Bush lcdtv fault?

Hi i have a bush idlcd32tv27hd fault. We were watching the tv when it just went to standby and couldnt turn it on again the first time it done it after a min it turned back on then after a min went to standby again so turned it off at socket for 5 mins but still the same as soon as you push a channel button on top of the tv it shown the channel box for a split second and returns to standby ! any ideas ? im an ex electronics engineer but not so good with tvs and havent taken back off tv yet to check frame clapse ic or dry joints yet and dont know if its better taking it to a tv repair shop.