---
title: "LED Not active"
url: "https://maker.wiznet.io/forum/13551"
markdown_url: "https://maker.wiznet.io/forum/13551/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "kiazoo"
created: "2019-10-27T15:17:47+09:00"
last_activity: "2019-10-31T01:45:42+09:00"
language: "en"
views: 877
replies: 3
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# LED Not active

## Question

Asked by kiazoo on 2019-10-27 in Ethernet Chips.

Hello

I have a W5500 chip on my custom board. When i plug in the ETH cable the LED not blink both Link and Act.
I try to check follow this topic [Link LED - #2 by Coccoliso](https://forum.wiznet.io/t/topic/2152/2) check all bias resistor i can’t solve my ploblem.

Please check my schematic.

Thank you

[![Capture](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/3/3712f24fa3383361afb2317bb1b9f92d2dd0d302.jpeg) Capture1185×797 266 KB](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/3/3712f24fa3383361afb2317bb1b9f92d2dd0d302.jpeg)

## Replies

### Reply 1 by Eugeny, 2019-10-28

Would 1k resistors provide enough current for the LEDs to be lit?
Why 50 Ohms instead of required 49.9 1% Ohms? Are they 1%?
Why 6.8 picofarads instead of 6.8 nanofarads?
What “ferrite” is used here?
Is chip accessible through SPI?

### Reply 2 by scott, 2019-10-28

[@kiazoo](https://maker.wiznet.io/u/kiazoo)

Your capacitor is wrong.

6.8pF → 6.8nF

If we can fix this and the problem continues,

Your symptoms are caused by improper PCB design.

Did you refer to the design guide at the URL below?

<https://wizwiki.net/wiki/doku.php/design_guide:hardware:start>

Thank you.

### Reply 3 by kiazoo, 2019-10-31

Thank for all reply.

this case my MCU can access the W5500 chip. i use same controller and wire to W5500 module (i got it from alibaba) it 's work.
In circuit ferrite is 33Ohm. i use 50Ohm resistor because it’s best i can find in my local seller.
but capacitor is my wrong i will fix it first.

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Source: https://maker.wiznet.io/forum/13551