Hi,
I have 2 here, in Yorkshire a 26" and 32" both with the same fault. What I have found out is they only lock up on channels from frequency 40 ie ITV, CHAN 4, CHAN 5, MORE4 and E-4.
The 32 uses a nice Samsung, so the screen can go in a 32R88. The 26" one uses a Chi-Mei and I have a few sets that need that screen "V260B1-L01". Sad that they will both be scrapped for such a silly fault...that's life.
Laterzzz.