3.5 Inch TFT touch LCD won't light up.

Hello all,

I have tried to search for similar problem on the forum and elsewhere, but came up short. Please redirect me if you know of anything of interest.

The problem:
I bought this LCD: 2.8 inch/3.5 inch tft colorful hd lcd display module with sensor touch 320x240 480x320 Sale - Banggood.com-arrival notice-arrival notice

Crap LCD, i know.
The thing is that i can't get it to ligt up, the screen won't start. No backlight or anything?

This is the pins:
Pins

This is my connections:
5v--->5v
GND--->GND
VDD--->3.3v
VDD--->3.3v
GND--->GND

I have checked that the PSU's give me 5v and 3.3v, no problem.
I have tested a different 3.5 inch screen that is without touch and it lights up without any problems.

What am I missing?
How can I test further?

If you guys need more information, please let me know.

Thank you all in advance,
Michael

Your screen needs a BL signal for the backlight.

All logic signals must be 3.3V.
If you want to use a 5V MEGA2560 you need about 24 level shifters.

As far as I know, there are no 34-pin Adapter shields.
However there are plenty of 40-pin Adapter shields with level shifters. You just need to route all your 34-pins to the corresponding 40-pins on the Adapter.

David.

BL ffs! how could i miss that :o
Thank you David!

I got the routing for the Mega bord set up i was just missing the light. Thanks again mister :slight_smile:

I hope you are routeing to a 40-pin MEGA Adapter.

Life is much easier with a 3.3V Due. One Protoshield to receive 34-pin and the job is done.

David.