Re: Owon PDS 5022S

On Wed, 14 Aug 2024 14:26:48 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:

A few years ago, my Owon PDS 5022S oscilloscope failed with a strange
looking display.  See photo at:
<https://photos.app.goo.gl/rYGeaGygSMXHtMCb8>
From what is visible on the display, everything seems to be working
except for the strange display.  Whatever is wrong is probably in
either the color LCD display or the circuitry that drives the display.
Does anyone have a clue what might have failed?  Mostly, I'm trying to
save time fixing it.  (I haven't torn it apart yet).
>
User manual (no schematic or block diagram):
<https://www.saelig.com/downloads/pds5022s.pdf>
Specs:
<https://www.batronix.com/shop/oscilloscopes/digital-oscilloscope-pds5022s.html>

Don't be afraid to open it up, just be carefull.

Could be something simple. I had a TDS210 that was shipped with a
 reversed and burst electrolytic. Worked fine for a while before
requiring a simple fix. Display showed first symptoms.

The bloom around the LCD display looks physical, to me.

As a battery-powered device, it'll have it's uses.

I have a few Owon SDS8202s that are eating their batteries
regularly. I've introduced balancing, internally, but the
charging circuit possibly overvolts the battery chemistry.
Simple is good, but ignoring the float upper limit is just
stupid.

RL