# Problem with ScrollPhat

**URL:** <https://forums.pimoroni.com/t/problem-with-scrollphat/4135>\
**Category:** Support\
**Created:** [March 3, 2017, 12:00am UTC](https://forums.pimoroni.com/t/problem-with-scrollphat/4135 "2017-03-03T00:00:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![KieranW](https://avatars.discourse-cdn.com/v4/letter/k/f14d63/32.png) [@KieranW](https://forums.pimoroni.com/u/KieranW)\
**Post date:** [March 3, 2017, 12:00am UTC](https://forums.pimoroni.com/t/problem-with-scrollphat/4135/1 "2017-03-03T00:00:35Z")

</div>

Hi there,

I’m having an issue with the ScrollPhat. I’ve read other replies and posts in the forums but no solutions have yet worked.

When I try to run any of the examples after installation (which all works fine) I get errors. Specifically, when running test-all.py I get:

> Traceback (most recent call last):  
> File “test-all.py”, line 7, in   
> import scrollphat  
> File “/usr/lib/python2.7/dist-packages/scrollphat/ **init**.py”, line 20, in   
> controller = IS31FL3730(smbus, font)  
> File “/usr/lib/python2.7/dist-packages/scrollphat/IS31FL3730.py”, line 21, in **init**  
> self.set\_mode(self.i2cConstants.MODE\_5X11)  
> File “/usr/lib/python2.7/dist-packages/scrollphat/IS31FL3730.py”, line 62, in set\_mode  
> self.bus.write\_i2c\_block\_data(self.i2cConstants.I2C\_ADDR, self.i2cConstants.CMD\_SET\_MODE, [self.i2cConstants.MODE\_5X11])  
> IOError: [Errno 5] Input/output error

I’ve double checked all pins (and yes, the header is soldered on!) and performed continuity checks but can’t find a problem.  
Is this usually a hardware or a software issue? And is there any other checks I should make?

Hope you can help!

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<div class="post-metadata">

**Author:** ![RogueM](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/roguem/32/311_2.png) [@RogueM](https://forums.pimoroni.com/u/RogueM)\
**Post date:** [March 3, 2017, 12:21am UTC](https://forums.pimoroni.com/t/problem-with-scrollphat/4135/2 "2017-03-03T00:21:33Z")

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what do you get if you run:

```
i2cdetect -y 1
```

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<div class="post-metadata">

**Author:** ![KieranW](https://avatars.discourse-cdn.com/v4/letter/k/f14d63/32.png) [@KieranW](https://forums.pimoroni.com/u/KieranW)\
**Post date:** [March 3, 2017, 12:26am UTC](https://forums.pimoroni.com/t/problem-with-scrollphat/4135/3 "2017-03-03T00:26:31Z")

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The answer is… not a great deal!

> ```
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 
> ```
> 
> 00: – – – – – – – – – – – – –  
> 10: – – – – – – – – – – – – – – – –  
> 20: – – – – – – – – – – – – – – – –  
> 30: – – – – – – – – – – – – – – – –  
> 40: – – – – – – – – – – – – – – – –  
> 50: – – – – – – – – – – – – – – – –  
> 60: – – – – – – – – – – – – – – – –  
> 70: – – – – – – – –

Whilst troubleshooting something else I may have discovered that my multi-meter is playing up and giving me false continuity readings… what are the chances that my headers not connected at all…?

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<div class="post-metadata">

**Author:** ![KieranW](https://avatars.discourse-cdn.com/v4/letter/k/f14d63/32.png) [@KieranW](https://forums.pimoroni.com/u/KieranW)\
**Post date:** [March 3, 2017, 12:33am UTC](https://forums.pimoroni.com/t/problem-with-scrollphat/4135/4 "2017-03-03T00:33:44Z")

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I just discovered I may be a royal idiot.

Since the fit was quite snug and it didn’t add/remove easily I assumed the male pins were fine to connect to the female pins easily…

What I didn’t account for is the short ends of the pins probably weren’t long enough to connect to the female pins!

Sorry for wasting your time!

Lesson learnt - measure twice, solder once.