Question about Philips Magnavox PPC936 36" TV

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Television when i turn on the tv the screen only works through the center of the tv about two or three inches tall, if i wait a few minutes and tap the tv at the bottom near the buttons with minimal force the screen will spread out and stay sometimes other times the tv will power itself off and the back on with the same screen problem. what can i do to fix this?

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Re: television

Check the whole board for possible cold solder and resoldered it!

Posted on Jan 16, 2007

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Hi I have a JVC 32 inch HD television. When I am on HDMI1 (freeview box in on) or HDMI2 (playstation is on) it will keep going to a blue screen every few minutes. How do I stop this from happening? I

Make a hard reset to this TV. Unplug it from AC mains wall socket. Wait for 5 minutes or so. Plug it again. If this do not help you, seek tech support.

May 29, 2012 | JVC Standard (CRT) Televisions

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I have a 22 inch AOC Envision LCD TV. When I first turn it on, only the top half of the screen displays picture while the bottom half is a gray/black color. If I wait about ten minutes or if I tap on the...

There is some loose solder terminals at the vertical scan output section at printed circuit board. If you are handy in electronic circuit boards, loacate the vertical output section, resolder all the suspected solder terminals there. This must surely rectify the problem to your TV.

May 18, 2012 | Standard (CRT) Televisions

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The tv keeps shutting off just after minutes of turning it on. We can wait about 5-10 min before turning it on again but then it only stays on for a few minutes.

This sounds like a heat related problem, which could be a faulty chip or a cold (bad) solder joint on one of the PCBs (printed circuit boards). Due to the lethal voltages present inside a CRT type television, it is strongly advised to have this repaired by a qualified technician. however, if you or someone you know is technically inclined, you can try to fix this yourself. Cold solder joints can often be spotted by visible cracks in the solder joints. a through inspection of all the boards could easily identify the problem which can be resolved with a quick tap with a soldering iron and perhaps a little extra solder added to the joint. if that yields nothing, another method is heat/cold stressing the boards while the TV is running. With the TV on, spray small areas of the PCBs with cold spray (or a can of compressed air duster turned upside down) until the tv shuts off. then heat the last sprayed part with a hot air gun (or a hair dryer) until you can get the problem to repeat regularly. inspect the area causing the problem and you will probably find the culprit.

May 26, 2009 | RCA TruFlat 27F520T 27" TV

1 Answer

Black box showing up in center of tv

your closed caption feature is turn on and in the text mode. either turn off the closed captions or change it from text to cc1

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Rear Projection TV Cuts out Need to wait and then turn back on?


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Standard CRT Toshiba TV - 4inch tall picture in middle of screen...



Not familiar with your actual model.

But a comon problem with older Tosh sets is the 2.2uf electrolytic caps from memory they are usually red there is 1 next to frame Ic & the second is near Psu.

Allso check frame o/p IC for dry solder joints this is easy to test for.

Tap the tv while it is on if the the frame suddenly pop to full size picture you know its dry joints so resolder frame IC.

Oct 13, 2007 | Standard (CRT) Televisions

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I'm about 90% sure it is the blue picture tube developing an intermittent heater to cathode short. I'm surprised the set isn't shutting down shortly after this happens. A service call will tell you for sure as it could also be a bad solder connection causing a similar symptom. My own procedure to check it out would be to GENTLY tap the neck of the suspected picture tube with a screwdriver handle to see if I could get it to come and go (Or get out my CRT tester and measure it with the power off). Obviously by holding the screwdriver blade you don't want to accidently short anything out as there is about 33,000 volts a few inches away from where I would be tapping. Nuff Said.

Feb 11, 2007 | Sony KP-53HS20 TV

2 Answers

36" CRT Toshiba has that vertical issue mentioned on here a bit

Your problem is most likely caused by a cold solder joint in the vertical circuit. Normally this is easy to find and correct. The problem will only get worse over time, but not likely for more damage to occur.

Sep 17, 2006 | Toshiba 36A41 36" TV

1 Answer

TV shuts off after few minutes

tap it on its side then try to turn it on and see if it stays on if it does bad solder connections

Aug 11, 2006 | Sanyo DS31520 31" TV

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