Arduino not communicating with computer

Development Tools Uploading
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I am using a Arduino Uno r3 for my project , yesterday I accidently powered my Arduino with 13v through the power jack of Arduino board and after few seconds the microcontroller started heating up and board got hot. then I unplugged my Arduino and today I tried to connect Arduino to my laptop to upload code but it turned off within 5 seconds of power up and also it got hot even when powered through laptop USB port. Then I removed the board and after few hours again plugged in LAPTOP, it powered up well without turning off by itself . Then the on board led pin 13 was not blinking while connected to laptop and it showed this error while I tried to upload my code. And I am sure there is no damage to the voltage regulator or any capacitors of the board, everything looks fine in the board. can any one help.


Sketch uses 22798 bytes (70%) of program storage space. Maximum is 32256 bytes.

Global variables use 904 bytes (44%) of dynamic memory, leaving 1144 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xab

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xab

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xab

avrdude: stk500_recv(): programmer is not responding
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The quick reply: buy another one.

The long reply:

13V on the barrel should be OK assuming it's DC. What was all connected to the board when the accident happened?

If this is an Uno with 16U2 TTL-to-USB chip, try the loopback test first. If that fails, the 16U2 died and unless you can solder SMD components, it's the end.
If the loopback test is successfull, the likely culprit is the 328P (I assume that that is the one that got hot); if it's the DIP version you can buy a new one (buy one preloaded with bootloader).

How do you know?

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Nothing in the board looked fried,burnned or damaged to naked eye.
The board worked fine with every components and programme for a month, it got heating issue only after tha power issue .
Yes its the dip version with 328p.
Can anyone tell Why did it got damaged and
What should i do in future to avoid this problem.

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IMG_20210428_051556_265
IMG_20210428_051556_2654608×3456 3.64 MB
this is my adruino

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That does not mean anything.

If the Arduino is still recognised by your OS, remove the 328P, connect RX and TX together, start Serial Monitor, send something to the Arduino and check if you get the same data that you typed back in the serial monitor. If that works, buy a new 328P (with bootloader pre-installed).

I doubt it.

Your board should have survived if it was 13V DC and nothing else was connected. But mixing 5V and 12V (13V) seems to be risky at times. I use 9V adapters specifically for this.

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