The Eastern Hemisphere market KV-HR and KV-HX models give 10 blinks for a D board error. Those TVs often contained MCZ3001DBs. 6 blinks from those models instead indicates an A board error.
I should update this with what I've found stated on other forums.
There are two MCZ3001D* chips on the D board in the HR and HX, at IC8002 and IC6400. The IC8002 MCZ3001D* will give 10 blinks when faulty, but a faulty MCZ3001D* at IC6400 may yield 6 blinks when faulty, falsely implying the A board is the problem. It looks like that for the HR/HX it is usually a single-chip fix.
Allegedly, IC8002 and IC6400 utilise different portions of the MCZ3001D* chip meaning an MCZ3001D* chip in IC8002 gone bad may still work in IC6400 (equivalent to IC6501 as it seems to be on the XBRs). That is, it is sometimes possible to 'fix' the problem by merely swapping the chips. I'm sure this would be a bad idea unless you intended to socket both ICs anyway, and even then....
One technician stated with respect to the IC8002:
"I always setup screen pot to cathode voltages after replacement of IC. If this is set wrong it can give the same error and shut down."
Could anybody expand on this? Anything I try to search about this only turns up marijana.