IC only works when I place my finger on it but had no issues 8 months ago. Possible causes?

A

Ammar Yasir

CONTEXT:

I made this PCB and all worked perfectly 10 months a go. Here’s an image just to give you a better idea:

PCB I made for my timer

I replaced the batteries (3 AAAA batteries to be exact) and noticed that display wasn’t working unless I touched the shift register (the ones hooked to C5 and C6 respectively) with my finger.

Based on some quick research , this seems to be a noise issue (link down below)

UPDATED CONTEXT & QUESTION:

Initially this post was about me thinking it was a capacitor issue which led to noise in the IC but the capacitors are fine! However, I am once again unsure the cause of this "only works when finger on IC" issue.

ADITIONAL RESOURCES BASED ON FEEDBACK:


  1. Here is a the main reddit post I used as part of my "research" which led me to believe it is a noise issue because he didn't have a bypass capacitor and I had thought my capacitor was broken upon initial readings (turned out I used a wrong method of reading the capacitor value)


  2. Here is an image of the schematic of my PCB. Unchanged from one of my earlier posts: enter image description here


  3. A video link showcasing how my finger makes the timer work. Note that the power source used here is from a 5V 1Amp socket and goes via a TP4056 charge module
 

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