[Solved] Another screen problem :(

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correia5022
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Re: Another screen problem :(

Post by correia5022 » Mon Jan 21, 2019 3:55 pm

Mike9490 wrote:
Mon Jan 21, 2019 1:36 pm
I try but i can't find any 5v near the 10V cap ( just a 3.3V on the pin of that capacitor)..... :(
Damn, i was really convinced it would work..
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Re: Another screen problem :(

Post by correia5022 » Mon Jan 21, 2019 3:58 pm

Can you take a better photo as each chip?
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Re: Another screen problem :(

Post by Mike9490 » Thu Jan 24, 2019 7:03 am

correia5022 wrote:
Mon Jan 21, 2019 3:58 pm
Can you take a better photo as each chip?
Here the photo.. i don't think i can do better :o

Image

Image

Image

Image

Image

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Re: Another screen problem :(

Post by McGyver » Thu Jan 24, 2019 7:18 am

Maybe stop to focus on 5.0V, maybe your screen runs on 3.3 Volts as you already measured on the cap.
If it runs on 3.3V and the power consumption is not too hight you can resolve this voltage from the raspberry GPIO pins somewhere. Just google the GPIO pinout and try. Keep the drawn amperage in mind in case this does not work together with the PI...

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Re: Another screen problem :(

Post by Mike9490 » Thu Jan 24, 2019 8:11 am

McGyver wrote:
Thu Jan 24, 2019 7:18 am
Maybe stop to focus on 5.0V, maybe your screen runs on 3.3 Volts as you already measured on the cap.
If it runs on 3.3V and the power consumption is not too hight you can resolve this voltage from the raspberry GPIO pins somewhere. Just google the GPIO pinout and try. Keep the drawn amperage in mind in case this does not work together with the PI...
I was thinking the same, but i try on another similar display (4.3'' with similar board, i read the 3.3V with multimeter) and.... now it's burned.
That's why i ask here, i don't want to buy the 3rd display XD

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Re: Another screen problem :(

Post by correia5022 » Thu Jan 24, 2019 1:01 pm

have you unsticked that controller board from the screen?
Please do that. I have a similar board that has 5v and GND pads on the bottom of the pcb...
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Re: Another screen problem :(

Post by correia5022 » Thu Jan 24, 2019 1:15 pm

Also, i think that GBAAC chip is the solution, because seeing the traces coming from 12v, goes through a Schottky diode, then an inductor then i think the cap and then that chip.
SO, please measure the voltage across GND and the 1st pin of the right side of GBAAC (oposite side of that little stop)
(the pin that goes again to another inductor and 10v cap)
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Re: Another screen problem :(

Post by Mike9490 » Fri Jan 25, 2019 4:40 am

correia5022 wrote:
Thu Jan 24, 2019 1:15 pm
Also, i think that GBAAC chip is the solution, because seeing the traces coming from 12v, goes through a Schottky diode, then an inductor then i think the cap and then that chip.
SO, please measure the voltage across GND and the 1st pin of the right side of GBAAC (oposite side of that little stop)
(the pin that goes again to another inductor and 10v cap)
Here the voltage of all Pin in GBAAC chip

Image

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Re: Another screen problem :(

Post by Mike9490 » Fri Jan 25, 2019 4:54 am

correia5022 wrote:
Thu Jan 24, 2019 1:01 pm
have you unsticked that controller board from the screen?
Please do that. I have a similar board that has 5v and GND pads on the bottom of the pcb...
On the bottom of the pcb:
Image

I think i'll try to use the 3.3V on the VCC33 pin... (i have to find something that give 3.3V first :x :x :x ).

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Re: Another screen problem :(

Post by McGyver » Fri Jan 25, 2019 6:13 am

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

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