Sony STR-DE635 receiver no sound, what's blown? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th July 2007, 08:25 AM   #21
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Quote:
Originally posted by jamil5454
So, there is no IC1207 on the digital board (contrary to what the schematic says). I did, however find a 5v BA05T (IC1204) and after checking it's three pins none of them are shorted together.
Why not assemble the amp and check if you have 5V at the terminal of IC1204.

/Hugo
  Reply With Quote
Old 11th July 2007, 05:33 PM   #22
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi jamil5454
Hugo has a good suggestion there.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 11th July 2007, 07:17 PM   #23
diyAudio Member
 
Join Date: Jul 2007
Uh oh.

I just reassembled the amp and now when I plug it in I hear a clicking noise (I think it's the power switch relay) that gets louder and louder until both 8A fuses blow on the AC board. It takes about 3 seconds. Hmmm, what could I have broken? Sigh...
  Reply With Quote
Old 11th July 2007, 07:27 PM   #24
Bigred is offline Bigred  Canada
diyAudio Member
 
Join Date: Jul 2007
What is broken? Prolly more and more as you continue to replace fuses and power up the amp
  Reply With Quote
Old 11th July 2007, 07:36 PM   #25
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Maybe a mica insulator is missing on one of the power transistors.

/Hugo
  Reply With Quote
Old 11th July 2007, 07:43 PM   #26
diyAudio Member
 
Join Date: Jul 2007
Oops, those were required? crap let me find them.
  Reply With Quote
Old 11th July 2007, 07:52 PM   #27
Bigred is offline Bigred  Canada
diyAudio Member
 
Join Date: Jul 2007
LOL.... sorry to laugh but believe me, manufacturers nowadays skimp out on everything possible and they wouldn't have parts just for the heck of it. YES those were required. A thin film of heatsink grease prolly wouldn't hurt either. Also if there were insulating washers present with the mounting screws. NO SPARE PARTS
  Reply With Quote
Old 11th July 2007, 07:52 PM   #28
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
If some or more were missing, make sure next time you power up to use a fuse of about half the required rating.

/Hugo
  Reply With Quote
Old 11th July 2007, 08:05 PM   #29
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi jamil5454,
Quote:
Oops, those were required? **** let me find them.
You're either having fun with us, or ..... oops!

Don't worry. I see technicians forget to install them all the time, or my favorite, the use two (results in overheated outputs).

You must clean the transistors, heatsink and the mica insulators. You must also use fresh grease. If an insulator is cracked or damaged in some way, it must be replaced. Those steps are not optional, sorry.

If this means you must put everything aside for right now, do it.

Can you just install everything for a quick test? Yes. Just clean all the old grease off everything and remount it dry. Don't run speakers for any length of time and keep the volume down.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 11th July 2007, 08:25 PM   #30
diyAudio Member
 
Join Date: Jul 2007
Alright, I got those insulators out of the trash and applied some Arctic Silver to them and the transistors and still have the same problem. Obviously I thought it would be similar to a CPU heatsink but apparently not.

I will clean the transistors and heatsink off thoroughly and try it dry. I replaced the 8A fuses with 5A instant-blow ones so I should be ok there.

Thanks everyone for your help. I'm learning so much.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
sony 6ch receiver help thetube0a3 Solid State 1 30th March 2009 06:41 PM
Please help: no sound and blown fuse spendorspain Tubes / Valves 6 11th December 2008 01:48 PM
Pioneer HT receiver... blown channel? infinitesymph Solid State 13 17th February 2008 10:50 PM
No power / repeated blown fuse in Sony STR-D915 dmworking247 Solid State 0 21st January 2008 08:37 AM
Blown Tangband 871 sound? Destroyer OS. Full Range 2 3rd October 2006 05:48 AM


New To Site? Need Help?

All times are GMT. The time now is 08:51 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2