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RX-V650 Yamaha AV Reciever

 
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ranilvigilia



Joined: 21 Aug 2010
Posts: 6
Location: kuwait

PostPosted: Sat Aug 21, 2010 9:30 am    Post subject: RX-V650 Yamaha AV Reciever Reply with quote

i have this av reciever Yamaha RX-V650 cant stay power on. it can power on 2-3 second then turn it off by itself.
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ranilvigilia



Joined: 21 Aug 2010
Posts: 6
Location: kuwait

PostPosted: Sat Aug 21, 2010 9:35 am    Post subject: Reply with quote

impedance selector switc seems ok. c405, c406, c411 was change still the same. any body can help me pls.
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Sat Aug 21, 2010 1:00 pm    Post subject: Reply with quote

http://elektrotanya.com/?q=showresult&megnev=yamaha&megnev2=RX-V650&kategoria=&kat2=all

Output transistors shorted?
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ranilvigilia



Joined: 21 Aug 2010
Posts: 6
Location: kuwait

PostPosted: Mon Aug 23, 2010 8:43 pm    Post subject: Reply with quote

all power transitor ok, all power supply meseured ok, no sign of shorted or burn,all fuses ok, my problem is, when put power on the display will come on and sudenly it will power off with in 1-3 second. and the speaker relay not yet get on.
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jts1957



Joined: 24 Nov 2008
Posts: 2472
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PostPosted: Mon Aug 23, 2010 9:32 pm    Post subject: Reply with quote

Power may measure O.K. at the source but may not be reaching the final destinations.
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PostPosted: Sat Aug 28, 2010 6:23 am    Post subject: Reply with quote

hi jts1957
i have just found one of the channel showing with -4 to -6volt output voltage. sopuse to be zero. changed output transistor still the same.
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Sat Aug 28, 2010 1:37 pm    Post subject: Reply with quote

Measure the same points in both channels until cause is pinpointed. Could be a driver transistor or even a bad resistor.
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ranilvigilia



Joined: 21 Aug 2010
Posts: 6
Location: kuwait

PostPosted: Mon Sep 06, 2010 9:11 am    Post subject: Reply with quote

jts1957,

i solve the problem. it was a capacitor at the deffirential amplifier. capacitor get leakage. ( c323 / 47uf/16v ) at SBR channel.

thanks bro for giving me the site of service manual.
more power to you and god bless.

ranil Smile
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