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This is probably due to dry solders in the power supply area of the tv... next time when it powers off give it a whack on the side and see if will just light up for a moment.. If it doesn't just open the tv and check for dry solders, loose contacts and faulty capacitors.. PS:I would not task some one without experience in electronics to handle this one. This shouldn't cost you much even if you hire a tech anyway..
I had the same problem with mine turning off after 3-5 seconds. After much research I found a suggestion that on some combo units the vcr part could have a power supply cutout if it is not working correctly. I tried to insert a tape and found that the tape mechanism would not accept a tape. I used a little bit of force and managed to insert a tape. I then played the tape forwards and backwards and the power stayed on! I ejected the tape and found the TV then worked just fine. The power has now been on for over one hour. I hope this give you another avenue to try and fix your problem.
if all you want to do is disable the vcr portion turn the set on , install a blank vhs tape it has to be blank or the vcr will try to read it .and the tv and dvd should work fine. this is a timing problem in the vcr deck its not hard to fix but it is a pain.
First thing to check would be L401. Its a small coil from the secondary side of the horizontal driver transformer to the Base of the horizontal output transistor. Not a solder problem, You must take it out and scrap off the leads to remove the excess enamel paint the reinsert and resolder. Also check connections on the driver transformer too(horizontal). Next check for bad solder connections on the flyback transformer too. Good Luck
PS please dont forget to rate this thread.
its the high voltage regulation,the power supply regulators bad or could even be a bad picture tube. now If you have done electronic repairs in the past then I would advise you to get a service manual and see whats going wrong by monitoring the B+ while the set gets turned on BUT if you dont know what a regulator is I would advise that you call or take thats right take the set to the repair shop and see what the friendly person says. if they have a flat rate thats a good thing. BUT if they have an per hour rate then thats where your gonna have to say to your self >> "myself?? how much did I spend for this tv?? is it worth repairing??" Its all on your guess. Good luck