Rigol Image Burn (DP832A Triple Power Supply) - Page 1
Forum section: electronics / testgear

author: DA-N-NY
author_rank: Newbie
timestamp: June 08, 2023, 01:55:20 am
content: I just received a used DP832A that supposedly was in "Good Condition" but has significant screen burn in. See pic below. It was calibrated in summer of 22. Just a bit older than a new DP832A I already had (based on serial number). The burn-in is pretty significant and is of the "Normal" display option. I use the "Classic" display. I also noticed a constant white wash flicker. It's bad regardless of display settings (brightness, contrast etc) and included a pic against my newer one with the same settings. However, even looking closer at my new one, it looks like it is starting to suffer the same issue. I wonder if anyone experienced a similar problem with their equipment? I have mostly Siglent of which get a lot more use and have not noticed any burn in.Edit: The burnin issue is the second pic.Edit 2: I added another pic to show how washed out it looks from the top (but page displays the same thumbnail???) So you may have to click to view it correctly.

author: Fungus
author_rank: Super Contributor
timestamp: June 08, 2023, 02:35:00 am
content: Looks like they used an OLED screen in which case there's not much you can do except replace it.

author: RoGeorge
author_rank: Super Contributor
timestamp: June 08, 2023, 07:47:57 am
content: That's a defective LCD, maybe a bad contact somewhere, the image shouldn't look like an interlaced TV raster. If that's only remaining burns shadow, I think there is a screen saver feature, but I never used it. Mine doesn't show any remnant shadows, though it's used only rarely, for hobby projects, was never left on for more than a few days continuously.

author: tooki
author_rank: Super Contributor
timestamp: June 08, 2023, 09:01:36 am
content: Quote from: Fungus on June 08, 2023, 02:35:00 amLOL no.

author: DA-N-NY
author_rank: Newbie
timestamp: June 08, 2023, 02:48:50 pm
content: The shadow burn is the screen from the last user that used "Normal" mode for display. It's now burned in regardless of what is displayed. I am seeing my newer Rigol unit is starting to do the same after only maybe 50-100 hours of use. It's subtle and you would not see it unless you look for it. But given that the "burn in" is already started, I assume that it will get worse to the point of the used but "very good" condition of the other Rigol. Yes it has a screen saver and I just enabled it across all my Rigol equipment. I see it on the two DP832A's (one very faintly) but not on the DP821A or the DL3021 yet, although they should have more hours of use.

author: Fungus
author_rank: Super Contributor
timestamp: June 08, 2023, 03:56:23 pm
content: Quote from: tooki on June 08, 2023, 09:01:36 amSo what's your helpful explanation/fix?

author: Fungus
author_rank: Super Contributor
timestamp: June 08, 2023, 04:02:15 pm
content: Quote from: DA-N-NY on June 08, 2023, 02:48:50 pmYep, that much is obvious.If it's an LCD then itmightfix itself with time. The usual trick is to "exercise" the pixels by alternating between full white/full black for a while but that's going to be difficult to do on a power supply.The other option is to take it apart and look for a part number on the back of the screen. Google that number.Quote from: RoGeorge on June 08, 2023, 07:47:57 amYep. If it's "interlaced" then there's probably a bad cable or bad contact somewhere. Take the lid off and press/wiggle things.

author: bdunham7
author_rank: Super Contributor
timestamp: June 08, 2023, 04:53:44 pm
content: Quote from: Fungus on June 08, 2023, 02:35:00 amBurned in OLED or AMOLED screens (like my old Samsung Galaxy AMOLED phone) will be inverse images since the most-used OLED elements become dimmer. What is shown is some sort of LCD persistence, along with a pretty bad looking screen. Ordinarily I'd expect that to go away if you turned the unit off overnight. If it persists long term, my guess would be that Rigol used a particularly crappy LCD panel, which would be really annoying since it is pretty obvious how it is going to be used.

author: DA-N-NY
author_rank: Newbie
timestamp: June 09, 2023, 05:16:07 am
content: While the pictures I took could not capture all the issues, I am observing three as follows1) The burned in (Ghosting of) the "Normal" interface page.2) Very washed out display.3) Screen flicker which is hard to capture on camera.Think I will just return it to Amazon at this point.

author: tooki
author_rank: Super Contributor
timestamp: June 09, 2023, 09:08:25 pm
content: Quote from: Fungus on June 08, 2023, 03:56:23 pmI don’t have one.But unlike you I didn’t add misinformation, which is worse than adding nothing at all.