RGBHV or YPrPb may be invalid

Hi, I am the owner of a Mitsubishi TV model WS-55859 which is now blicking and shutting off repeatedly. Before this happened it gave me a blue screen - came on and off  and gave me the message RGBHV or YPrPb may be invalid or check power source.  We replaced all seven capacitors on the DM module board.  The TV came on with the same message. It flicked for a few seconds and then the picture and sound came on. It operated fine for twenty- four hours until we turned it off. The next day  we tried to put it back on and got the same blicking light and shutting off sequence over and over again.  Can anyone help me with this problem?