Question about RCA F27TF720 27" TV

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Set turns off, resets itself, turns on, repeats .

Off/on usally happens 3 to 5 times in the same pattern. Next time you watch tv it may not happen at all, or will happen 15minutes in or 1 hour in or whatever it wants. It was made sEPT 2002, started this cycling problem after one year of mild home use. No major move was involed.

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Re: set turns off, resets itself, turns on, repeats .

I think you might have a bad solder joint in the power supply circuit or a bad solder connection in the horizontal drive circuit. I've found a few RCA's that had a poor connection on a little inductor coil in the base circuit of the horizontal output transistor. A drop of solder cured this problem. Stargazer

Posted on Sep 02, 2007

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My sony has started turning itself off after 20-30 minutes, each time you turn it back on it will turn itself off after a shorter and shorter run time. Leave it over night and it will start the next day...

It might be over heating. If there is a lot of dust
inside of the back of the T.V. you should take it outside and blow it out with an air compressor.

good luck

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Problems with on/off button

Your Problem is the Hot transistor, it is short circuit. Causing the tv to go into protection. I f you say this is the second time the same problem tell the technician who works on the tv to replace all the caps on the collector of the Transistor and check the lopt transformer causing the HOT transisistor to fail thank you

May 16, 2009 | Philips 20PT91S 20" TV

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My mitsubishi tv model ws55908 will just turn itself off after I have been watching it. It could be as soon as 1 or two hours or 4. it does not happen all the time I can go a month without it happening...

This TV has a self diagnosis feature. When the set fails, push "menu" and "input": buttons at the same time and hold them in for more than 5 seconds. Watch the front panel light. It will blink two numbers five times. Get back to me with the numbers.

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Tv shuts off, when I turn tv on it will shut itself off, this hap

When it shuts don, the standby light should be blinking a repeated pattern. PLease update this with the count of blinks. That will indicate the circuit that caused the shutdown.


Feb 26, 2009 | Sony FD Trinitron WEGA KV-36FS120 36" TV

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TV shuts itself off

Mine does the same thing , too. I turn it on and off repeatedly , but nothing happens.I unplug it to see if it resets and nothing still .

Aug 02, 2008 | Mitsubishi WS-65908 TV

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Tv goes blank

The effect you described sounds a lot like a failed solder joint.

There are points on the circuit board that are subjected to heating and cooling each time the set is powered up, then down.
The solder joints near these areas can fail from metal fatigue as will any metal that is forced to expand and contract repeatedly.
These fractures are minute and can often only be seen under magnification.
Once found, they are simple to fix; removal of the old solder and resoldering will restore electrical contact in seconds.

If you can find a gray-haired tech nearby who is retired, maybe early since repair is a business stagnated by cheap labor in Asia, he/she will know where these areas are and can robably get rid of your lottery-like operation.
Or, if you have way too much time on your hands and are willing to buy a decent soldering iron and dig into the guts of your set, you can probably find the problem yourself.

While semiconductors do fail (sometimes for the same reason), since the set does sometimes restore itself, it isn't likely that any of those has died.

I would be torn to toss the set if it is otherwise OK for the simple reason that if repaired, it may outlast 80% of those bought in the last 2 years.
It is amazing the number of problems that are happening on new, sophisticated sets and it is traceable to lousy quality in parts and assembly.
I have one LCD set I will probably junk this year that is only 2 years old, flawed when I bought it new, and has a failure producing a vertical black stripe that would require replacment of the $4-500 panel.
Junk - Specifically, WALMART junk.

Jul 12, 2008 | Zenith B32A24Z 32" TV

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Mitsubishi CS-35313

If it is not a cold solder on the CRT board at the end of the tube (inside)...... then the CRT (tube) is bad. The CRT costs more than the set new.

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1 Answer

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

3 Answers

Sony KV-32HS510, worked perfect, turned on the next day and all I gat is flashing red light.

Your tv does not need a reset,what happened something went bad inside the set and it needs to be replaced,if you are familiar with tv service you can start by checking the horizontal output transistor for a short,if he went bad it likely made the fuse or safety resistor open.If you are not too familiar with tv service be safe and call for assistance froma servicer.If you decide to go in looking for problems make sure the set is not plug in.Let Us know how it goes or if you need more information.

Oct 19, 2006 | Sony FD Trinitron WEGA KV-32HS510 32" TV

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