This stereo has a blinking red power light, when I push the Enter and Advanced surround for 3 seconds it will come on but then go to Amp Error and shut off so I tried pushing the Enter and Advanced Surround again but this time I hit the power button to shut it off before it went to Amp Error and the red power light would stay lit. Then I powered it on and held the Tone and Power buttons till it said reset then I hit Tone again then it said Confirm So I hit Tone again and it would Reset for a second or 2 then say Amp Error. I've read someone else had this problem and it was the transistors at Q696 and Q697. These are C1740's with R S P under that. From what I can tell these are obsolete so my Question is what are comparable transistors to replace these with? Any help would be greatly appreciated.
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Re: Transistor replacement
Would it worth taking a gamble getting the from here?
http://www.utsource.net/2SC1740S.htm...FQYJvAodVHQADw
or
here
http://www.ebay.com.au/itm/2SC1740S-...item258550465a -
Re: Transistor replacement
Make and model of this stereo? Service manual?
Protection error that you are seeing due to the fault in the power amp sections?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Transistor replacement
Its a Pioneer VSX-D812. 2sc2240 should work
He has another threadAttached FilesLast edited by R_J; 12-12-2014, 07:01 PM.Comment
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Re: Transistor replacement
I did order the 2sc1740s from utsource 5 for 4 buck with shipping. Then found out they are in China so i think ill look for the 2sc2240's on Digikey or mouser.
Yes its a pioneer VSX-D812. Old but i am fixing it for a guy that seems to really like it.
Thanks for the input guys, ill post back with the results in a few days.Comment
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Re: Transistor replacement
see post 4?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Transistor replacement
I can't find 2sc2240 at Mouser or Digikey. Know of a reputable place to get these?Comment
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Re: Transistor replacement
http://www.audiolabga.com/mal_cart/m...0&find=2sc2240
http://www.audiolabga.com/mal_cart/m...0&find=2sc1740Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Transistor replacement
Your site had them budm, thanks alot buddyComment
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Re: Transistor replacement
Ok I replaced these 2 transistors after reading a thread on another site but still no go.
I have found a service manual but not sure how to follow it.
http://www.opweb.de/en/model.php?id=2138
Can anyone tell me what to check next?Comment
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Re: Transistor replacement
Had the exact same amplifier in today. The power led would blink all the time and wouldn't power up. Done the surround sound and enter button trick, amp came on for 3 seconds, displayed AMP ERR and turned back off. Checked the bricks and the DC detect circuit, bridge rectifier, diodes etc. and could not find anything.
Anyway, I took the amplifier board out and resoldered both amplifier modules and some other solder joints that had rings around. Cleaned everything up with alcohol. Then I put the amp back together, plunged her back in an got the blinking power led again. Then I did the surround sound and enter button trick again, the amp came up and all is good! 
This fix is specifically good for those that had a problem with the sound cutting out for a split second once in a while, then the amp turned off and the pwr led keeps on blinking.
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