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Upgrading Mainboard in Lecroy DDA-3000 (aka WavePro 7300a?)

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georgo:
I am still struggeling with my front panel ... following the drunken man anti-method I did swap the SuperIO LPC47N227 to check if this helps...
Unfourtunatly I only got chips with 0,4mm pitch instead of the used 0,5mm pitch on the PCB -> so I had to design a adapter around this issue. Attached you find a pic of the 100lqfp 0,4 -> 0,5mm pitch adapter. (Note: I did sand the bottom of the adater so that only the galvanized vias remained and I also sanded all edges so that the half-via provided the needed edge contacts.

But the situation is exactly the same as before -> so my guess the SuperIO could be faulty was wrong.

I did however achieve limited success with the LEDs on the frontpanel - The LEDs are driven by two 74HC594 shift-registers and by forcing the STR/ (storage register reset) to passive (pulling up Pin13 via 10k to 3v3 and excluding the Line 8 from the FFC ) the frontpanel Leds start working. And changes like channel trace on/off are properly reflected by the LEDs.

So now I got working Leds but the buttons/rotary encoders are still not working ..

As always if someone has a hint for me how to proceed, I am happy to take your advice.

georgo:
Happy New Year to everyone !!

I just want to keep you in the loop that my frontpanel is working again. Big thanks to ingowien! The failure was a bit unexpected, because it was not caused by the drivers, nor the frontpanel itself or the pci aquisition card. The failure is located somewhere on the Fan-Controller Card. The ribbon cable that connects the Fan-Controller to the Frontpanel (on J4) also carries an active-low Signal (Pin 4) that seems to act as "Disable Frontpanel". For some reason this signal was never released on my Scope.

During debugging I noticed that the J4 connector was not properly seated - I just reseated it and did not think much about this. This issue might either have damaged my FAN-Controller or it was the reason while the scope was working at the beginning (cause Pin4 did not made any contact)

Anyhow my fix was to cut the disable line on the Frontpanel PCB - there is anyhow a 10k pull-up in place that assures a proper state. (see picture attached).

During the debugging session I partially reveresed the frontpanel (this can be found here: https://github.com/ottingerg/lecroy_mfp415

I did not investigate what failed on the FAN-Controller, cause I am happy with the solution i found - It does have however one little drawback: After exiting the scope Application the LEDs stay lit. (but for me that is perfectly acceptable)

Thanks to everybody who helped me out with ideas how to fix my frontpanel. best wishes

Converter:

--- Quote from: georgo on January 01, 2021, 10:23:35 am ---Happy New Year to everyone !!

I just want to keep you in the loop that my frontpanel is working again. Big thanks to ingowien! The failure was a bit unexpected, because it was not caused by the drivers, nor the frontpanel itself or the pci aquisition card. The failure is located somewhere on the Fan-Controller Card. The ribbon cable that connects the Fan-Controller to the Frontpanel (on J4) also carries an active-low Signal (Pin 4) that seems to act as "Disable Frontpanel". For some reason this signal was never released on my Scope.

During debugging I noticed that the J4 connector was not properly seated - I just reseated it and did not think much about this. This issue might either have damaged my FAN-Controller or it was the reason while the scope was working at the beginning (cause Pin4 did not made any contact)

Anyhow my fix was to cut the disable line on the Frontpanel PCB - there is anyhow a 10k pull-up in place that assures a proper state. (see picture attached).


--- End quote ---

Hi georgo,

I faced the same problem when I upgraded the stock motherboard to AIMB-582. I have traced the circuit that connects the 3.3V enable level to the ground in the Frontpanel module. This is done by one of the "reset" pins of the motherboard, on which the ground is permanently present, which is connected via connector J8 to pin 4 of J10 on the Fan-Controller Card and then goes to pin 4 of the Frontpanel connector. You just need to swap the 2 pins in the connector that is connected to the "reset" group on the motherboard.

Good luck.

Converter:
Hello everyone. Has anyone had success with directly connecting the NEC NL10276BC20-04 LCD to the onboard lvds port of the Advantech AIMB-582 motherboard? I made a correct BIOS setting for a 1024x768 18bit matrix, but the image is always strongly stretched horizontally. I suppose that the compatibility problem is in that part of the BIOS firmware of the motherboard, which is responsible for the output of lvds signals. With other ports, like D-Sub, this works fine (with a separate discrete scaler board). Can someone have another BIOS version compatible with NL10276BC20-04?

The DP to LVDS CH7511B-BF converter firmware is contained in the 24C64 EEPROM (I²C) located on the back of the motherboard. I need a workable version of the dump, which can be read using the programmer, or Chrontel CH7511B Utility.
In this thread, user Ollopa mentioned that he is using an AIMB-581 and NEC NL10276BC20-04 LCD motherboard. Did you manage to get the correct display in this project?

Converter:
Advantech's office asked for $500 for optimizing the firmware for the LCD matrix NL10276BC20-04. To do this, they ask to send them to Taiwan my matrix, motherboard and all connecting cables.

However, I was able to successfully modify the firmware myself.
For this I used the Chrontel CH7511B Utility, and some instructions on how to use them, which were not easy to obtain.

The task is quite simple, it was enough for me to correct only 2 DTD parameters: HB (Hor. Blanking) and VB (Ver. Blanking), which are calculated using the factory specifications of the LCD matrix presented in

Datasheet according to the formula : HB = Hsync Period - Hsync Active; VB = Vsync Period - Vsync Active. And also the clock frequency (DCLK) has been slightly adjusted and the size of the visible area.

Thus, the LCD matrix now works perfectly. As you can see in the attached photos, now the image scaling occurs correctly, both in DOS mode and after loading Windows.

Perhaps it will be useful to someone else in the future, so I am attaching to the letter my firmware optimized for the NL10276BC20-04 matrix (Lec1.bin): https://drive.google.com/file/d/1pVnBnOJF5OahTJMiuA6iCdQS9HPOywiH/view?usp=sharing

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