Re: sony kdl-46xbr6 slow refresh

The diode looks to just be a protection diode, protecting from negative voltages or over voltage, and meters won't properly test it with the low impedance there (my board shows about 50 Ohms on the 1.0V core rail to ground). I would doubt that the diode is ever activated under normal operating conditions. I'm thinking that it would be unlikely that the diode would be going bad on TVs after so many years.

You probably need to the high and low fets off the board and check if they are good, and or simply replace them. Have you run the...

Re: sony kdl-46xbr6 slow refresh

I don't have any image problems right now, but I also didn't replace F603, and I have an external power supply for the Cayenne 1.0. I looks like uses almost 2A at 1V, and the whole set ran strong for over 24 hours now with the external power supply.

I spent some time looking at the power converter since it looks like it's going bad on lots of units, and the parts from my board to see what is wrong on my unit, and it looks like my high side Fet is bad. Oh, if the High side Fet is shorted, when the low side is turned on, you will get...

Re: sony kdl-46xbr6 slow refresh

Hey, I figured I'd chime in here as I'm chasing the same problem with the original failure showing as the TV shutting down after a few hours with a 14 Flash pattern, finally not displaying anything with F603 blown.
So far, like you guys, I've tracked this to the 1.0V Core power for the Sony Cayenni-T. I've taken the power switcher out of the circuit and powered the 1.0V externally and everything looks perfect. That isolates this into the switching supply. I'll keep you guys updated.