Sony STR-DE635 receiver no sound, what's blown? - Page 2 - diyAudio
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Old 9th July 2007, 09:03 PM   #11
Bigred is offline Bigred  Canada
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A pdf version has been email to anatech. If memory serves me correctly these units were bad for cold solder joints and loose grounds also. While you have the hood open and diagnosing your output prob... might as well check those also.
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Old 9th July 2007, 10:09 PM   #12
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Just for the record, I wasn't the one who wired the TV amp to the receiver. If I did that I may not have had the courage to post on this board. :P

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. I also checked three-pinned transistors I could find and no shorts.

The only places that look like they got hot are:
- PCB around power output transistors (obviously)
- PCB around speaker terminals
- PCB around discrete 5.1 inputs on digital board
- IC501, IC601, IC701

I could be missing something though. Some of the three-pin transistors I measured (e.g. Mitsubishi 7905) were open between two pins; is this normal?

Here are some pics I took:
http://jamilb.googlepages.com/digita...ard_4-full.jpg
http://jamilb.googlepages.com/digita...ard_5-full.jpg
http://jamilb.googlepages.com/digita...ard_6-full.jpg
http://jamilb.googlepages.com/frontc...trans-full.jpg
http://jamilb.googlepages.com/rear_a...board-full.jpg
http://jamilb.googlepages.com/rear_a...ard_2-full.jpg
http://jamilb.googlepages.com/speake...board-full.jpg
http://jamilb.googlepages.com/digita...ard_1-full.jpg
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Old 9th July 2007, 10:15 PM   #13
anatech is offline anatech  Canada
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Hi jamil5454,
Quote:
Some of the three-pin transistors I measured (e.g. Mitsubishi 7905) were open between two pins; is this normal?
Yes. Measure the voltage after you get it running - or not.

I need to go do something, but I did get the schematic - thank you!

Back in a bit.

-Chris
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Old 10th July 2007, 02:10 AM   #14
anatech is offline anatech  Canada
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Hi,
Just as I remembered. uPC2581V and the famous Sony parts MN2488 and MP1620. I don't know if 2SD2488 and 2SB1620 will work properly. They are both darlington types.

Pretty much certain that they are all gone, but you can try just the outputs. The chip may be bad and cause the others to go.

Frequently, the emitter resistors will open up as well.

-Chris
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Old 10th July 2007, 04:09 AM   #15
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Thanks Chris, it looks like I'll go ahead and order 3 uPC2581's, 5 MN2488's, and 5 MP1620's and try my hand at swapping them out. If I can get this thing fixed it's going in my parent's new home, driving a 5.1 setup and 2 outdoor speakers. :P

For future reference, does RadioShack carry this type of stuff? Do they usually have what you need or should I get it online?
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Old 10th July 2007, 04:11 AM   #16
Bigred is offline Bigred  Canada
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hrrh hrmmm... yeah no problem :P
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Old 10th July 2007, 06:11 AM   #17
jaycee is offline jaycee  United Kingdom
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Forget radio shack.

The MN2488 and MP1620 are just Sony part numbers for Sanken 2SD2488 and 2SB1620. This is what Sony would give you if you ordered parts from them.

uPC2581 - you'll be lucky - they are most likely long obsolete.

With this kind of damage, you are going to be paying more than the reciever is worth to repair it, assuming it can be repaired. That digital board might be worth keeping/selling though
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Old 10th July 2007, 02:07 PM   #18
anatech is offline anatech  Canada
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Hi Jaycee,
Quote:
The MN2488 and MP1620 are just Sony part numbers for Sanken 2SD2488 and 2SB1620. This is what Sony would give you if you ordered parts from them.
That's what I've heard. I have always ordered the Sony part (marked with the MN/MP numbers) because I was seeing a number of the 2S numbers coming in from other shops. Sony shipped the Mxxxxx numbered parts. Those are expensive, the uPC2581V IC's weren't nearly as expensive as I recall.

Anyway, that's why I said you could give them a try. Thank you for confirming that they are direct subs.

Quote:
With this kind of damage, you are going to be paying more than the reciever is worth to repair it, assuming it can be repaired. That digital board might be worth keeping/selling though
With two or three channels gone, yeah. This will be more expensive than it's worth to repair.

-Chris
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Old 11th July 2007, 06:27 AM   #19
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Well, after checking a few places online it seems the uPC2581V is either hard to find or it's really expensive. I thought I got lucky with electronix.com and ordered parts to fix 5 channels, selected 2-day shipping, and then BAM they call me the next day and reveal they're out of the uPC2581V and MN2488. Since I don't have the proper equipment/skills to check which exact component(s?) failed, it looks like I'll just put it back together for future possible spare parts use.

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Old 11th July 2007, 06:47 AM   #20
Bigred is offline Bigred  Canada
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Too bad
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