mpgmike
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Is there an ICD4 schematic available?
I screwed up & let some smoke out. I pulled my ICD4 apart and found physical damage to a component labeled FB3, which looks like a capacitor. Before I spend $250 for a replacement, I'd like to see if replacing that one part fixes mine. Help appreciated.
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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mbrowning
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Re: Is there an ICD4 schematic available?
2020/11/20 07:43:00
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 07:47:49
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You better post a photo of the component in doubt.
Capacitors usually come unmarked and have a low number of colors, so I doubt it's a cap.
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 07:50:49
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Thanks. I knew they handled warranty replacements, but never thought to just ask such a question. Query submitted.
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 08:15:17
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Here is a picture:  Or maybe not. Now that I think about it, I don't remember ever uploading a picture to this site...
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 08:37:55
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Uploading to this site DOES work (for alimited number of extensions).
Anyway - sharing via g..gl. did work.
But I cannot zoom in enough. Would you please provide a close(r)-up of the component?
A very first diagnosis - provided the arrow is meant to point to the black component with the white bar: looks like some diode. You'd better start checking for overvoltages in your target system right now.
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 09:27:30
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I know what I did wrong, it was entirely my fault. I was just hoping I could fix it on the cheap (after all, I work with electronics). FB3 has no markings, like a capacitor. That's about as good as I can get with my camera.
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 09:34:00
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"FB3" is on the silkscreen?
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 09:40:34
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If you applied some overvoltage, the fancy black devide with the white bar might be short or open.
If short, I'd expect it to be a transzorb/zener diode. If open, a simple diode. (Caps rarely blow in a decently designed circuit.)
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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crosland
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Re: Is there an ICD4 schematic available?
2020/11/20 09:45:23
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More likely a ferrite bead if they use sensible reference designators. AT a pinch you could probably replace with a wire link but noise immunuty may suffer somewhere.
Otherwise, raise a ticket and say its broken. Chances are you will get a new one.
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 10:15:00
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FB3 is silk screened.
It reads 135 ohms (it's in parallel with C121 cap).
Already raised a ticket, but admitting fault. I requested a part number/value for FB3. Worst case, I'll buy a new one. I wouldn't expect Microchip to pay for my stupidity.
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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NKurzman
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Re: Is there an ICD4 schematic available?
2020/11/20 10:19:03
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They will most likely replace it so I wouldn’t start repairing it until you’re sure they won’t.
Unfortunately they will not charge you so he will have to live with the guilt.
I agree an FB designator sounds like ferrite bead.
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 10:24:59
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Ferrite bead not open? Hardly the component that let the magic smoke out.
And if the cap is not shorted, the fault is to be found somewhere else.
BTW: what was the fault calling the desaster?
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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NKurzman
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Re: Is there an ICD4 schematic available?
2020/11/20 10:40:33
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I think you’re right 135 ohms might be normal for a ferite bead. Even if it was discolored by heating.
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MHS
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Re: Is there an ICD4 schematic available?
2020/11/20 12:35:07
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NKurzman
Unfortunately they will not charge you so he will have to live with the guilt.
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 13:22:00
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I was working on a board with 2 different levels of ground. During initialization both grounds are at the same potential. Then they part ways. I'm using 3 PICs; 2 at power supply ground, and a third on the floating ground. I was connected to this 3rd PIC for debugging, and when the grounds parted ways, -------- POOF! I assumed my laptop had a floating ground (battery powered, even though I had it plugged into the charger). I assumed the power supply has an isolated ground from earth ground (will have to check that one). And I assumed the ICD4 would buffer any discrepancies. You know what they say about when you assume; you make an ASS out of U & ME. (ASS-U-ME).
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 13:37:20
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Oops.
Motor drive, digital power supply or ???
So either some protection device(s) or some input(s) and/or output(s) might be blown
That's where one of the rare "USB isolators" comes really handy.
Haven't yet had to debug an isolated PIC, but you can bet your ass that I won't go without debug line isolation - protecting me as well as my assets.
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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mpgmike
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Re: Is there an ICD4 schematic available?
2020/11/20 13:42:48
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Oh, yea. I had a USB Hub/isolator in place that fried as well. At least my laptop USB port still works.
I don't need the world to know my name, but I want to live a life so all my great-grandchildren proudly remember me.
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du00000001
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Re: Is there an ICD4 schematic available?
2020/11/20 14:02:35
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Hub or really an isolator?
I wouldn't expect a real (electrical) isolator to fry. While a hub ...
PEBKAC / EBKAC / POBCAK / PICNIC (eventually see en.wikipedia.org)
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Antipodean
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Re: Is there an ICD4 schematic available?
2020/11/20 17:23:31
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mpgmike
You know what they say about when you assume; you make an ASS out of U & ME. (ASS-U-ME).
No, it is worse than that. Where is the U? It is in front of ME, so you make an ASS out of U in front of ME ... LoL:  LoL:
Do not use my alias in your message body when replying, your message will disappear ... Alan
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