Question about Panasonic CT-32HXC14 32" TV

2 Answers

Replacing CRT neck socket after arcing problem.

Hi, see below for more info, I am trying to find a parts source for this plastic socket guide. it is the piece that fits on the end of the CRT to protect the glass end and support the pins, it also aligns the neck board socket so it goes on correctly. also, is moisture likely to build up on the neck of the CRT? I live in the southwest US where its normally pretty dry, seems odd that moisture would collect inside the set. I still plan on getting the service manual for the set and verifying all the neck voltages etc. don't want to repair it and have it arc again because I overlooked something. Also, if you know the actual industry term for this part so I can search the web for a replacement that would help too. If you need photos ans measurements of the part let me know. Thanks posted by wastric on Jan 08, 2008 Report abuse

there is a random arcing between the pins of the crt neck connection on my CT-32HXC14J, worse on power up , gets less as it warms up. I have isolated it to under the plastic alignment cap that fits over the end of the CRT and its pins. After carefully cutting thru the sealant that holds the plastic cap to the CRT neck and cleaning off as much of the charred and blackened sealant as possible, the arcing has gone away. I need 2 things, 1 what should I check that might have caused it to start arcing, i.e. B+ too high, bias off, loose ground etc. and 2. whats the best way to clean off the glass around the pins to reduce the chance of re arcing? should I use some corona dope coating as well? Thanks
Comment by wastric, posted on Jan 08, 2008 I hope thats all that caused it. anyone know where I can buy a replacement CRT base socket , there was no arcing on the neck board socket half so its good to go. I really don't want to leave it without that socket piece. it makes sure the neck board goes on correctly, and helps support the weight so the crt pins are not carrying all the weight. Its been a long time since I worked in consumer electronics so any ideas about a parts supplier that can get me that plastic socket end/guide would be great. I can post a photo and take measurements of it. Is it a generic part or unique for every make of TV?

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chrispurs1
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Rating: 82%, 121 votes

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  • 3 more comments 
  • William Strickland
    William Strickland Jan 10, 2008

    I have ordered the socket base from Panasonic. as far as your other question, yes I am sure it was arcing outside the CRT, I tested it in a dark room and was able to see it was above the back layer of glass at the end of the neck. after removing the old crt base socket and cleaning off alot of the RTV silicone adhesive used to hold on the socket( that showed signs of arcing i.e. carbon traces etc. ), I put the neck board back on and turned on the set. no more arcing was seen. before it was very bad right when you turned on the set, after letting it run for about 5 min. without arcing I turned it off and went to work trying to get more of the adhesive off. still alot left but will have it cleaned off by the time the part gets here.

  • William Strickland
    William Strickland Jan 17, 2008

    bad news, the part I ordered turned out to be the socket that is soldered onto the neck board, not the CRT end. Panasonic checked and the part I need is not available, so I have to find another way to fix this. any ideas? I have no problem with ordering the part from Asia or Europe if its for sale there. I am going to identify the CRT manufacturer and see if I can order it from them. they must use this same crt end on more than just one crt.

  • William Strickland
    William Strickland Jan 18, 2008

    I will take a photo tonight when I have time to open up the set. I don't need the socket that solders to the neck board, I need the plastic end cover that protects the CRT glass nipple and gives extra support to the pins of the crt as well as helps align the neck board socket when you are plugging on the neck board. this plastic cap/support/alignment guide is held onto the end of the neck of the CRT with white silicone sealant/adhesive.it has holes in it to go over the pins and a center cap area that protects the glass nipple that sticks out between the pins. the arcing happened between the pins of the crt right along the outside of the glass,it arced thru this adhesive, the adhesive and the plastic cap are slightly charred with carbon from the arcing. I am in the process of cleaning off all the adhesive and plan on cleaning the glass with alcohol and a synthetic scrubber to prevent scratching of the glass, but getting all the carbon off. then I want to spray the glass surface with red corona preventing spray coating. I am worried tho that if I don't replace the plastic cap, the residual carbon imbedded in it will cause future arcing. my next step will be to identify the CRT manufacturer and try to contact them about a replacement CRT end cap. any ideas would be very helpful. the tv still arcs every once and a while, but getting the charred adhesive off reduced it greatly.

  • William Strickland
    William Strickland Jan 20, 2008

    here are some photos of the part I need

  • William Strickland
    William Strickland Feb 13, 2008

    I actually saw the arcing happening under this plastic cap between the pins of the CRT. it arced enough that it caused charring of the underside of this cap and of the silicone adhesive that bonded the cap to the end of the CRT. once I removed the cap and cleaned up the adhesive, the arcing stopped. I still have the replacement crt neck board socket. altho the arcing was happening clearly at the very end of the crt itself, not inside the neck board socket, I might still swap out the socket since its too much of a pain to send it back to Panasonic. once I put the plastic cap back on the neck of the crt, it would randomly arc every once and a while, I think the carbon build up impregnated the plastic and allows it to arc when the cap is re installed. I can not find a source for the cap so I plan on cleaning it as well as I can, then coating it with anti arc spray coating before re installing it.hopefully this will be enough to stop the arc path.

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If anyone is looking for a solution to this problem my CRT tv was arcing as well. I disassembled the white socket that the crt plugs into which is on the neck board and found a TON of corrosion making it hard for electricity to pass through the connections. I cleaned them as best as i could and the set quit arcing. I figure the excess energy it couldn't pass through the contacts arced to the next pin over.

Posted on Mar 12, 2010

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  • 372 Answers

Hi.

Don't know what happened to the last post I sent you its disappeared.

What I think you should do is definately replace the CRT white socket (tube base plug).
You can either take the CRT number from the label on the tube & put it in to google then search for Crt base plug.
Or see if there is A repair shop local to you who can order the tube base for you.
Are you definately sure the arcing is external to tube & not happening in the tube neck ?
Is the CRT made by LG / PHILIPS. These are notorius for for arcing over internally I must write at least 1 A week off for this problem.

If you can still run the set try tapping the neck of tube with screwdriver handle if pic flashes or goes predominately1 colour you are looking at the tube with internal short.

If this is the case there are ways of trying to get rid of the internal short let me know what you find ?

http://dysonmanuals.llc.nu/

Chris...

Posted on Jan 09, 2008

  • chris pursloe
    chris pursloe Jan 18, 2008

    Hi



    Im A bit confused by your last post.

    The plug you need is the one with approx 8 holes to go over pins protruding from the tube neck & solders to rectangular pcb.

    But I think im right saying this is what panasonic sent you & thats not what you require.



    Can you post A picture of what you are after.



    http://dysonmanuals.llc.nu/



    Chris.

  • chris pursloe
    chris pursloe Feb 12, 2008

    Hi.



    I have looked at the pictures this socket will not cause any problems with arcing.

    You need to replace the plug that connects crt to the pcb I think you said you ordered this part & sent it back.

    If you desolder the old plug from the crt pcb & cut it open you will see that it has been arcing internally.

    They do break down its very common in some sets.



    http://dysonmanuals.llc.nu/



    Chris.

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chrispurs1
  • 372 Answers

SOURCE: Arcing between pins on CRT

Hi.

Your problem is due to moisture in the the Crt base socket you will need to replace the white plastic crt plug I have tried to clean & dry them out but it never fully corrects problem.

As far as the pins & glass crt neck goes clean them with Isopropyl alcohol this will thoroughly clean all the carbon off.

http://dysonmanuals.llc.nu/

Chris..

Posted on Jan 08, 2008

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Hi.

Your problem is due to moisture in the the Crt base socket you will need to replace the white plastic crt plug I have tried to clean & dry them out but it never fully corrects problem.

As far as the pins & glass crt neck goes clean them with Isopropyl alcohol this will thoroughly clean all the carbon off.

http://dysonmanuals.llc.nu/

Chris..

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