Hello,
I have the problem with the white screen and the led is no blink.
I push the Reset, and there is no blink.
I think I have a problem with the oscillo (OSC signal), the voltage is too low.
I have remplaced the Y1, C12 and C13 and there is the same problem.
Here is the schematic with the mesured voltage.
How can I solve that? Thanks
White screen, no blink
Re: White screen, no blink
did you plug USB in?
hint I didn't!!
~:"
hint I didn't!!
~:"
-
- Posts: 4
- Joined: Wed Dec 09, 2015 5:10 pm
Re: White screen, no blink
Hello,
I tryed with the usb not plugged, and with it plugged.
No change, windows don't reconize the DSO (I have read it's normal, the usb is not programmed in the DSO software).
I tryed with the usb not plugged, and with it plugged.
No change, windows don't reconize the DSO (I have read it's normal, the usb is not programmed in the DSO software).
Re: White screen, no blink
Looks the MCU didn't run. Did you have JP4 closed? If yes did you see LED blinked when you press RESET button?
-
- Posts: 4
- Joined: Wed Dec 09, 2015 5:10 pm
Re: White screen, no blink
Yes, of course, JP4 is closed and i have the 3,3V on the pin near the MCU on C18.
Non, the led not blink and is correctly soldered.
I alway have 3,17V on the pin of R28 near the led. And when I press the Reset, there is NO change.
Non, the led not blink and is correctly soldered.
I alway have 3,17V on the pin of R28 near the led. And when I press the Reset, there is NO change.
Re: White screen, no blink
I have the same problem.
I have the problem with the white screen and the led is no blink.
Any ideas?
I bought it from ebay from this saller : tomtop_game
I have the problem with the white screen and the led is no blink.
Any ideas?
I bought it from ebay from this saller : tomtop_game
Re: White screen, no blink
did you plug USB in?
hint I didn't!!
~:"
hint I didn't!!
~:"
Re: White screen, no blink
I found the cause of the white screen and the lack of -5.0v at me.
For me it was L4 100 uH not working properly.
After the change with what i have on hand a foot 9 on STM32F103C8 appeared 3.3v , and DSO138 work.
I hope I've been helpful to someone.
Happy Holidays....
For me it was L4 100 uH not working properly.
After the change with what i have on hand a foot 9 on STM32F103C8 appeared 3.3v , and DSO138 work.
I hope I've been helpful to someone.
Happy Holidays....
-
- Posts: 4
- Joined: Wed Dec 09, 2015 5:10 pm
Re: White screen, no blink
Ok, thanks,
I will check that.
UPDATE:
I mesure the resistance of L1 and L3, it's about 4,5 ohms. The value of L4 is incorrect.
I changed the L4, and it's working good!
Thanks karolev!
I will check that.
UPDATE:
I mesure the resistance of L1 and L3, it's about 4,5 ohms. The value of L4 is incorrect.
I changed the L4, and it's working good!
Thanks karolev!