MPLAB-SNAP schematic - Page 1
Forum section: electronics / repair

author: up8051
author_rank: Frequent Contributor
timestamp: July 25, 2022, 09:41:14 pm
content: Unfortunately, today I damaged it, the voltage of 12V was applied to the VDD target pin.The U12 system is definitely damaged, it is very hot (C045 marking code, SN74LVC1G04DBVR)Is anybody have schematic for MPLAB- SNAP debugger?BR JarekC

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: July 26, 2022, 11:40:56 pm
content: U12 or U2I don't see U12.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: July 26, 2022, 11:52:06 pm
content: 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-Q1Maximum 6.5 V supply... so fried for sure. Magic smoke too???

author: up8051
author_rank: Frequent Contributor
timestamp: July 27, 2022, 05:09:51 pm
content: 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 codeV5

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: July 27, 2022, 05:28:04 pm
content: Low price debugger. Probably not worth to repair. Just BANO... Buy A New One.

author: voltsandjolts
author_rank: Unknown
timestamp: July 27, 2022, 05:31:14 pm
content: Quote from: up8051 on July 27, 2022, 05:09:51 pmThey 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.

author: up8051
author_rank: Frequent Contributor
timestamp: July 27, 2022, 05:57:27 pm
content: Quote from: voltsandjolts on July 27, 2022, 05:31:14 pmRather, they are the bidirectional buffer.Case TSOP-6Probably 74LVC1T45A fragment of the diagram found in:https://ww1.microchip.com/downloads/en/DeviceDoc/ETN36_MPLAB%20Snap%20AVR%20Interface%20Modification.pdf

author: voltsandjolts
author_rank: Unknown
timestamp: July 27, 2022, 06:00:40 pm
content: Hah, OK, my bad.Don't believe everything you read on the internet, especially if it's by me!

author: up8051
author_rank: Frequent Contributor
timestamp: July 27, 2022, 06:06:11 pm
content: Nexperia 74LVC1T45GW-Q100 Marking Code V5 case SC-88/SOT363

author: up8051
author_rank: Frequent Contributor
timestamp: July 27, 2022, 06:26:20 pm
content: Quote from: SoundTech-LG on July 27, 2022, 05:28:04 pmIt was cheap in the beginning now it costs with shipping around $ 50

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: July 28, 2022, 11:01:04 pm
content: It's all relative...https://www.amazon.com/MICROCHIPMICROCHIP-DV007004-MPLAB-PM3-PROGRAMMER-DSPIC30F/dp/B08Z8445QL/ref=sr_1_13?keywords=mplabs&qid=1659048988&sr=8-13

author: radit68i
author_rank: Newbie
timestamp: June 22, 2025, 08:43:11 am
content: This is a brand new MPLAB PG164100. Is it normal for the main microcontroller ATSAME70N21 to reach around 50C, only the usb port is connected?