I've checked searching for dry joints, resoldering all, broken traces, nothing.
I desoldered my replaced smd and nothing. Now soldered again.
Can't it be just the Sony chip? I could try to solder another from a donnor. If you don't say no I'll try tomorrow.
I've tried with the RF but coudn't watch it (perhaps had to change something of my Tv, dunno). With the Composite I have first this:
And this at the end: