VU7A+ - Multiple Questions

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FntX
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VU7A+ - Multiple Questions

Unread post by FntX » Sat Jun 15, 2019 5:46 pm

Now that I can finally hold it in my hands it quickly raised some questions :)

1) When the display has no signal it displays "no signal". Is there a possibility to circumvent that?
2) Is there a way to hook onto the brightness control so I can control it externally?

//EDIT: Made a Mistake. I own the VU7A+
Last edited by FntX on Sun Jun 16, 2019 4:39 pm, edited 1 time in total.

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Re: VU7+ - Multiple Questions

Unread post by mad_ady » Sat Jun 15, 2019 6:13 pm

For #2 - search odroid magazine or the wiki - if you solder a resistor in some spot you can connect it to a pwm signal that can drive brightness control.
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Re: VU7A+ - Multiple Questions

Unread post by odroid » Mon Jun 17, 2019 1:29 pm

There is no way to disable OSD feature of the Vu7A+ unfortunately.

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Re: VU7A+ - Multiple Questions

Unread post by FntX » Mon Jun 17, 2019 5:27 pm

Unfortunately I wasn't able to locate the right chip on the board to regulate the brightness. It's somewhat different than on the Vu7. There is a 4103 Chip but this one has no PWM input for brightness control.

I hooked into the power button of the display so I am able to turn it off when the Odroid is in a sleep state. When the Odroid is coming up again, the display will turn on again by itself. I planned to remove the button completely but that would've been stupid :)
That display button works via a pulldown mechanism. It simply shorts the pin to ground. I'm now using an opto isolator, with 470R resistor in front as a safety measurement, via my external power management arduino. That does the trick because I want to drive the whole setup as power efficient as possible.
Last edited by FntX on Mon Jun 17, 2019 5:33 pm, edited 1 time in total.

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Re: VU7A+ - Multiple Questions

Unread post by odroid » Mon Jun 17, 2019 5:31 pm


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Re: VU7A+ - Multiple Questions

Unread post by FntX » Mon Jun 17, 2019 5:42 pm

odroid wrote:
Mon Jun 17, 2019 5:31 pm
Did you see this wiki page?
https://wiki.odroid.com/accessory/displ ... th_android
Thanks, yes - but I want to use my cars light level sensors to dim the display.

I was mildly confused while looking at the datasheet but this one is the right chip on the Vu7a+:

Image

The red area is the lane to the EN pin #4 and can be controlled like on the Vu7. A truly HUGE area to solder on for people like me without SMD soldering skills :)

I'll try this out...

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