Protect mode on Sony TA-N9000ES

[eforer]

Hi Guys,

The amp I use for my home theater setup (not my primary listening rig) is a Sony TA-E9000ES. Yesterday, I cranked it on and the standby led started flashing indicating protect mode. I disconnect every input and output to confirm there was no shorts across any of the speaker outputs etc. The problem remained. After doing some digging, I came to discover that the common fault in this amp that causes this symptom are 1 of two resistors on the main amplifier pcb, R220 and R221. Both are 1 watt 1 ohm resistors. I measured them in place (which could effect the measurement of course) and found them to be nominally 1.5 ohms. Is it even plausible that a .5 ohm drift (granted, its a huge drift out of tolerance) could cause this thing to go in to protect mode?

I appreciate all thoughts and insights.

Thanks in advance,
-Ed