user29773: Recently I have unsoldered most connector pins there are on the arduino uno board.
However, when I now attempt to upload a new sketch (works when I upload it to another model) it gives me the following error:
> avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xfa

I would like you take a look at my arduino board to see whether I have unsoldered important pins which might have to be connected.
Also when I try to upload a new sketch the 'L'-LED doesn't flash but the RX one.
(BTW: Yes I've set the settings to the correct board, port etc...)

Thanks for any solution attempts!

user28569: Removing there pin headers should not cause any sketch upload issue. I have done it many times.
You did try uploading BEFORE unsoldering the headers right ?
However looking at the desoldering job you did, my guess is that you applied too much heat or cut a trace on the PCB while doing it.
Can you upload a high resolution of the back side of the board?
What I would try is to take a known good 328p chip and replace the one on this board with it and try uploading again.

29773: <p>Recently I have unsoldered most connector pins there are on the arduino uno board.
However, when I now attempt to upload a new sketch (works when I upload it to another model) it gives me the following error:</p>

<pre><code>&gt; avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xfa
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xfa
</code></pre>

<p>I would like you take a look at my arduino board to see whether I have unsoldered important pins which might have to be connected.</p>

<p>Also when I try to upload a new sketch the 'L'-LED doesn't flash but the RX one.</p>

<p>(BTW: Yes I've set the settings to the correct board, port etc...)</p>

<p><a href="https://i.stack.imgur.com/8Ajo5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8Ajo5.jpg" alt="enter image description here"></a></p>

<p>Thanks for any solution attempts!</p>
 28569: <p>Removing there pin headers should not cause any sketch upload issue. I have done it many times.</p>

<p>You did try uploading BEFORE unsoldering the headers right ?</p>

<p>However looking at the desoldering job you did, my guess is that you applied too much heat or cut a trace on the PCB while doing it.</p>

<p>Can you upload a high resolution of the back side of the board?</p>

<p>What I would try is to take a known good 328p chip and replace the one on this board with it and try uploading again.</p>
