I have a sony tv that goes on and then after a while the pic goes black. if i shut it off and turn back on its ok for awhile

Start simple by using different cables, whether they be HDMI, VGA or standard COAX cables. They could be losing the connection. Also, it's possible the power supply is wearing out and it gets too hot. You might want to simply try some spray air duster type thing to clear out any dust that can make it hot.

I would check to see if any capacitors have gone bad or are going bad.

Hello
Hello
It is due to some loose soldering points [dry soldering we say it technically], in the power supply section of the TV. Just check for it. Check the solderings of all components, that will heat up to an extent when the TV works on. Repeated heating and cooling may make solderings to the terminals of that components to get loose. Just resolder all the suspected solder terminals, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals. This must solve the problem to your tV. OK.

the lamp is coming to its end.. replace lamp

Don't know how I did it. Shut tv off and left it off for awhile put it it back on and picture and sound were OK. Thank you for your concern.

most likly its your lamp you just need to get a new one off the internet or you can bring it to a repair shop and they will be able to replace it for alittle bit more then the lamp itself will cost

DEAR fleming_pj
OPEN YOUR TV AND TRY TO RESOLDER ANY LOOSE CONTACT.
OR CHECK POWER SUPPLY UNIT .IT COULD FIX YOUR PROBLEM.
OK

I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.

when you say flickering??? are you saying the screen goes black and comes back on?? does the sound go out at the same time and comes bag on with the pic ? Is the sound there when this happens but is distorted. Is the pic blacked out or is it greying out with lines and twisting?? Need more info please as if its blacking out and the sound goes with it it may be going into shutdown. If the pic is getting kinda greyish with it twisting and the sound is there and ditorted then the tuner could be bad