Question about Likom ViewMate LP995 (White) 19 in.CRT Conventional Monitor

3 Answers

Arcing around neck board

Likom ViewMate LP995 19 in. CRT several years old. Powers up OK, but hear "snap" and video drops until recharged, repeats. Took off cover, flash of arcing around neck board, not sure, but looks like might be arcing inside CRT tube's clear neck. Is it an over-voltage problem, or is the CRT tube bad, or...?? I have a HV probe good to 40kV, would it help to measure a voltage somewhere?

Posted by on

  • Ken Christensen
    Ken Christensen May 31, 2007

    As I remember, the arc-flash came from the white CRT socket at first (upper right picture). Inside this CRT socket is a dual spark-gap over-voltage (bottom picture) protection. I had disabled this spark-gap, thinking something had gone wrong with it (obviously not), and now it arcs in the tube (upper left). Do you maybe think that this is an over-voltage problem? If so, is there anything I can do?

  • Ken Christensen
    Ken Christensen May 31, 2007

    I should add that the monitor displays perfectly in-between the HV arcing, so there must still be a good vaccuum in the tube.

×

Ad

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 125 Answers

There is a crack in the neck of the tube and the vacuum inside is lost. There is already air inside the tube that is why the sparks are going to the pins. The TV must have been dropped or someone accidentally hit the neck of the tube

Posted on May 31, 2007

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 254 Answers

24 seven is probably dead on. CRT is likely gassy. While an overvoltage condition is possible, the overvoltage sense circuit should shut the Hi-volt circuit down, and you'd have no Hi-v or display at all. With the availability of good used monitors & flat screens, repair is not economical at all.

Posted on May 30, 2007

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 883 Answers

Sounds like bad crt if you saw arc inside glass...no economical fix-replace the monitor

Posted on May 30, 2007

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My Thomson TV 28WF401G is about 7 years old and has now started to automatically switch itself off after only a few minutes of being on. The red 'off' LED flashes several times, stops, flashes...


U have tools like a soldering Iron and roll of solders?Can u also do basic soldering works?Yes take the tv aparts and resolders the FBT-(flyback transformer) that the big block of plastic with a red wire with a black cap hook up to the tv CRT-(tv tube).Also the tv video board that the board that hook up to the tv CRT-(tv tube) tube neck hook on to this video board.Resolders that board too.70-80% will get the tv working again.

Aug 19, 2011 | Thomson 28VK25US TV

2 Answers

My Samsung 60 inch DLP TV turns its self off several times an hour. Eventually is stays on. What's the problem?


Hi,do you hear any strange noises? If you hear clicking or like wanting to turn on it could be the board that powers the lamp it's called the ballast.Here's the instructions to replace it :http://www.fixyourdlp.com/guides/samsung/bp47-00033a.php But if you don't hear any strange noises,tv is around 6000 hrs,2-4 yrs it could be time to replace the lamp.Have a bless one!

Apr 20, 2010 | Samsung Televison & Video

1 Answer

My TV was snapping or arcing then no picture at


Sorry to hear this. What has happened is that CRT coolant has leaked from one or more CRT's down onto the Main bd and or the Power Supply bds and shorted them. You must replaced ALL three CRT's and the shorted Main bd and or the Power Supply boards. Then a Full Convergence Alignment must be done by a very good and experienced tech. Not cheap.

Apr 04, 2010 | Samsung PCL545R 54" Rear Projection...

1 Answer

MY SONY DOESN'T WANT TO START..IT WILL SNAP TO TRY AND COME ON...THEN TURN OFF AFTER ABOUT 5 SECONDS..HELP?


The snap you hear is likely from the high voltage in the set. The worst case scenario is that the picture tube (CRT) is shorted and is arcing internally causing the set to shut down. There are other less expensive possibilities such as the flyback transformer which can also fail in such a way as to arc. You may be able to see through the top ventilation slots in back as you power the set. The neck of the tube extends back into the rear cabinet and you could possibly see a flash inside the tube neck if it is arcing. I would have to recommend you have a technician check this problem to diagnose it. The tube, if it is defective and out of warranty, would exceed the cost of replacing the TV. Check your warranty as the tube generally has a two year warranty and other parts one year with 90 days on labor.

Nov 12, 2009 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

TV POWERS UP WITH SOUND BUT NO PICTURE


Hey John I'm from Tas so not far away from you. If the sound is working the most common problem for a tv is that the voltage to the heaters on the tube is missing. Heat generally kills the caps on the neck board or further down in the supply. To verify this you can lift the back cover and have a look at the neck of the tube in a dark room you should see an orange glow inside the neck near the neck board. Hope this helps.

May 07, 2009 | Televison & Video

2 Answers

Replacing CRT neck socket after arcing problem.


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...

Jan 08, 2008 | Panasonic CT-32HXC14 32" TV

1 Answer

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..

Jan 08, 2008 | Panasonic CT-32HXC14 32" TV

1 Answer

Powers down after start up


over load on the power supply/poss. power/convergence or shorted video ic on the crt neck board.

Oct 03, 2007 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

Snapping sound


Could have a shorted gun, or a small crack in the neck of the crt

Nov 03, 2006 | Apple M6496 17" CRT Monitor

Not finding what you are looking for?
Likom ViewMate LP995 (White) 19 in.CRT Conventional Monitor Logo

257 people viewed this question

Ask a Question

Usually answered in minutes!

Top Likom Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18425 Answers

Alun Cox

Level 3 Expert

2678 Answers

David Payne
David Payne

Level 3 Expert

14162 Answers

Are you a Likom Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...