What's this on my Oscilloscope LCD Screen ? Is it Fungus ?   - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 24, 2025, 01:24:10 pm
content: Hi,I have noticed that most of my test instrument seem to have some kind of white snowflake like growth on the LCD or behind the front glass. I'm afraid that it might damage the LCD. On my logic analyser there's already a black spot that doesn't seem to produce any colours. I noticed a similar white patch on my oscilloscope screen and some peculiar drawing like path too. Can you take a look at the photo ? looks like an evil spawn born out of white mass making a marking on my precious screen.

author: Gyro
author_rank: Super Contributor
timestamp: January 24, 2025, 01:50:10 pm
content: Aargh, the dreaded LCD fungus / Screen cancer again!https://www.eevblog.com/forum/beginners/why-i-do-not-like-fractals-on-my-lcd/https://www.eevblog.com/forum/repair/agilent-e4433b-odd-screen-problem-ever-seen-this-before/(images gone)I've seen a few references to polarizer eating (more likely adhesive eating) fungus too.

author: Fungus
author_rank: Super Contributor
timestamp: January 24, 2025, 06:27:08 pm
content: Not guilty

author: Gyro
author_rank: Super Contributor
timestamp: January 24, 2025, 06:55:21 pm
content: Quote from: Fungus on January 24, 2025, 06:27:08 pmI remembered those threads but it was hell finding them again, for obvious reasons!

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 24, 2025, 08:17:35 pm
content: How bad is it this ? Am I to expect doing some cleaning therapy ? Or should I altogether replace the organ infected with screen cancer ?

author: DaneLaw
author_rank: Frequent Contributor
timestamp: January 24, 2025, 09:18:03 pm
content: Quote from: electronic_guy on January 24, 2025, 01:24:10 pmThe black traces looks organic... almost like an insect.. feeding on some of the layered residue... the snowflake could resemble mold/fungus.. are you storing it in a humid/wet environment.?Quote from: Fungus on January 24, 2025, 06:27:08 pmThats exactly what a guilty Fungus would say.

author: Martin72
author_rank: Super Contributor
timestamp: January 24, 2025, 10:09:03 pm
content: Quote from: DaneLaw on January 24, 2025, 09:18:03 pmIt looks like the typical residue left behind when a sharp object has damaged the display glass.In that case, the other traces are not surprising either.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: January 24, 2025, 11:02:21 pm
content: Quote from: Martin72 on January 24, 2025, 10:09:03 pmit would be something if they ALL suddenly had encountered a "sharp object" out of the blue, as OP does emphasize the fact that it's the same situation on most of his items.Quote from: electronic_guy on January 24, 2025, 01:24:10 pmIt does look like the start of a screen mold-fungus-spore, not least if OP is now seeing the same behavior on most of his other items and their displays.when it goes really sour.. it can tarnish most of the screen.

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 26, 2025, 05:21:33 am
content: Quote from: DaneLaw on January 24, 2025, 09:18:03 pmActually I used a humidifier in the room I have kept them, because dry air is not well tolerated for me. Too bad I used it for almost a month. Didn't think it would affect this much because I kept the AC running while the humidifier is running.

author: Sorama
author_rank: Frequent Contributor
timestamp: January 26, 2025, 09:44:01 am
content: How much is the relative humidity (%) in that room?I guess it’s way too high.

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 26, 2025, 06:17:58 pm
content: I don’t have a way to measure it

author: KungFuJosh
author_rank: Super Contributor
timestamp: January 26, 2025, 06:51:27 pm
content: Quote from: electronic_guy on January 26, 2025, 06:17:58 pmhttps://www.amazon.com/gp/product/B06XTPTG1J/