[Solved] Another screen problem :(

[correia5022]

Here the voltage of all Pin in GBAAC chip

Damn... cant think of anything else but to use a step-up board to 12v...

[Mike9490]

The raspberry itself gives 3.3 out of one of its GPIO pins. Just google the pinout. Maybe the power consumption of the screen is too high for this output. Do you have power values measured from your screen to compare with the pi 3.3 output specs maybe before trying?

See this link about raspberry pi 3.3V rail:

https://www.element14.com/community/thr ... hread=true

I saw with my multimeter that the display absorbs 90mA.
The 3.3V pin on raspberry can give 50mA and over that value you can burn the board
I'll try with some generator to give 3.3volt to that display and hope that it will work with that voltage.
If it works with 3.3 volt, i need to reduce my 5v power supply to 3.3v.

[Mike9490]

Here the voltage of all Pin in GBAAC chip

Damn... cant think of anything else but to use a step-up board to 12v...

Good news for me, the display works with 3.3V and 300 mAh
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?

[correia5022]

Good news for me, the display works with 3.3V and 300 mAh
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?

You dont need the converter. The RPi0 has a 3.3v pin, just wire it there.
As for screen adjustments, did your's came with a separate board with controls? (3 tactile switches) I boosted mine with 70 brightness, 70 contrast and 60 saturation. It betters the quality, but still hard to read.
Just install the GBZ35 theme and it will be much better.
(i usually make my configs in a hdmi monitor beforehand)

[Mike9490]

Good news for me, the display works with 3.3V and 300 mAh
So now i have 5V battery and i need to convert it to 3.3V, maybe using a lm3940 (if you know some other way, i'm ready to hear it )
The definition si very low (i can't even read the boot words and it's unreadable when i write some command) but it's the same when i use 12v, so the display is not so good.
Do you know some setting to make the display look better?

You dont need the converter. The RPi0 has a 3.3v pin, just wire it there.
As for screen adjustments, did your's came with a separate board with controls? (3 tactile switches) I boosted mine with 70 brightness, 70 contrast and 60 saturation. It betters the quality, but still hard to read.
Just install the GBZ35 theme and it will be much better.
(i usually make my configs in a hdmi monitor beforehand)

Yes, my screen contro board has the separate board with the 3 switches, i'll try to use it.
The problem is the 3.3V pin on the raspberry Pi Zero: i have read that the maximum permitted current draw from the 3.3 V pin is 50 mA and i need 300mA...
I don't think that the 3.3V pin can turn on the display ( and I'm afraid of burning my RPi0 ) ...

[correia5022]

Yes, my screen contro board has the separate board with the 3 switches, i'll try to use it.
The problem is the 3.3V pin on the raspberry Pi Zero: i have read that the maximum permitted current draw from the 3.3 V pin is 50 mA and i need 300mA...
I don't think that the 3.3V pin can turn on the display ( and I'm afraid of burning my RPi0 ) ...

Oh, yeah you are right about that 3.3v pin.
Use a linear regulator, like 3.3V 800mA Linear Voltage Regulator - LD1117-3.3 TO-220
https://www.adafruit.com/product/2165
or a LM3940
http://www.ti.com/product/LM3940#

[xaphor]

Sorry to bump this but I've just got one of these today (From amazon)

How did you wire it? (I'm a newbie to this) If you could send photos I'd appreciate it

[adriano_scorpions]

Sorry to bump this but I've just got one of these today (From amazon)

How did you wire it? (I'm a newbie to this) If you could send photos I'd appreciate it

Got? I have this same card, and I need to connect to 5v