Question about RCA F26645 TV

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Rcs 26645, picture works great, sound is out. what needs to be changed?

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Possible audio amp.ic is shorted,please check you set up menu to make sure the speakers are turned on in the audio menu settings.

Posted on Mar 20, 2008

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My tv doesnt show anything some times othertimes it has lines running across and if i shake it and bang it long enough it will work properly for a while before it is off what can i do or what is the cause


dear sir,
i did'nt mension the model and brand of TV & also how long u r using that TV. as per your given explanation i think loose contact or dry soldering inside the TV circuit. so, u have to check carefully and resolder the circuit. but if u dont have any previous idea about this subject u must go to a qualified technical person.
hope u get the answer

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If it is just a collapsed picture and view as a white horizontal line across your screen. Loose vertical IC connection or is start ailing. Best is to reflux its pin with a new lead or resolder it.

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Nasty voltages may caught you.

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The power supply, and or one of the scan amplifiers has a problem.

I have serviced these for defective horizontal output transitors, and the flyback failing. When this happens, most of the time the power supply had to also be serviced. There are number of support components that can cause the failure in the first place.

The set will have to be serviced by an experienced service tech.

Jerry G.

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1 Answer

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If you are using any type of set top box weather it is a cable box or something along those lines, You are out of luck. The formating is controlled in whatever box is connected to tv. So to format the screen size keep this in mind. Cableboxes usually only let you adjust for 1080i and widescreen. But aspect is subjective to how they send the signal to you. Also make sure you hookup a HDTV cable box or I recommend Dish Network to this set because it is easy to operate the formating using the button on bottom left of remote. " * " STAR button is great. ALSO the DVR is larger and you can run the 2nd TV off the same box although it is Standard defination, the 2nd remote is very handy because it talks to the box via RF signals, which means no IR or line of site problems. Its awesome. If i can help you further. don't hesitate to email back. Thank you and have a good night. Jay

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1 Answer

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I think you had an arc in the high voltage circuit which zapped the blue drive circuit to the picture tube. This could have been caused by the high temperatures the your set was subjected to. Stargazer

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Sharp SX-59E9 Television, wont start.


The fact that the TV attempts to power by the green light accordingly, and then goes red, indicates that the x-ray protection circuit is shutting it down to prevent any further or more severe damage. You likely have a problem in the B+ (high voltage) line.. Could be anywhere along across one of several circuits but I'd first suspect the HOT (horizontal output transistor), HV regulator and then maybe vertical. There are several tests that need to be preformed and with the right equipment takes about an howr to complete. This is not something you can do yourself - I would assume you don't have the DMM, ESR and 20mHz scope for starters. But a good reputable shop can have this one back on it's feet in an hour and I would guess for under a hundred dollars... If you're not sure where to find a good reputable shop I would suggest going to NESDA's site and researching from there... http://www.nesda.com/locator/state_search.php Good Luck Bill

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Every time you put in that fuse and it sparks your probably causing more circuit damage as a fuse very very rarly goes bad for no reason.. Ok to the subject at hand. it you put back in a good fuse WITHOUT PLUGGING IN!! Next measure with an olm meter across the two legs on the plug on the end of the wire(the part you normally plug in.) Is there a short circuit?? yes? I would then start trouble shooting the front end of your main power supply like bridge recifyers,main b+ capacitor, the capacitor that goes across the ac line input as well as an VDR can short out in a surge. Now if that dosent get you anywhere your gonna need a schematic diagram. You can get that from howard sams photo facts. It available on line as a PDF for about 27.50. If you dont know what Im saying here then I really cant help you any farther and you will need to take the set to a quilified repair person as a tv even unplugged can hold 100's of volts. Now if you do know what your doing with solid state repairs by all means get the schematic and post it here for us to look at and we can assist you with this repair. Good Luck

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1 Answer

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typical problem with an older set. sounds like the crts starting to fade as manufactureres Im thinking build into a set faults that they know will happen after a certain time frame and most do this is why there are so many reoccouring falures in a tv sets life. this is simply my thoughts on this subject!! You could have your local tv guy shoot the tube (not with a gun!!) with a crt rejuvenator to maybe clean off the grids of the tube. sometimes this will help BUT its a risk also Sometimes it will ruin the picture tube also. I have a set that I rejuvenated the tube 4 years ago as it looked like crap but to this date s its stil looking good as it did when new!

Apr 01, 2006 | RCA F27645 27" TV

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