Originally Posted by M Code
There was a service bulletin released a few years back about the failure for the subject fuses. I don't recall all of the details, but I think a few other components were recommended changing as well...
Yes, I'm familiar with the service bulletin you're referring to (# HK2008-03). That's what pointed me toward the two fuses as the likely cuplrits. That bulletin recommended three separate upgrades/mods:
1) Replace F110 & F111 with higher-value fuses (2.5A -> 3.15A).
2) Install a jumper wire between HDMI board & Regulator board.
3) Perform a firmware update.
As I said, the receiver appears to have already had all three of those upgrades performed when it was brought in to Best Buy for service several years ago.
(btw, there was also another service bulletin (# HK2008-04) which recommended the upgrade of two capacitors on the same board. But this particular unit is from late 2008, and appears to have had the upgraded caps installed at the factory).
Anyway, tt is now working again after replacing the two blown 3.15A fuses. But I'm just a bit mystified as to what caused those two fuses to blow, given that they were of the recommended higher-amperage value of 3.15A. My guess is that it must be a design flaw. I've seen other posts where users have recommended just replacing those fuses with a jumper wire. But to me that sounds too much like sticking a penny in a fuse box - probably not a good idea safety-wise.