Question about Yamaha RX-770
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Posted on Jan 02, 2017
I've been having the same problem for 3 months. Checked connections, sent unit out for repair (3x), contacted Yamaha (no help at all) and still the same problem. I've spent over $350 in repairs and I'm very frustrated. I think I'm going to just buy a new receiver (not Yamaha).
Posted on Feb 17, 2008
SOURCE: Yamaha RX-V420 No power
If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Posted on May 12, 2008
There is a fuse in side the system you could try but that sounds like the channels is shorted, but yet again there could be a fuse for it
Posted on Nov 09, 2008
I suggest you run self diag. press [FM/AM] key + [Input mode] key and press the [power/standby] switch.
ps prt = power supply problem
dc prt = shorted output or leakly cap in channel
tmp prt means to hot on heatsink
you'll likely have to measure the resistances of the output FETs to find a short,
Posted on Feb 03, 2009
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