Question about Quasar SP-2719 27" TV

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No picture but have sound

Picture may appear for a minute or two and then the screen goes dark. Sound remains okay with dark screen.

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Re: No picture but have sound

Solder any / all bad connections , esp. vertical output IC......

Posted on Nov 07, 2007

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Tv problem

Check its horizontal output section circuit for any loose solder terminals. Resolder all suspected solder terminals by applying little more fresh solder. Replace the horizontal output transistor. If this transistor have some leak, it will overheat within minutes will shut down the picture.

May 26, 2012 | RCA 27F530T 27" TV

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Screen goes black but sound okay

Visit this site for more details. Type in the site name "Electro-help" either Google or Yahoo search box [not in the address bar of your browser], and click search. It is an electronic equipments service help site. All details you want are there. Note the position of hyphen in between words in site name, when you type it in. The site will appear as it is in web; subtitled as electronics equipments' repair help.

Pull up older posts. You can gather all details. Sometimes, click open the adverts' by the side and bottom of each post might give you more details.

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When initially turned on TV will alternat between picutre & black

When the tv goes to a black screen does the sound remain on? Also,if you listen carefully can you hear any arcing noises in the back of the tv?

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Too dark sony model kv21gmr1

Warning: The following procedures should be done by an expert.
1.First step is to check the physical condition of the set.Before starting troubleshooting try to resolder the board and find any cold or loss solder.Then after plug the set and see if the filament of the tube glows.If not the trouble is in heater circuit.
2.After seeing the filament if it glows, check the CRT socket and open it.If you can see a sign of terminal decay such as greenish unwanted element on terminal surface,replace the CRT socket.
3.If replacement does remedy the problem check RGB drivers and resolder or replace jungle IC.
4.Try also to adjust the screen adjustment found in the flyback transformer.
5.Another possible cause is the vertical IC.Adjust the screen to full and see if their is a white horizontal line on the screen.If so the problem isin vertical circuit.

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sounds like a dry joint ,probably on the tube base causing the crt heater voltage to fail .easy repair job..farr64

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HT transistor, or rectfying diode from chopper transformer is blown.

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1 Answer

Picture problem

Usually that symptom is caused by cracked solder joints on the vertical output IC. As the IC starts heating up, the picture starts breaking up at the top with several "dancing" dark lines appearing, the top scrunches down and then when the vertical quits altogether, the screen goes completely black. A good slap on the side of the TV might make it happen faster or clear it up temporarily. If you have experience working on PC boards then you can resolder the pins of the vertical output IC but if you have never soldered parts on PC boards then allow a qualified tech to handle it for you.

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