Video Blog 175 - HP3457A Multimeter TFT Conversion

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Published: Thursday, 05 February 2026

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DISCLAIMER: This video is educational only, so if you decide to do the same yourself then you are on your own, I can't be held responsible for any problems/issues/damage/injury that may occur if you decide to follow this blog and try it yourself.

VIDEO BLOG

Off the back of my recent ADCMT SMU TFT conversion I thought i'd take a look at trying to do the same on my 3457A.

The PCB gerbers, BOM & instructions - https://www.ianjohnston.com/misc/3457A_TFT_Conversion.zip
Where it all started - https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/
XI's Protocol post - https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/msg1347268/#msg1347268
GIT source - https://www.ianjohnston.com/index.php/videos/video-blog-175-3457a

Update 07/07/26:
Hex file updated - Fixed bug related to sending data to the LT7680 Pcb. Also, added speed test at boot to check for fake/slow BluePill boards.

YouTube Video: