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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 16 Jul 2022, 06:36 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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Posting an update. I had to take most of the machine apart. Don't ever work on one of these. I was able to get 120V all the way to the step down transformer. After that, I wasn't reliably able to get 12V or 5V from different test points. I had to cut the wires on the transformer to get it out. I did some testing with resistance on the transformer, but results were inconclusive. It will be a miracle if I can piece this back together. Encompass parts claims to have the transformer, but it's not in stock. P/N is ATT1193 I'm lost on this one. The power board won't come out cleanly for me to test. There are some old pin type ribbon cables that I can't loosen the housing clip. It feels like the clip is going to snap and just won't give way to pull out the ribbon cables so the PS board can be released. Going to get some rest and come back to this one later. Should I order the transformer? I may put it back into service with some patch wires to join everything back together again so I can test voltage taps.
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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 17 Jul 2022, 22:22 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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Thanks for your replies, cplusplus. I made another attempt at further taking this apart last night. There are regular gray type clamps for ribbon cables and there are white ones. I was able to remove the gray type ribbon cables easily enough. The white ones, however, did not come very well. When I pulled the top off these, the ribbon cable goes in there in a very specific way that I'm not sure I can put back together. This one may be a goner. I cut the transformer out the other night, leaving 1 inch leads on all previously connected Test Pins. This way, I can hook it back up like for like. With the way these ribbon cables are, it doesn't seem like this was meant to have one board come out at a time but rather pull all the boards connected, leaving the ribbon cables intact. I need to rest on this thing for a day or two and get the wherewithal to try once more to put it back together and test your pin spots. One positive I have gotten from this is I figured out where on the audio board to tap for Optical and Digital Out to bypass the 5.1 discrete outputs. The tap point is tiny. I have a photo added below that shows where it is. The first photo is of the audio board cover that needs to be removed to access the audio board. Audio Board cover Audio Board Pin 65 for Digital Out Board Ribbon Cables
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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 19 Jul 2022, 06:28 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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OK, I have some results. I tested Pin 77 (what I think it is, at least). Included is a pic of what I marked as Pin 77. So strange, when I used the multi-meter set on DC Volts, I had the black probe touching the chassis and the red probe tapping pin 77, but I didn't get anything. I switched over to AC Volts and put the black probe on the neutral lead of the wall cord solder point on the power supply and the red probe on Pin 77. I got 1.5~ Volts. I would assume since this is after the transformer, I should expect 5 or 12 DC Volts? Also submitted is a pic of 3 capacitors on the power board. Are these bulging enough to warrant a replacement? I haven't cleaned the SMD caps yet (little silver ones, right?) Will clean those tomorrow. Should I just leave the unit plugged in after cleaning the caps and check for leakage?
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cplusplus
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 19 Jul 2022, 14:07 |
Hardcore fan |
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Joined: 13 Aug 2018, 03:18 Posts: 1520 Has thanked: 449 times Been thanked: 588 times
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ldstl wrote: I haven't cleaned the SMD caps yet (little silver ones, right?) Will clean those tomorrow. Should I just leave the unit plugged in after cleaning the caps and check for leakage? Yeah. Can leave unplugged. In this case I am meaning physical leakage rather than electrical. Look for discoloration (i.e. dark spots) that can't be cleaned immediately around the base of the leads. Those big ELNAs look fine to me. Sometimes the vents on top can appear to be bulging. Trace this path for voltage: D210, IC207 (M5278L56 voltage regulator), D224, C303 (positive lead), Pin 80 (power actually goes into several pins but 80 should be easiest to probe on the corner).
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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 19 Jul 2022, 21:34 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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Plot thickens, er cracks. Pulled all of the boards out together, flipped everything upside down and had a look. It appears I have leaking caps and a good sized crack on the secondary side after the transformer. Makes sense now why I don't have standby power. Have a look. Cracked Board Caps
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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 21 Jul 2022, 04:19 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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Update: I soldered in all of the jumpers and now there is power to the unit! It was 12 total jumpers that needed to be installed (including 1 trace re-do). Honestly, the soldering was the easy part. Running down all of the traces was more difficult. Here's a photo of the soldering. and then the unit powered on. Jumpers installed Powered on Now, the bad news. I hooked this up to a CLD-R7G with AC-3 and playing an AC-3 disc, but never got a signal lock. Swapped everything over all the same to a Sony SDP-E800 and got signal lock right away with sound output. I was eager to put the unit back together, but will take it apart once more to see if I can find any more obvious cracks. Nothing appeared burnt out on any of the boards. This is exhausting but exciting all at the same time. If anyone has suggestions on next steps, I'm all ears. For my part, I'm going to start ringing out connections from the power supply to other boards, then other points.
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ldstl
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Post subject: Re: [SP-99D] No standby light, need photos of power supply Posted: 29 Jul 2022, 04:33 |
Honest fan |
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Joined: 23 Jan 2018, 05:28 Posts: 66 Location: United States Has thanked: 10 times Been thanked: 25 times
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Have an update:
I tried the following scenarios - Optical cable from LD player to Digital Input 2, output to receiver on L R and C outputs, no sound. - Left and Right RCA from LD player to Line 1, output to receiver on L and R outputs on multiple inputs (5.1 Multi Ch In and the front auxiliary plugs) - Left and Right RCA from LD player to Line 2, output to receiver on L and R outputs on multiple inputs (5.1 Multi Ch In and the front auxiliary plugs)
No sound on any of these. Next, I went right from the LD player into both Multi Ch In and Auxiliary on front of receiver, got sound right away from LR channels on back of LD player.
I'm going to take the SP-99D apart again, but this sounds like a pretty big deal if it isn't decoding a single thing sent into it.
Any ideas?
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