Flashing Red Standby Light.
My AVR-3313CI has quit working. I thought at first that it might have been related to changing the TV, but even if that was the original cause (doubtful because the only connection was the HDMI plus both the TV and AVR connected to my LAN), but now the AVR is stuck in the red flashing mode.
It started out as an intermittent problem, or to be more accurate, a problem that occurred after a while (from minutes to hours). After a while with Pandora, the AVR would quit and just show the red flashing light. I was able to recover it - first by powering off and on, then by removing the power cord. But it always quit eventually, regardless of what input was selected. So now I think the problem was just manifesting itself before becoming solid, and the new TV was just a coincidence. Or perhaps a spike was generated that created / exacerbated a problem. It doesn't really matter.
After doing some Internet research and discovering comments that the power circuits aren't robust, I decided to start investigating from the inside. [Out of warranty by now]. Some of the YouTube videos implied that earlier models were simple to fix, but I'm not having much luck. I purchased the service manual, and started a deeper look, but I could use some help.
I checked out the AVR without any connections other than power. Same issue.
The SMPS board looks OK - at least it is producing 5V , which is as far as the service manual goes, and seems to be the only thing that I care about. I checked the transistors on the SMPS board with a multimeter for good measure - they look OK. Fuses are all OK.
Now I'm guessing that one or more of the power transistors has died, or at least something on the TRANS board, but perhaps others have different ideas. I used to be an electronic engineer (many years ago) but I'm lost with this. I have removed all the boards above the TRANS board, but that's as far as I've got. The manual shows 6 of what look like power transistors, but the board only has 5 soldered in (and a space for the 6th).