Sony KV36FS76U

[brainstorm]

Hi,

Are there any sony experts out there?
I have a Sony KV36FS76U which goes dead with 5 Blinks of the LED after about 20 Mins
I have tried replacing the Line drive Ic (MCZ3001D) because I have had that IC give intermittent problems before, but thet normally gives 16 blinks.

Any ideas or does anyone know what 5 blinks indicates?

Thanks
Brian