Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Wed Oct 11, 2017 2:54 am

I do not understand how to enter these teams in Raspberrypi(

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Thu Oct 12, 2017 3:14 pm

I added text to the Config file.
I put the screen on top and he still does not work (

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saper_2
Posts: 215
Joined: Sun Aug 03, 2014 10:08 am
Location: PL

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Thu Oct 12, 2017 6:08 pm

Hi,

Check if your display works at all: take the display (if u have it connected to RPi then disconnect from Pi), connect to display only power via microusb , toggle switch to see if it will lit up at all - Working display without RRi (nor connected signal to HDMI) should be blue (it might show up "no signal" and/or KeDei logo - see photos (and my movie - I don't remember if I have one :) )).

When U confirm it power up ok, then connect signal via HDMI to it, e.g. from computer (and don't forget to enable external(2nd) display in your computer.. :shock: ) - just to test it if the display work ok.

Now, connect it to RPi and don;t forget about the hdmi connector board 8-) , connect to RPi LAN (,usb mouse, keyboard if u need), and connect the microusb power not to the Pi but to the display. Pi should bootup - if u have already enabled (added if not exists) and set config values in config.txt then u should see picture - notice: don't config touch for now, just setup only display to see if it works. If u have working display then start playing with touch... and there is end of my help - I don't have touch in my display :lol:

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Fri Oct 13, 2017 6:00 am

The display is working.
The lights are blue and the inscription Kedey.
I put it on Malinka, connected it to an HDMI bridge.
In the config file, the text inserted above.
Through remote access the system works, but the screen does not (

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saper_2
Posts: 215
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Location: PL

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sat Oct 14, 2017 1:03 pm

I don't know what u're doing wrong....

The display (my at least) work out of box (well it's not very readable) but at least I can see if it works:
disp-working-after-first-boot.jpg
disp-working-after-first-boot.jpg (31.59 KiB) Viewed 790 times
Here is a full my config file, I tested it on latest rapsbian 2017-09-07-raspbian-stretch.img :

Code: Select all

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# Force use HDMI
hdmi_force_hotplug=1
# force a specific HDMI mode
hdmi_group=2
hdmi_mode=87

# custom display resolution (480x320 looks good , and 720x480 is not too bad too,3rd res is: 810x540 )
#         /----------------- Width: 480px ( or 720px /or 810px)
#         |   /------------- Height: 320px ( or 480px /or 540px)
#         |   |   /--------- Refresh: 60Hz
#         |   |   | /------- Aspect ratio: 6=15:9 (1=4:3, 2=14:9, 3=16:9, 4=5:4, 5=16:10)
#         |   |   | | /----- Margins: 0=disabled (1=enabled)
#         |   |   | | | /--- Interlace: 0=progressive (1=interlaced)
#         |   |   | | | | /- Reduced blanking: 0=normal (1=reduced)
#         |   |   | | | | |
hdmi_cvt 480 320 60 6 0 0 0

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
Also here is 2 photos how deep the hdmi bridge should go into hdmi connectors (I marked a black line on the plugs how deep it must go):
disp-plug2.jpg
disp-plug2.jpg (25.33 KiB) Viewed 790 times
disp-plug1.jpg
disp-plug1.jpg (16.76 KiB) Viewed 790 times

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sun Oct 15, 2017 10:10 am

Do I need to replace the entire configuration file?
Or below to add your code?

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sun Oct 15, 2017 10:26 am

Friend, here's the video: https://www.youtube.com/watch?v=yVk9u0f31I4
The screen shows, but very badly.
Then goes out and all.

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saper_2
Posts: 215
Joined: Sun Aug 03, 2014 10:08 am
Location: PL

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sun Oct 15, 2017 10:39 am

Hi,

Krot wrote:
Sun Oct 15, 2017 10:26 am
Friend, here's the video: https://www.youtube.com/watch?v=yVk9u0f31I4
The screen shows, but very badly.
Then goes out and all.
Answer in points:
1. And connect the POWER to THE DISPLAY BOARD not the raspberry board - how it works now?
2. What kernel you are using - stock=original , or kedei (this one is old and may not work)...
3. Install clean latest raspbian on sdcard - don't config anything (except ssh if you want), and see if you'll see desktop on display.

For now, with info that you provided: this looks like the display is bad or the connection to the display (from the HDMI chip to the display panel itself) at lest.

Krot wrote:
Sun Oct 15, 2017 10:10 am
Do I need to replace the entire configuration file?
Or below to add your code?
This is WHOLE file - config only is for fixing the high resolution to display native resolution (480x320px), not for touch.


This is about end of my abilities to help you remotely. Your best option would be just find some IT (or somebody who have knowledge about electronics and/or embedded computers/single board computers (SBC) like RPi) who would test your display at least.

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sun Oct 15, 2017 12:07 pm

After feeding power through the screen, the emblem flashed and again the screen went out (
It is worth this version of the kernel: 2017-07-05-raspbian-jessie, 4.34 Gb

Krot
Posts: 9
Joined: Sun Oct 08, 2017 3:08 pm

Re: [Review] KeDei 3.5" HDMI display with touch for Raspberry Pi

Sat Oct 21, 2017 1:19 pm

And how do I specify a link to the driver in the command line.
That they can be downloaded from the site of KeDei, maybe it will work.

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