Question about Yamaha RX-V800 Receiver

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RX-V800 Shutdown on Function Change

Hi, the above unit is able to be switched on and appear with the screen.
However when I press the mode function button to switch between CD, Video, Tuner etc I hear the relay click and the unit switches off. I can not get it to switch back on, but can hear the relay clicking trying to do something.
If I turn the mains off, leave it for a minute or two I can switch it back on, but still have the problem above.
It was working great one day, then the next this problem.
Any ideas on what I can do?
I have read the other posts and I am hoping it is not the amp. Might not be worth repairing.
Regards Kevin.

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  • jasonmolinar Dec 08, 2008

    I have a similar problem, except that my V800 goes into protection mode after 3 seconds. In diagnostics it says DC PRT :023, which i take it to mean that the 5V supply is off by 23% (according to the diagnostics manual).

    Thanks to Serafis' post above, i traced on the schematics where i can find the +5V and -5V are generated and rectified (Power Schematic E-68/J-64 Power 4 and Power 6). I will check those voltages. But Serafis is saying i need to replace the blown out transistors too in the amp stage which i think is Main Schematic Main 1 E-67 / J-63), but there are dozens and dozens of transistors in that schematic. Am i to check them all!?

    Can anyone help me narrow down what i need to check in the power amp schematic?



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If you can get it to turn on, you can check the problem by holding down the A/B/C/D/E and Right Preset buttons (on the amp not the remote) while turning it on (pressing Standby). This enters diagnostic mode and displays a message. If it says NO PROTECT then the protection circuits have not been triggered (see below).

If it won't turn on at all, try unplugging it and leaving it for a few days to let all the capacitors discharge. You often only get "one hit", so turn iton in diagnostic mode first.

If the dignostic message says "DC PRT nnnn" then one or more amplifier output stages have DC voltage and you will need to identify which one(s) and replace the blown output transistors and any other affected components. They aren't all that expensive, but dismantling this model is a bit of a struggle! However, if it turns on and stays on until you press a button, then the amp output stages may well be OK.

In which case, it is more likely that the microprocessor is detecting a voltage or current anomaly (PS PRT :nnnn or I PROTECT).

I had the same problem and, after replacing all components on the three main power boards, the problem went away until I reassembled it all, then it suddenly started again.

I now think this is possibly a grounding problem. Many of the boards are grounded via the chassis, and after some years use a grounding /chassis screw may get loose or oxidised causing the problem.

I dismantled the amp and soldered a length of hookup wire from a grounding point on each board to a grounding point on the next, so that all of the main boards' grounds are directly connected back to the power supplies grounds. I didn't worry about the front panel boards.

Also replace the 0.047F 5.5V memory backup button capacitor near the top of the input / microporocessor main board (second board from right) as this is prone to leakage, and check / clean any leaked electrolyte from this board. Icouldn't get a 0.047F capacitor so I used a 0.1F 5.5V one.

So far (touch wood) this has worked and I am running the amp as my main receiver for a while to make sure it's fixed the problem.

Hope this helps someone.


Posted on Nov 16, 2008

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The problem is a cold solder on the front panel. Yes replacing it does fix the issue. But just resoldering the front panel will be good. I have done 2 now and both worked. Also check and or replace C633 it is a known leaky cap. It is for memory.

Posted on Oct 13, 2009

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Change the front panel board ant it will work

Posted on Nov 02, 2008

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