Question about GE 31GT740 31" TV

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Sound is fine but picture is black, is it a tube issue or possibly bulb?

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  • May 11, 2010

    Is the screen completely dark, no light at all? What happens if you press the menu button?

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Hi

maybe you have defective heating supply maybe the fusible resistor is blown thats why you have no picture at all..

Thanks!

Posted on Feb 25, 2009

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My tv was working fine and then it has gone black but still has sound and could change channels also connected to dvr and its a Sony tube tv ...yes its old but it was working perfect until this


The first thing to do is with back off turn set on and look carefully in the neck of the picture tube---you should see a filament (not unlike a light bulb but round and small (there are 3 filaments)

They are only 6.3 volts so will not be real bright but if none that is the problem.

Let me know if they are not lit and I will tell you what to look for.

Mar 23, 2012 | Standard (CRT) Televisions

1 Answer

Blurred picture


Is it a tube TV or a flatscreen? If it is a tube then it is possible to correct this, however I'm not sure what caused it. Take the back off the TV, and look for the flyback transformer. It is the unit with a red wire coming out of it, going to what looks like a suction cup on the tube. On the unit there should be a small knob labeled focus. Try adjusting this. If it is a flatscreen, sorry, I can't help.

Apr 14, 2010 | Sharp 27SC260 27" TV

2 Answers

Sony trinitron


check the heater as your tv is ON, there must be a yellow light at the rear of the CRT tube. If the heater is ok then check the IC jungle side. resoldering the leads sometimes will solve. If not refer to your local Tech.

Jul 31, 2009 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

T V blinks to black every few seconds otherwise works fine


Sony put i pic killer circut in there tvs. if the tube was not
giving the proper feed voltage on the guns in
the pic tube it blinks off ,sound good no pic.
if you turn up the brightness
on the flyback transfromer you can
get a little more life out of it ,

Jun 28, 2009 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

TV WENT BLACK WITH BUZZING/SOUND


hi the problem is the picture tube of ur television has got damaged.. its better to replace a new picture tube...

Jan 24, 2009 | Philips Magnavox 27MS343S 27" TV

1 Answer

Click click repeatedly faded then red blinking light


Go to the video menu and turn the color control to minimum. Determine if you have a black & white picture or is it green & white. If the picture is greenish, you have a problem in the screen circuit or possibly a bad picture tube. If the black & white is ok then I would suspect a problem in the chroma circuit such as a bad video jungle IC or a crystal. However, because your set had a red blinking issue prior to your existing condition I would lean towards the picture tube as the source or your troubles. You can try a simple test to determine if you have an intermittant short . Take the back off the set, and with the insulated end of your screw driver, very very lightly tap on the neck of the picture tube near the socket. If you see green flashes or hear loud snaps in conjunction with your taps or the green tint goes away, chances are the tube is the cause. If so, you might try installing an isolation transformer on the picture tube. Good luck

Nov 29, 2007 | Toshiba 36A61 36" TV

1 Answer

Sony kv35s66: No picture, just sound and red blinking


The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.

Nov 21, 2007 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Television has audio but a black screen


Bad technicians always say picture tube problem when the TV has black screen with sound. This a false statement and in some cases techniciacns use this to scare the owner or the charge a hefty amount. The truth is that picture tube outlast most component in the TV. If it will fail, it is gradual like the colors will fade or one or several color will be missing. This condition is the degration of the filament in the gun (CRT tv has three -Red, green , blue) I started to repair TV in the early 80's and only in one occasion that the Tube fail and it is a crack in the neck. For black screen with sound, the most common cause is the HV supply problem / Horizontal section. This can be caused by many things, like flyback transformer failure, horizontal outout transistor, horizontal drive, etc. For the cost-depends on where you are, in some countries labor is dirt cheap, in other ountries the parts are expensive.

May 22, 2007 | Mitsubishi CS-40505 TV

1 Answer

Picture doesn't come on


Is your screen black? If so then you may have a bad picture tube. I've seen this problem several times with SONYS. The thing seems to just open up and quit working.

Jan 09, 2007 | Sony KV-27S42 27" TV

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