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VGA signal drops upon booting to Dreamshell - Версия для печати

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+--- Тема: VGA signal drops upon booting to Dreamshell (/thread-3551.html)

VGA signal drops upon booting to Dreamshell - Mu. - 27.03.2019 18:05

As the title says, when I use my new VGA cable with my monitor or TV via a VGA -> HDMI adapter I'll get past the bios just fine but as soon as I see the Dreamshell logo (or even before then) the video signal will drop out.

I'm not sure what I've done wrong since I was previously able to use my cable with a VGA monitor just fine for several days. It wasn't until recently that this started happening.

I've copied over a fresh install of DS and that hasn't solved the issue, I'm unsure of what else I can do.

RE: VGA signal drops upon booting to Dreamshell - aldair - 27.03.2019 18:24

The VGA of the aliexpress does not have the pimos 5 and 10 with gnd, causing noises in the sound. Because of this may not work on today's TVs.

RE: VGA signal drops upon booting to Dreamshell - Mu. - 27.03.2019 18:34

(27.03.2019 18:24)aldair писал(а):  Pins 6 and 7 have no gnd.

On the VGA port, or on the console's AV out?

RE: VGA signal drops upon booting to Dreamshell - aldair - 27.03.2019 18:46

It may be the defective temperature fan or chip.
Your VGA cable is working perfectly. The chip that was removed in the video below, it checks if the fan is connected or working. But with time it shows this defect it cuts off 3.3 volts of CPU and GPU.




RE: VGA signal drops upon booting to Dreamshell - megavolt85 - 27.03.2019 19:20

china VGA cable don't have three capacitor, not all VGA -> HDMI can work without capacitors
few VGA -> HDMI don't support not standart video signal

RE: VGA signal drops upon booting to Dreamshell - aldair - 27.03.2019 19:26

(27.03.2019 19:20)megavolt85 писал(а):  china VGA cable don't have three capacitor, not all VGA -> HDMI can work without capacitors
few VGA -> HDMI don't support not standart video signal

But it showed the startup bios of Dreamshell in the VGA.

RE: VGA signal drops upon booting to Dreamshell - megavolt85 - 27.03.2019 19:32

VGA -> HDMI can lose synchronization not at once

RE: VGA signal drops upon booting to Dreamshell - Mu. - 27.03.2019 19:47

(27.03.2019 19:20)megavolt85 писал(а):  china VGA cable don't have three capacitor, not all VGA -> HDMI can work without capacitors
few VGA -> HDMI don't support not standart video signal

You're right, I opened up the cable and found it only had resistors instead of capacitors. I'll probably just buy a Gekko or something and forget about this lol!Big Grin

RE: VGA signal drops upon booting to Dreamshell - aldair - 27.03.2019 19:51

(27.03.2019 19:47)Mu. писал(а):  
(27.03.2019 19:20)megavolt85 писал(а):  china VGA cable don't have three capacitor, not all VGA -> HDMI can work without capacitors
few VGA -> HDMI don't support not standart video signal

You're right, I opened up the cable and found it only had resistors instead of capacitors. I'll probably just buy a Gekko or something and forget about this lol!Big Grin

With composite video cable does Dreamcast work normal?

RE: VGA signal drops upon booting to Dreamshell - Mu. - 27.03.2019 20:22

(27.03.2019 19:51)aldair писал(а):  With composite video cable does Dreamcast work normal?

Yes, with composite cables the Dreamcast displays just fine. I'm certain the VGA cable is at fault here.

RE: VGA signal drops upon booting to Dreamshell - Mu. - 01.04.2019 16:04

I'm not sure what caused this issue to start with, but after tearing down the console and putting everything back together the signal dropping stopped.

If this happens to anyone else, it may be as simple as that.

RE: VGA signal drops upon booting to Dreamshell - aldair - 01.04.2019 16:46

(27.03.2019 19:20)megavolt85 писал(а):  china VGA cable don't have three capacitor, not all VGA -> HDMI can work without capacitors
few VGA -> HDMI don't support not standart video signal

I do not use capacitors. Tested on many converters and works 100%!
But you need a 150ohm resistor on Hsync for other monitors.

[Изображение: SLPVXW3m.jpg]

RE: VGA signal drops upon booting to Dreamshell - megavolt85 - 01.04.2019 17:13

(01.04.2019 16:46)aldair писал(а):  Tested on many converters and works 100%!

Not all converters and TV work without capacitors