Black screen using HDMI2VGA

[xphere]

Hi all,
I'm using one HDMI2VGA converter (a standard model from a known Chinese shop), but I cannot make it work...
I've tried the converter with a laptop and it works, so I discard that the converter has any defect.

Then, I've tried all possibe config.txt combinations... but I always get black screen in the TFT... the options that I've modified are:

#for forcing VGA mode to 640x480-60Hz: 
hdmi_group=2
hdmi_mode=4

#for enabling HDMI
hdmi_safe=1

#comment to get jack audio (i've read that in some converters this is required, despite my
#converter has no audio output)... I've tried commenting, setting it to '1' and '2'... no luck!
hdmi_drive=2

#I've tried with 0 (default) and 4 (which is supposed to give more "power" to the TFT)
config_hdmi_boost=4

hdmi_force_hotplug=1

Any other Idea? I am missing any configuration parameter?

Anyone that has a HDMI2VGA converter working, could please post the config.txt file?

Thanks a lot!!!!

[paradadf]

@xphere I recommend you to test the same adapter with a laptop and that screen. I bought one that only worked with the output of my little camera, but couldn't handle higher resolutions, so it was useless.

[xphere]

Hi paradadf! Thanks for replying!
Yes, I've tried with the laptop and the same TFT screen that I've used with the raspberry, and I've been able to set up a resolution up to 1680x1050 (60Hz) (the maximum supported by the TFT), so I assume that the TFT is also working...
I have even tried with the "hdmi_ignore_edid" option, to ignore edid info, but still same results...

hdmi_ignore_edid=0xa5000080

[paradadf]

@xphere I don't know, but @ian57 probably does!

[Substring]

@xphere not even noobs displays anything ?

[xphere]

I've tried all possible options and none seems to work... Even noobs is not displaying anything...

it's strange because I've seen on forums and youtube videos that my adapter works on rpi! but none of the options worked for me.

[idarius]

hi, here is my config for 240p on my crt with hdmi => vga :

hdmi_ignore_edid=0xa5000080
hdmi_pixel_encoding=2
avoid_safe_mode=1
disable_overscan=1
config_hdmi_boost=4
hdmi_force_hotplug=1
hdmi_drive=2
hdmi_group=1
hdmi_mode=6
hdmi_force=1
kernel=zImage
hdmi_force_hotplug=1
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512
avoid_safe_mode=1
disable_splash=1
dtparam=audio=on

[xphere]

@idarius thanks for the reply! I will try that configuration! eventhough, it sounds strange to me that you have tried the CEA mode:

# this is for HDMI_CEA_480i60
hdmi_group=1
hdmi_mode=6

If you are using a VGA monitor, should not be better to use a DMT mode?

# this is for HDMI_DMT_VGA_60 (640x480)
hdmi_group=2
hdmi_mode=4

[xphere]

@idarius by the way... what does this parameter in your config do?

hdmi_force=1

I've not found any documentation related, probably you mean "hdmi_force_hotplug=1"? (you already have this parameter repeated twice in your config)

Thanks!

[idarius]

yeah i think it's a mistake for the hdmi force 1, i seen it on some forum.
For the hdmi mode 6 group 1, its because on a crt i need 480 i. talked about crt tv, not crt pc screen, so resolution is 240p max or 480interlaced.
my games run in 240p (320 x 240), but EmulationStation is unreadable with this resolution, so ==> 480i

[xphere]

@idarius Thanks for the explanation.
I've tried your code but... no luck! I'm always getting no signal on my TFT (LG 19inch L1953S-SF).

[xphere]

I have found the solution!!!!!!!!!!!!!!!!
The problem was not in the converter, neither in the configuration!
The problem was due to this!!! the fu**ing hdmi wall mount that I have in the box that contains the rpi was cutting the VGA signal, so I tried to connect the HDMI2VGA adapter directly to the rpi, instead of the wall mount and... voilá! works perfectly!!!! even detects automatically the resolution!!!!

so.. conclusion: DO NOT USE ANY CABLE BETWEEN THE HDMI OUTPUT AND THE HDMI2VGA CONVERTER!!!!!!

[idarius]

hehe cool for you, pretty weird