One board is faulty and need to be replace V1400/V2400 Func board. Any idea where to order this

First things first... Disconnect all speakers from the receiver and then turn it on. If it still shuts off, there is an internal issue, if it stays on, its an external issue. Post a reply with your results and I can help you with great detail if needed. Hope this helps.

You would connect the rx-v2400 record output to the power amp input. You might need to Clarify your question here in more detail. Larry's Electronics

Through the tape in/out jacks and also push the tape monitor button when using the eq!

Need a new keyboard, let us know if you would like one ordered

You can find fuses near in the transformer.

Hope it may helps;

KT4V link:  3GB Ram Max http://global.msi.com.tw/index.php?func=proddesc&maincat_no=1∏_no=505

  MS 6712 is a design compliant number.KT3V, KT4v,KT4AV are all MS 6712 compliant:
http://global.msi.com.tw/index.php?func=searchresult&keywords=MS-6712

Hey, yeah that can be frustrating.

When you turn it up do you hear the relay or a clicking sound, then you turn it on and it comes back below the +2db?

Try unplugging All the speaker wires from the unit. Turn on the unit and listen for the click.
after the click, turn it up past the 2+ db mark and see if you hear it click or shut down. If it did not click off, then suspect a shorted crossover on one of your speakers.
2nd test is to plug in One speaker, and test it at high volume, it will not harm it. If it shuts off disconnect that speaker and try another. Only one at a time.
If it works at high volume, you need to isolate one of your speakers and i bet it has a shorted crossover that has been cooked. P.S. If one is bad, suspect they will fail at a later date.
If they all fail, use a friends speaker and try it before sending it to a repair shop.

P.S. i found one on ebay i think you can get for under $100 bucks in the box.

http://cgi.ebay.com/Yamaha-RX-V1400-7-1-THX-Select-Receiver-MINT-Condition_W0QQitemZ330311512027QQcmdZViewItemQQptZReceivers_Tuners?hash=item330311512027&_trksid=p3286.c0.m14&_trkparms=72%3A570|66%3A2|65%3A12|39%3A2|240%3A1318

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error for faulty temp sensor we can try to clear 1st if it comes back you need to have the thermister changed..... inthis order press add func key / then 2 & 8 key at same time / then add function key again . ( you mayneed to do this acouple times) screen should change to serv mode then in this order touch copier / function / clear / err / ok turn off copier then turn on good lick

Hi Seems like you have a shorted output channel, remove all your speaker connections and try again, if the problem persist, good chances are that you need to replace a couple of power transistors, let me know if you need more help, I've fixed some Yamaha amplifiers with this problem Good Luck Miguel

yamaha receivers protect themselfs when the power transistors at the output section are shorted, I just posted what you can look for this failure.