Fail picture on Tv Set Panasonic TX28DK20F Euro4H Chassis?

Hello friends.I have a Panasonic TX28DK20F to repair and the faulty is when turn on the tv set picture appears only a few seconds and disappears and stay the CRT always in black colour.Sometimes the picture returns and disaperas again.Sound ok.
I resolded the crt board and view solders in main board and its ok.I measure MAT 31KV, G2 400V, B+ 206V, H1-H2 6.3V RED 193V, GREEN 193, BLUE 193V.
Anyone have this faulty??