Question about Philips 20PT643R 20" TV

1 Answer

Picture Tube Failing


I've scoured the internet and have finally settled on submitting my issues in hopes of understanding my problem and maybe finding a solution. I own the below mentioned TV had have for at least 2-3 years, manufacture date on back is August 2004.

About 6 months ago I started to notice discoloration on the right side of the screen running vertically (red). Eventually on the Left side as well (green). I know this is a picture tube issue. Very small fridge magnets seem to help fix the picture slightly (and temporarily) when ran across the effected area. The set has never been dropped or otherwise mishandled. I don't believe any items near it would generate any kind of interference either.

I have continued to watch DVDs and play games on it with some mild visual discomfort. I just dealt with the issue until now. Occasionally the visual flickers slightly and seems to be adjusting itself, as if it was degaussing but then goes back to the discolored visual.

I guess I'm curious what could have caused this and if there is really anything that could be done to try and troubleshoot this issue before giving up on this set.


Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,175 Answers

I t sound like the De-gauss circuit has failed.
De-gauss demagnetizes the TV tube so you dont get what youre seeing.
It could be something as simple as a solder joint on one of the parts in that circuit. I fixed my Panasonic that way

Posted on Jan 27, 2009

1 Suggested Answer

  • 2 Answers

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

a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Our tv has been getting darker and darker - we've tried to adjust brightness in menu and have it set to far right but its still too dark. Is there another adjustment to brighten the picture other than...

In many many cases this is an indication of a failing picture tube. The gun assembly in the neck of the picture tube is shorting. There is a fix, but this is surely last resort and the final cure may not provide a fix. Picture tube rejuvenation is not always successful. I would certainly opt for a new TV. Thanks for asking, and show a few hands of support!

Mar 13, 2011 | JVC AV-27530 27" TV

1 Answer

When the tv is turned on, the picture does not come on immediately. The screen stays black and the red light on the front of the set will flash on and off. It could take up to 10 minutes for the picture...


It is due to your TVs picture tube base socket trouble. Base socket is one that connects the base card with the picutre tube pins. You can locate it at the base end of the picture tube, soldered on to a printed circuit board, and pluged to it. It can be detached from the picture tube neck alongwith that printed circuit board by applying a slight backward pull. Be cacious not to shake the board sideways of upwards or downwards, as it may damage the picture tube pins. Just pull it straight backward. A little pressure may have to be applied sometimes.
After detaching it, look at the wire connections to that base socket. Note it, and resolder it out from the board. Go for a new one of same type. Look keenly to the pin confuguration of the new one with the orginal. Buy one with made up of super quality material. Replacing it will solve your problem. OK.

Jan 02, 2011 | Toshiba 32A32 32" TV

1 Answer

Sony trinitron television , when you turn on it takes awhile for the picture to come up on screen and when it does the screen constantly blinks

Three possibilities
First it sounds like your Tube EHT ( Extra High Tension) power supply is failing.
CRT TVs need a high voltage around 30K for the tube to work. Whcih is generated in the set, if you hear clicking sound like arcking this will confirm it. Unless you are familiar with HV electronics you should not attempt to fix it since it can be dangerous.
Second possibility is the picture tube is failing.
Third possibility is there is some problem with the video circuits, to check this try connecting a VCR or a DVD to see if the picture is OK. If it is, the problem is in the video circuits.

Feb 15, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

I can not find the remote for my 32" Sony trinitron can I manual make any changes. It is a tube set

I think the best thing to do is purchase a replacement remote such as universal.

All instructions are with it , and if you read below that will help you understand.
Hope i`ve helped.

Dec 04, 2009 | Sony FD Trinitron WEGA KV-32HS510 32" TV

2 Answers

Color displays in rainbow effect

Remove any speakers or electronic items that are near the set.

Jun 27, 2008 | Televison & Video

1 Answer


I suspect you crt tube is going and is most likely not worth fixing

There are things you could do a tv service shop could rejuve your picture tube and adjust your screen voltage.

sometimes that does not work

I would start looking for another tv

thanks doctor video

Apr 14, 2008 | Sony FD Trinitron WEGA KV-36XBR800 36" TV

1 Answer

Curtis mathis 1982 model

Hi there!
It is probably the tube failing. Not a fault you can fix yourself without the right equipment and knowledge. Some repairers do have what they call a "Tube Booster". Fairly inexpensive to have done but not always successful. There is however a chance of burning the guns while boosting, so please do not hold anyone responsible for that. It will have to be done at your own risk or a new TV. Good luck, JUS004

Feb 28, 2008 | Curtis-Mathis CM32010 TV

2 Answers

No pictureq

maybe you have defective heater line tru the CRT board! check the heater line if have a 4.5 volts or 4.8 volts! can you see the back of picture tube!?! they lights coming out at the neck of the tube! if no light! you have defective heater supply!

Oct 16, 2007 | Orion1934 19" TV

1 Answer

Tv Flashes

Your TV has a bad picture tube = no reasonable repair possible......time to go shopping!....................T.

Your TV has a bad pix tube + a blown power supply!!
Time to move on ........T.

Aug 25, 2007 | Sony KV-35S42 35" TV

Not finding what you are looking for?
Philips 20PT643R 20" TV Logo

131 people viewed this question

Ask a Question

Usually answered in minutes!

Top Philips Televison & Video Experts

The Knight
The Knight

Level 3 Expert

69845 Answers

matt martin
matt martin

Level 3 Expert

1198 Answers

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Are you a Philips Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides