Picture blacking in and out.It happens after the tv gets warm

Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---

Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.

Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.

Try unplugging for 2 mins. Or press power button for 30 seconds. Your Light in the tv might be shot.... happens every 5 or so years.
GOOD LUCK
CNBY

This also happened to me and may continue to get worse... If it goes away for a while after warming up, then it is the same problem... The LCD panel is probably going out, when that happens the cost to repair it is more than the tv is worth... If it is in warranty then you can have it replaced or fixed.

What model and brand is your television?
Is it a CRT type or DLP?
If picture is getting smaller then larger, and its a crt rear projection television sound like you have bad connections around the Flyback transformer and or horizontal circuits. This usually happens when a connection is made on the circuit board and the picture returns to normal especially during a cold start, but as the television warms up the connections on the board start to seperate and the problem starts occuring or it could be in the reverse process. Unstable at first then when tv gets warm it make better connections. All in all have a technician check the HV section of your deflection board.

Most likely there are electrolytic capacitors in the power supply, video path, and scan amplifiers that are starting to fail from age. This is common in many of these sets. In consideration of the age of the set, this may not be worth having it serviced.

Jerry G.

Most likely this is caused by the failure of the inverter for the high voltage required by the backlight, 2nd most likely is the failure of the fluorescent backlight itself.

at a month old you dont want to be poking around in it so try and take it back, But if you want to take it apart?? try the gpu panel as it is the screen that is getting the problem try using the model number on the board to find a replacement., as these get really hot that could have caused the problem. Or you could leave it on a picture with no input going to it for about 15 mins and see what happens if it does not do it then it might be something else, but whilst trying this the tv can warm up.. then try a picture and see if wi works with the tv warmed up.

It's your power supply. have it taken care of ASAP before damage happens on the board where it can't be repaired, just replaced, "if they can find one".

this is usually due to bad ground check cable line comming into tv and
CHECK/RESOLDER CONNECTIONS IN TUNER WHERE CASING IS SOLDERED TO PCB NEAR 4TH FEED THRU BACK FROM ANTENNA INPUT