# Duet 3 Mini 5+ Max31855 Thermocouple board broken, bad Printer.cfg or otherwise? **URL:** \ **Category:** General Discussion\ **Created:** [June 14, 2024, 3:05pm UTC](https://klipper.discourse.group/t/duet-3-mini-5-max31855-thermocouple-board-broken-bad-printer-cfg-or-otherwise/17042 "2024-06-14T15:05:28Z")\ **Posts on this page:** 1\ **Showing post:** 11
**Author:** ![Sev7](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@Sev7](https://klipper.discourse.group/u/Sev7)\ **Post date:** [June 15, 2024, 1:19pm UTC](https://klipper.discourse.group/t/duet-3-mini-5-max31855-thermocouple-board-broken-bad-printer-cfg-or-otherwise/17042/11 "2024-06-15T13:19:56Z")
Hey Rex, 1. I purchased the daughter board from E3D who state that the board sold is the old MAX31855 chip. See photo ![DSC_0253_edit](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/9/9fd415ea93ba2e07d033b412704fc5cc3ced25c2.jpeg) . 2. Yes, I saw this in another post here [https://klipper.discourse.group/t/duet-rtd-thermocouple-daughter-card-configuration/5549](https://klipper.discourse.group/t/duet-rtd-thermocouple-daughter-card-configuration/5549) and I have disabled it, see attached [printer.cfg](https://klipper.discourse.group/uploads/short-url/xszRXdx9Q3sQA1qQ2WMPq36wvHE.cfg) (4.2 KB) Yes I have renamed it to tc\_disable, I am pretty sure you can type any name here though? I have tried both terminals on the daughter board and I have tried swapping the thermocouple wires within each terminal as well. I noticed that the daughter board layout for the MAX31855 is exactly the same for the MAX31856, I am tempted to solder new MAX31856 chips onto my board to get the noise filtering. I don’t think anything should be making noise though, I am using a decent power supply. I have tried disconnecting everything but the bare essentials, to see if this was the issue. --- _[View the full topic](https://klipper.discourse.group/t/duet-3-mini-5-max31855-thermocouple-board-broken-bad-printer-cfg-or-otherwise/17042)._