---
title: "Bad batch of W5500 shields"
url: "https://maker.wiznet.io/forum/13328"
markdown_url: "https://maker.wiznet.io/forum/13328/md"
type: "Forum topic"
category: "General"
author: "rasetten"
created: "2019-05-17T21:45:08+09:00"
last_activity: "2019-05-21T00:35:25+09:00"
language: "en"
views: 873
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Bad batch of W5500 shields

## Question

Asked by rasetten on 2019-05-17 in General.

I’ve got a batch of W5500 shields (1826) that I recently purchased that fail to create a link with certain switches. I tried removing R17 from the board, which should disable auto-negotiation, but that didn’t work. I have a few from what I believe is batch 1836 that work perfectly fine with the same networking equipment. What changed?

## Replies

### Reply 1 by scott, 2019-05-21

Hi rasetten

Is there a difference between the 1826 and 1836 board versions?

If there is no board version difference, there is no change.

Thank you

Scott

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Source: https://maker.wiznet.io/forum/13328