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Rigol DHO800/900 new firmware... 1.03

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Moduvator:
I think I might be on to something. I have not cold booted the scope yet, having obtained the above pictures, and this time I was able to reliably reproduce that ghost logo after just some 40 minutes of sleep. This time you can even make out the spinner it shows as the system goes to sleep.

Overall it does seem you need a few sleep-wake cycles for it to manifest but once triggered it would then happen every time.

Fungus:
Looks like some sort of "transient image persistance".

https://en.wikipedia.org/wiki/Image_persistence

AFAIK it's not permanent on LCDs.

Moduvator:

--- Quote from: Fungus on December 10, 2024, 01:58:02 am ---AFAIK it's not permanent on LCDs though.

--- End quote ---
It would depend on how long the display is left in that state. Seems that when the OS enters sleep, the display refresh circuitry is switched off but whatever image was last in the buffer is still actively driving the pixels, causing them to be stuck like this. If that is true this could eventually permanently polarize the liquid crystals if left alone for long enough -- this is why drive LCDs with AC...
Here it seems that the charges also slowly "bleed" into surrounding pixels the longer the scope is left in sleep, explaining that 'halo effect' we saw earlier. Since this does not happen every time and certainly not between cold boots, this leads me to suspect it's a software/firmware issue...

I stand to be corrected =)

norbert.kiszka:
Maybe somebody missed, but long time ago I shared here my reverse engineering (and modification) of this "sleep mode". In this state, app is killed and modules are unloaded. One added module in 1.03 when is unloaded, it switches off only one CPU GPIO output - that causes both fan and the screen to turn off.

I did this reverse engineering only on software side. So I don't know where this pin is connected.

fearas38:
I checked SMB on the new firmware. It works perfectly with LAN, but it doesn't work via WiFi. Does anyone know why?

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