wrote everything down on shows pin 6 rising to open and 8 open....Leave a comment:
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