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TV losing picture when cold; OK after 30 minutes

When cold, TV picture turns black, audio OK. Switching power OFF/ON restors picture for a while. After 30 minutes of operations all is OK.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 275 Answers

SOURCE: sony kv-32s26 32 inch tv

Could also be faulty Power supply. If Proper 110 V is not generetaed by SMPS, the above symptoms appear.

Posted on Sep 18, 2006

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  • 1 Answer

SOURCE: Power light flashing/ no picture

I have the same problem. The only way to get the TV to come on is to unplug it, but once you get it back on it turns itself off again in a few minutes.

Posted on Jul 19, 2007

  • 2 Answers

SOURCE: Samsung HLR5067W

Faulty lamp could be, there is also a little blue switch behind the lamp door that needs to be in the down position.

Posted on Nov 19, 2007

Adolph
  • 137 Answers

SOURCE: model LTV-27w2 westinghouse

The tv got a heat sensor, the only way to fix tv , if you are a tv tech, is to buy a bottle of "freez it" spray small sections of tv in side. It will be clearly where the fault is if you spray correct part that give trouble. Replace that part and Tv will be Ok.

Posted on Dec 22, 2007

Slinteriors
  • 8617 Answers

SOURCE: long warm up time

you have a bad capacitor in the deflection circuit.You will need some diagnosing and testing to find which one. An ESR meter will make short work of that but they are expensive meters.

Posted on Mar 22, 2008

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By the highly technical manner in which you set forth the problem, I can see you are far more electronically savy than am I, BUT just a thought: Is there there any sort of timer setting in the TV menu which may be cutting it on and/or off, and which you have somehow failed to notice? Good luck. . .

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My tv works OK except after switching on it takes 30 minutes before a picture arrives e.g. the green light flashes for 30 minutes before the picture comes on. Sometimes when the picture does arrive there...


There are two most common causes of this problem, and it's accross the board for all types of TVs: faulty electrolytic capacitors in the power board or BGA processor solder failure on the main board.

Of course there are other possibilities too, but those are the two most common ones in the order they occur.

What I'd do if I were you is to open and take a look at the power board for bulging capacitors.

Sometimes they're not on the power board - especially in small TVs like yours - but on the main board, so check there as well.

I'd be surprised if it's something else.

For a picture of bulged caps just google "bad electrolytic capacitor" or "bulged capacitor".

There are pictures in some of our blog articles too, but Internet certainly offers better ones.

Hope that helps.

www.coppelltvrepair.com

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Screen will not light up.standby/timer light blinks continuosly


check for any cold solder on the high voltage section of your tv A high voltage section is located at the power supply section, this is where the power cord is connected.resolder them,the horizontal section it is where the plyback transformer is located resolder them and the CRT board this is the boad that is attatched to the picture tube...good luck

please rate my help..

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After few minutes LCD picture went black but sound works ok


most likely the power inverter, also suspect the p/s. best to have a trained tech check it. Julio at milleniumtvsvc@gmail.com

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Sounds like power supply. Probably time for a new tv. You have already got almost 20 years service.

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Try to finde lose connection/ cold solder joint at board attached at end of picture tube. It seems heater/ filament voltage not being supplied to picture tube after a while and picture goes to black.

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Screen goes black after a few minutes, switching off and on and picture returns then goes black again


Hi,

I have problem with my monitor, it is automatically switching off and switching on for 2 to 3 minutes for every 15 minutes why ?

Please mail me the solution to craju1@yahoo.com





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1 Answer

Audio ok, but Video goes from color to black.


the tv turns on fine, but after 5 - 30 min or so, "sometimes MORE " the picture all of a sudden go's black. Sound is ok it is 100% loose contact problem. 1 please check for any connector or print for loose. 2 in signal processor ic there might be loose. remember there is no component failure.

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have a tech check your set for lose solder or possibly the audio circuit.good luck.

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There is no vertical card inside this set. Its the simple unexpensive vertical output iC. you most likly have a cold solder connectiion, on or about the flyback transformer, or video circuit in the TV set. Good Luck Please do not forget to rate this thread.

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