Question about Yamaha RX-V457 Receiver

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Yamaha rx-v457 intermittent power problem

This unit has an intermittent power problem. Sometimes it turns on and sometimes it doesn't.

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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simplemitch
  • 752 Answers

SOURCE: Yamaha RX-V1 Power

The amp is blown. Unhook all speakers and try it again. If it still shuts down it will have to be repaired.

Posted on Nov 29, 2007

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  • 4234 Answers

SOURCE: yamaha rx-1500 av receiver

The unit is in protect mode. There is a problem with the last stage of the amplifier section and the unit shuts down to prevent further damage. The most common cause if this is shorted output transistors. If you are comfortable with soldering, you should be able to repair this. Check the transistors attached to the heatsink for a shorted condition. Replace them in pairs.
Keep us posted.
Dan

Posted on May 20, 2008

  • 125 Answers

SOURCE: Yamaha RX-V995 receiver turns on & then powers off 2 seconds late

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

Bennytechkid
  • 99 Answers

SOURCE: Yamaha RX-V750 AV receiver power problem

G'day i have had the Same Problem With a Yamaha RX-V750 That i have Repaired...You need to Replace the Three Capacitors On the Sub-Transformer Board...They Hold a Small amount of current to use to turn over the transistors and in turn trip a relay that boots the unit these go dry all the time in these units..replace them and it will work again no prob's
Components As Follows:
2x 2.2 uF 100V (C402) (C403)
1x 1uF 50V (C401)

The relay also could be damaged...or the diode across the Coil you may have to replace these too these faults could have been caused by a surge...or just faulty cheap and nasty components!!

Ben M

Posted on Jul 09, 2009

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