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Old 29th December 2014, 08:00 PM   #1
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Default SounDigital SD16KD-SMD

I got this amp in with a blown power supply, and many damaged traces in the power supply section. I removed all the outputs and checked them. They are all O.K.

I repaired all the damaged traces. I removed all the ps transistors. I removed and checked all the BCP53/56 drivers for both the ps and output sections.

Now here is the problem... all drivers are O.K. I reinstalled them. When I add power it goes straight into protect. LED blinks rapidly for about 16-17 flashes then tries to turn on. I get a quick look at the ps wave form which looks different from what I'm use to. It only tries to come on for a second or 2 then goes back into protection. It doesn't seem to be trying to pull excessive current. There is about 5vdc on the speaker output terminals while in protect and it goes down to about 2.5v when it tries to turn on.

Please see the pic of the wave form. The settings are 5v/div and 20us.

On the check holes next to the IC I get:

4.9vdc on VDD,
4.9vdc on VPP,
2.28vdc on CLK,
0.000v- 0.005vdc on DAT (goes up when not in protect)
0.000v- 0.005vdc on VSS (goes up when not in protect)

I'm thinking maybe the PIC16F1828 is the problem??? Is there a good way to check it? I'm not sure what pins do what. I should have much more voltage on VSS should I not?

That wave looks the same on the emitter of both BCP56N's.
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Old 29th December 2014, 08:34 PM   #2
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Does it have flashing protect LEDs that indicate what the protection fault is?
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Old 29th December 2014, 08:37 PM   #3
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It has a RED LED that flashes for protection yes. It doesn't blink to any specific rhythm. Just blinks for a long time (about 16-17 times) tries to turn on for like 2 seconds, then back to blinking 16-17 times, then tries to power on again, over and over.
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Old 29th December 2014, 08:41 PM   #4
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Look up the owner's manual to see if the blink rate means anything.
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Old 29th December 2014, 08:55 PM   #5
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I can't find one specifically for that amp. Seems like the website is down too. I have a manual from a different SounDigital amp. It says 3 blinks low battery, 4 blinks low impedance. Nothing about constant flashes.


Edit: I got lucky and the owner left the manual inside the box. After using a bunch of google translate, the only thing it says about the red LED blinking is 10 times is low power. "Red led is lit" = thermal. I'm going to put a resistor on the outputs to see if it's just cause there is no load connected just to see but I doubt it...

Adding a load made no difference and it blinks exactly 16 times, before trying to turn on, then another 16... over and over

Last edited by Deadly Sones; 29th December 2014 at 09:22 PM.
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Old 30th December 2014, 02:12 AM   #6
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On Stetsom amps (may be similar), you can remove the output transistors and check the drive signal.

Does it go into protect with the output transistors out of the circuit?
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Old 30th December 2014, 06:38 AM   #7
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The amp currently has no ps or output transistors installed when doing this blinking. I did remove the drivers from both ps and output sections and checked them. They tested fine so I reinstalled them.
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Old 30th December 2014, 07:40 AM   #8
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I've never tried to power up similar amps without the power supply FETs. Could it be waiting for output from the power supply before it allows anything else to happen?
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Old 30th December 2014, 02:09 PM   #9
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I've been wondering the same thing... When it tries to turn on the wave looks to be forming O.K... I'm going to install the ps transistors and see how it goes. :fingers crossed:
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Old 30th December 2014, 06:24 PM   #10
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I installed all the ps transistors. Now the clipping LED blinks 16 times and tries to cycle, over and over. Here is a short video (sorry Perry, I know you don't like vids but its the best way I could show whats happening). I can hear one transformer or something around it ringing a few times while it tries to start up.

http://vid1047.photobucket.com/album...pssl4rdthi.mp4
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