Question about Sharp 32C-240 32" TV

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Blue screen my tv's blue screen is always on. was looking at tv and it faded to blue although i still had audio. turned the tv off and back on again. there is a bluish picture and the picture begins to fade until it is completely blue!

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Re: blue screen

This problem is due to blue video circuit. 1 Please check supply to blue video ckt. 2 check crt base for loose. 3 check loose contact & parts related to blue cathode. 4 blue signal coming from processor to blue video. 5 processor it self. 6 at last if tv is very old than check crt also.(possibility is rear) hope this will help.

Posted on Oct 06, 2007

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Blue screen rca tv model 14f512t

you will have to take it in to get repaired. might of put a speaker or something megnatic near your tv.

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How do I turn off the tv speakers so that I may use surround sound?

Depending on the model TV, there may be a switch on the back to turn the speakers off, or there may a choice on the audio on-screen menu to turn them off. Not all sets allow you to turn the speakers off, but you can always mute the sound, although this sometimes leaves the word "MUTE" on the screen to remind you. You can also just turn the volume all the way down on the TV. If you're using the AV inputs on the TV with a device like a DVD player, another option is to connect the video only to the TV, and feed the audio to the amplifier providing surround sound. Then the TV speakers won't be used at all.

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White lines across screen and color faded.

Those lines are called vertical retrace lines. They appear when the G2 (screen) voltage is set too high, or when the video amplifier fails or lacks the high voltage supply (200v).

Have you got any electronics experience? You will need a multimeter and soldering skills.

If you do or know someone who does, take the set apart, look at the video amplifier IC (it is on the board at the back of the tube), get its model and download the datasheet. Find the pin that is labeled "high voltage supply" and with the set turned on measure it against the one that says "ground". You should have somewhere between 180-210v there. If that voltage reads zero or a very low value, the amplifier circuit is shorted or the power supply is not working properly. Unsolder the video amplifier and measure again, if the voltage comes up then buy a new amplifier IC, if it doesn't it's time to check the power supply. I believe you can find a service manual easily, follow the directions there.

Safety precautions: Do not under any circumstances touch the leads of any capacitors, and stay away from the big fat wire going to the top of the tube. Do not do anything inside the TV while it is plugged in (except measurements), and always use well-insulated tools. The high voltage section of the TV does not pose any health danger, however the shock it can give you will make you jump back, possibly into something sharp.

Jun 26, 2009 | Zenith C27A24T 27" TV

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Try unplugging for 36 hours. I had the same problem but with no sound and picture

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Portable Grundig TV/vcr combo - screen goes blue and then set switches off.

Hi mcloud Your problem is your video circuit.the component could be faulty or it has lose solder.have a tech look on your set for repairs.good luck.

Apr 25, 2007 | Grundig GF70-600 TV

1 Answer


Sounds like you have a problem with the blue gun in your picture tube or its drive circuit. You might remove the back cover and gently tap on the neck of the picture tube using a plastic screwdriver handle while watching the screen in a mirrow. If the picture flashes back on or on and off then the picture tube is the problem. If this is a projection tv you have three separate tubes : red, green & blue. you'd need to tap the blut one.Gently!!!! Stargazer

Feb 13, 2007 | Sony KP-53HS20 TV

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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.

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Sony KV-24FV12 Image intermittant Blackout

Hello Robert, the picture tube on your TV set is exausted. Please contact your nearest Authorized Sony Service for further help/advice. After all, Sony is a good choice. The next TV set you buy could be one of Sony-s Bravia LCD. Kind regards, Arpad

Dec 20, 2006 | Sony KV-24FV12 24" TV

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TV picture problems

this modle has a bad solder connection near the horizontal o/p transistor that causes the picture to fade in & out.the bad solder connection is on a small coil. the coil winding is typically red. looking at the back of the tv, the flyback has the rid wire going to the top of the tube, the horizontal o/p transistor is to the left & in font of the flyback, it's attached to an aluminum heatsink. directly in font of this heatsink is the coiul you are looking for, it should have a location id of L14XXX or L4XXX if I remember corectly. good luck.

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