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>
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.
On Wed, 14 Aug 2024 14:26:48 -0700, Jeff Liebermann <jeffl@cruzio.com> wrote:
Eeuuwww. Pure guess ....
One of the voltages on the display tube itself has gone off. Right orff.
Could be that a cap has broken down.
But in a very worst case, a weld inside the display tube has opened up.
Ummm... it's not a CRT. It's a color LCD 640x480 panel.
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>
On Wed, 14 Aug 2024 20:55:27 -0400, legg <legg@nospam.magma.ca> wrote:
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.
I'm fearless and moderately careful. My problem is that I'm in the
process of purging all the old junk from my house. When I retired and
closed the office, I had to drag everything from the office to the
house. The house has been a mess since Sept 2020. I have quite a bit
of equipment that I know can be fixed if I had the time and bench
space. For this DSO, the problem is both lack of time and lack of
bench space. I can't just tear it apart and leave it. The reason I
asked for clues is to save time monopolizing the workbench and >troubleshooting the problem. In this case, I've seen literally
hundreds of failed LCD computers displays, but none have ever looked
like the photograph.
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 DSO is old enough that a bad electrolytic is a likely problem. I >couldn't find any information that would help establish the age. So,
I measure a few voltages. If that fails, I find where my ESR tester
is hiding and check every electrolytic.
The bloom around the LCD display looks physical, to me.
There's no evidence of a crack in the display.
As a battery-powered device, it'll have it's uses.
It has an AC charger and power supply built in. The battery pack is >proprietary. I plan to use the AC PS for testing and to build a
suitable battery pack when it's fixed.
Incidentally, I used it for about a year before it suddenly quit. It's
only 20MHz bandwidth, but that was good enough for audio.
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.
That's a much later 200MHz DSO: ><https://www.saelig.com/product/PSBEB100007.htm>
The previous owner of my PDS5022s mentioned that overcharging the
battery was also a problem. If it used LiIon and there was no BMS, I
would not expect the battery to last very long. I have a few devices
have no battery protection or balancing. When possible, I add the
necessary circuitry. More commonly, I just bring out all the internal >battery connections to a balancing connector and use a radio-control
style external charger. I have one of these which will charge almost
any battery: ><https://hobbyking.com/en_us/skyrc-imax-b6-v2-60w-6a-1-6s-dc-charger-discharger.html>
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>
Video of a Digimess DS25 DSO, which is similar to my Owon PDS5022s: ><https://www.youtube.com/watch?v=yfjh0KDEaTY>
The plastic case, front panel, and oscilloscope section are identical. >However, the LCD panel, power supply and backlighting inverter are
very different.
More videos:
This PDS5022S video is 14 year old with upgraded firmware: ><https://www.youtube.com/watch?v=JQtvW1wpl6w>
More of the same:
<https://www.youtube.com/shorts/6OCnuXpM2mY> (same problem as mine) ><https://www.youtube.com/watch?v=M0galCMhm7U> ><https://www.youtube.com/watch?v=nydo6xsLY7g> ><https://www.youtube.com/watch?v=hzZpE9yrMKA> ><https://www.youtube.com/watch?v=UInlOkFDf24> (shows defective LCD) ><https://www.youtube.com/watch?v=X1OTPt7_1Z8> ><https://www.youtube.com/watch?v=1sUGiwaEjq8> (shows defective LCD) ><https://www.youtube.com/watch?v=xHaapgrXxYI> ><https://www.youtube.com/watch?v=escwIX0vY64> (looks similar to mine) ><https://www.youtube.com/watch?v=EQXzP6sazaA> ><https://www.youtube.com/watch?v=MNzaAPetnVw> ><https://www.youtube.com/watch?v=K3mITKGuAW4> ><https://www.youtube.com/watch?v=bjRQP8mDCV0>
Some photos of the internals:
<https://photos.app.goo.gl/ZgCRUB4SChDYRrRy6>
When I removed the cover, I was immediately hit with the distinctive
smell of burned resistor. I tried to find the source with my nose,
but failed. When I "fire" it up again, I'll do some more fault
"sniffing".
Visual inspection didn't find anything that looked like a problem. I
tested all the electrolytics with an ESR tester. I did another visual >inspection with a microscope: ><https://www.learnbydestroying.com/jeffl/pics/microscopes/Olympus%20SZ30/SZ30-01.jpg>
No problems found.
I think it's the LCD panel. There are replacement LCD's on Ali
Express and eBay for about $140. However, the scope is selling on
eBay for about the same price. ><https://www.ebay.com/sch/i.html?_nkw=owon+pds5022s>
This one has the same problem as mine: ><https://www.ebay.com/itm/285811299516>
If the DSO doesn't magically fix itself in the next few days, it's
going to the local recycler.
On Thu, 15 Aug 2024 20:34:51 -0700, Jeff Liebermann
<jeffl@cruzio.com> wrote:
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-pd >>s5022s.htm
Video of a Digimess DS25 DSO, which is similar to my Owon PDS5022s: ><https://www.youtube.com/watch?v=yfjh0KDEaTY>
The plastic case, front panel, and oscilloscope section are identical. >However, the LCD panel, power supply and backlighting inverter are
very different.
More videos:
This PDS5022S video is 14 year old with upgraded firmware: ><https://www.youtube.com/watch?v=JQtvW1wpl6w>
More of the same:
<https://www.youtube.com/shorts/6OCnuXpM2mY> (same problem as mine) ><https://www.youtube.com/watch?v=M0galCMhm7U> ><https://www.youtube.com/watch?v=nydo6xsLY7g> ><https://www.youtube.com/watch?v=hzZpE9yrMKA> ><https://www.youtube.com/watch?v=UInlOkFDf24> (shows defective LCD) ><https://www.youtube.com/watch?v=X1OTPt7_1Z8> ><https://www.youtube.com/watch?v=1sUGiwaEjq8> (shows defective LCD) ><https://www.youtube.com/watch?v=xHaapgrXxYI> ><https://www.youtube.com/watch?v=escwIX0vY64> (looks similar to mine) ><https://www.youtube.com/watch?v=EQXzP6sazaA> ><https://www.youtube.com/watch?v=MNzaAPetnVw> ><https://www.youtube.com/watch?v=K3mITKGuAW4> ><https://www.youtube.com/watch?v=bjRQP8mDCV0>
Some photos of the internals:
<https://photos.app.goo.gl/ZgCRUB4SChDYRrRy6>
When I removed the cover, I was immediately hit with the distinctive
smell of burned resistor. I tried to find the source with my nose,
but failed. When I "fire" it up again, I'll do some more fault
"sniffing".
Visual inspection didn't find anything that looked like a problem. I
tested all the electrolytics with an ESR tester. I did another visual >inspection with a microscope: ><https://www.learnbydestroying.com/jeffl/pics/microscopes/Olympus%20S >Z30/SZ30-0
1.jpg>
No problems found.
I think it's the LCD panel. There are replacement LCD's on Ali
Express and eBay for about $140. However, the scope is selling on
eBay for about the same price. ><https://www.ebay.com/sch/i.html?_nkw=owon+pds5022s>
This one has the same problem as mine: ><https://www.ebay.com/itm/285811299516>
If the DSO doesn't magically fix itself in the next few days, it's
going to the local recycler.
They're doing no-one any favors by making service info and
replacement parts unavailable.
Even so, stocking lcd displays for ten year gone product is
probably asking a bit much. Imagine if they did?
There's nothing particularly special about their circuitry, that
needs protection. It's all in the firmware. What needs protection
is the end user.
If the DSO doesn't magically fix itself in the next few days, it's
going to the local recycler.
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