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Author Topic: MPLAB-SNAP schematic  (Read 1757 times)

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Online up8051Topic starter

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MPLAB-SNAP schematic
« on: July 25, 2022, 09:41:14 pm »
Unfortunately, today I damaged it, the voltage of 12V was applied to the VDD target pin  |O.
The U12 system is definitely damaged, it is very hot (C045 marking code, SN74LVC1G04DBVR)
Is anybody have schematic for MPLAB- SNAP debugger?

BR JarekC
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Offline SoundTech-LG

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Re: MPLAB-SNAP schematic
« Reply #1 on: July 26, 2022, 11:40:56 pm »
U12 or U2 ???  I don't see U12.
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Offline SoundTech-LG

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Re: MPLAB-SNAP schematic
« Reply #2 on: July 26, 2022, 11:52:06 pm »
Oops...  now I do see it. That's an inverter...   https://www.ti.com/lit/ds/symlink/sn74lvc1g04-q1.pdf?ts=1658879193779&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSN74LVC1G04-Q1

Maximum 6.5 V supply... so fried for sure. Magic smoke too???
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Online up8051Topic starter

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Re: MPLAB-SNAP schematic
« Reply #3 on: July 27, 2022, 05:09:51 pm »
Without magic smoke.

The measured resistance between GND and 3.3V was only 18 Ohm.

U8,U9 U7 were hot.
So I desoldered U6, U7, U8, U9, U10.
Now SNAP is visible by Microchip Studio.

But I can' identify this chips : marking code V5
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Offline SoundTech-LG

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Re: MPLAB-SNAP schematic
« Reply #4 on: July 27, 2022, 05:28:04 pm »
Low price debugger. Probably not worth to repair. Just BANO...  Buy A New One.
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Offline voltsandjolts

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Re: MPLAB-SNAP schematic
« Reply #5 on: July 27, 2022, 05:31:14 pm »
Quote from: up8051 on July 27, 2022, 05:09:51 pm
But I can' identify this chips : marking code V5

They are TVS protection diodes of some sort, you can likely remove them all and board will work...for testing anyway.

The PDWL050019 low capacitance TVS diode array is marked V05 but I don't think that is the correct device for you, judging by the connections in picture above. But it will be something like it.
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Online up8051Topic starter

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Re: MPLAB-SNAP schematic
« Reply #6 on: July 27, 2022, 05:57:27 pm »
Quote from: voltsandjolts on July 27, 2022, 05:31:14 pm
Quote from: up8051 on July 27, 2022, 05:09:51 pm
But I can' identify this chips : marking code V5

They are TVS protection diodes of some sort, you can likely remove them all and board will work...for testing anyway.

The PDWL050019 low capacitance TVS diode array is marked V05 but I don't think that is the correct device for you, judging by the connections in picture above. But it will be something like it.

Rather, they are the bidirectional buffer.
Case TSOP-6
Probably 74LVC1T45

A fragment of the diagram found in:
https://ww1.microchip.com/downloads/en/DeviceDoc/ETN36_MPLAB%20Snap%20AVR%20Interface%20Modification.pdf

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Offline voltsandjolts

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Re: MPLAB-SNAP schematic
« Reply #7 on: July 27, 2022, 06:00:40 pm »
Hah, OK, my bad.
Don't believe everything you read on the internet, especially if it's by me!
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Online up8051Topic starter

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Re: MPLAB-SNAP schematic
« Reply #8 on: July 27, 2022, 06:06:11 pm »
Nexperia 74LVC1T45GW-Q100  Marking Code V5 case SC-88/SOT363
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Online up8051Topic starter

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Re: MPLAB-SNAP schematic
« Reply #9 on: July 27, 2022, 06:26:20 pm »
Quote from: SoundTech-LG on July 27, 2022, 05:28:04 pm
Low price debugger. Probably not worth to repair. Just BANO...  Buy A New One.

It was cheap in the beginning now it costs with shipping around $ 50
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Offline SoundTech-LG

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Re: MPLAB-SNAP schematic
« Reply #10 on: July 28, 2022, 11:01:04 pm »
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